Management Software ® AT-S39 ◆ User’s Guide FOR THE AT-8024, AT-8024GB, AND AT-8026FC FAST ETHERNET SWITCHES VERSION 1.
Copyright 2002 Allied Telesyn, Inc. 960 Stewart Drive Suite B, Sunnyvale, CA 94085 USA All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn, Inc. Microsoft is a registered trademark of Microsoft Corporation, Netscape Navigator is a registered trademark of Netscape Communications Corporation.
Table of Contents List of Figures ........................................................................................................................................................................................................ 8 Preface ....................................................................................................................................................................................................................10 How This Guide is Organized .......................
Table of Contents Chapter 3 Basic Switch Parameters ................................................................................................................................................................................ 31 When Does a Switch Need an IP Address? ................................................................................................................................................. 32 How Do You Assign an IP Address?...........................................................
Chapter 10 Virtual LANs ..........................................................................................................................................................................................................90 VLAN Overview .....................................................................................................................................................................................................91 Port-based VLAN Overview ............................................
Table of Contents Chapter 16 Management Software Updates ..............................................................................................................................................................163 Obtaining Software Updates .........................................................................................................................................................................164 Downloading New Management Software from a Local Management Session ........................
Chapter 25 MAC Address Table ........................................................................................................................................................................................ 222 Viewing the MAC Address Table ................................................................................................................................................................. 223 Adding Static MAC Addresses ......................................................................
List of Figures Figure 1: Connecting a Terminal or PC to the RS232 Terminal Port ................................................................................................. 25 Figure 2: Main Menu .......................................................................................................................................................................................... 26 Figure 3: Administration Menu .........................................................................................
Figure 38: MAC Address Table Menu ........................................................................................................................................................ Figure 39: Show All MAC Addresses Window ........................................................................................................................................ Figure 40: IGMP Snooping Configuration Window .....................................................................................................
Preface This guide contains instructions on how configure an AT-8024, AT-8024GB or AT-8026FC Fast Ethernet Switch using the AT-S39 management software. How This Guide is Organized This manual is divided into three sections. Section I: Overview This section contains just one chapter. It reviews the different ways that you can access the AT-S39 management software on a switch.
AT-S39 User’s Guide Document Conventions This document uses the following conventions: Note Notes provide additional information. Warning Warnings inform you that performing or omitting a specific action may result in bodily injury. Caution Cautions inform you that performing or omitting a specific action may result in equipment damage or loss of data.
Preface Where to Find Web-based Guides The installation and user guides for all Allied Telesyn products are available in Portable Document Format (PDF) from on our web site at www.alliedtelesyn.com. You can view the documents on-line or download them onto a local workstation or server.
AT-S39 User’s Guide Contacting Allied Telesyn To contact Technical Support by phone, find your country or region in the table below.
Preface Management Software Updates New releases of our management software programs for our managed products can be downloaded from our web site at www.alliedtelesyn.com or our FTP server at ftp.alliedtelesyn.com. To use the FTP server, enter ‘anonymous’ for the user name when you log in and your e-mail address for the password.
Section I Overview The chapter in this section provides a brief overview of the AT-S39 management software. It explains some of the functions that you can perform with the management software and reviews the different methods for accessing the AT-S39 software on an AT-8024, AT-8024GB or AT-8026FC Fast Ethernet Switch.
Chapter 1 Overview The AT-S39 management software is intended for the AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches. The software is used to monitor or adjust a switch’s operating parameters.
AT-S39 User’s Guide To actively manage a switch, such as to change or adjust its operating parameters, you must access the switch’s AT-S39 management software. The AT-S39 software has a menu interface that makes it very easy to use, and a special interface for managing a switch with a web browser. There are four different ways that you can access the management software on an AT-8024, AT-8024GB. or AT-8026FC Fast Ethernet Switch. The methods are referred to as management sessions in this guide.
Section I: Overview Local Management Session You establish a local management session with an AT-8024, AT-8024GB, or ATY-8026FC Fast Ethernet Switch by connecting a terminal or a PC with a terminal emulator program to the RS232 Terminal port on the front panel of the switch, using a straight-through RS-232 cable. This type of management session is referred to as “local” because you must be physically close to the switch, such as in the wiring closet where the switch is located.
AT-S39 User’s Guide Telnet Management Session Any management workstation on your network that has the Telnet application protocol can be used to manage an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch. This type of management session is referred to in this guide as a remote management session because you can manage the switch from any network workstation that has the application protocol.
Section I: Overview Web Browser Management Session You can also use a web browser to manage a switch. This too is a type of remote management, just like a Telnet management session, because you can manage a switch from any workstation on your network that has a web browser. There are some management functions that you cannot perform from a a web browser management session. They are: ❑ Enhanced stacking - You cannot use the enhanced stacking feature from a web browser management session.
AT-S39 User’s Guide SNMP Management Session Another way to remotely manage the switch is with an SNMP management program. A familiarity with Management Information Base (MIB) objects is necessary to manage a switch with an SNMP management program.
Section II Local and Telnet Management The chapters in this section explain how to manage an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch from a local or Telnet management session.
Chapter 2 Starting a Local or Telnet Management Session This chapter contains the procedure for starting a local or Telnet management session on an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch.
Section II: Local or Telnet Management Local Management Session On the front panel of the switch is a port labelled RS232 Terminal Port. You use this port to establish a local management session with the switch’s AT-S39 management software. A local management session is so named because you must be close to the switch, usually within a few meters, to start this type of management session. This typically means that you must be in the wiring closet where the switch is located.
AT-S39 User’s Guide Starting a Local Management Session To start a local management session, perform the following procedure: 1. Connect one end of a straight-through RS232 cable with a DB-9 connector to the RS232 Terminal Port on the switch. POR TB RS- DE 232 LINK MOD E TER MIN AL P ORT FAU LT MAS TER PWR Figure 1 Connecting a Terminal or PC to the RS232 Terminal Port 2. Connect the other end of the cable to an RS-232 port on a terminal or PC with a terminal emulator program. 3.
Section II: Local or Telnet Management Note The switch has an auto-detect feature that automatically determines the speed of the terminal. You use this feature by pressing any key on your keyboard within five seconds after powering on or resetting the switch. The switch responds by determining the speed of the terminal and automatically configuring the speed of the RS232 Terminal Port accordingly. Otherwise, the switch uses a default baud rate of 9600 bits per second (bps).
AT-S39 User’s Guide To select a menu item, type the corresponding letter or number. Pressing the Esc key from a submenu or window returns you to the previous menu. Enhanced Stacking When you start a local management session on a switch that has been designated as the Master switch of an enhanced stack, you can manage all the switches in the same subnet from the same management session.
Section II: Local or Telnet Management Quitting from a Local Session To quit a local session, return to the Main Menu and type Q for Quit. You should always exit from a management session when you are finished managing a switch. This can prevent unauthorized individuals from making changes to a switch’s configuration should you leave your management station unattended. Note You cannot operate both a local management session and a Telnet management session on the same switch simultaneously.
AT-S39 User’s Guide Telnet Management Session You can use the Telnet application protocol from a workstation on your network to manage an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch. This type of management is referred to as remote management because you do not have to be physically close to the switch to start the session, such as with a local management session. Any workstation on your network that has the application protocol can be used to manage the switch.
Section II: Local or Telnet Management Quitting from a Telnet Management Session To end a Telnet management session, return to the Main Menu and type Q for Quit.
Chapter 3 Basic Switch Parameters This chapter contains a variety of information and procedures. There is a discussion on when to assign an IP address to a switch and the different ways that you can go about it. There are also procedures for resetting the switch, activating the original switch default settings, and more.
Section II: Local and Telnet Management When Does a Switch Need an IP Address? One of the tasks to building or expanding a network is deciding which of the managed switches need to be assigned a unique IP address. The rule used to be that a managed switch needed an IP address if you wanted to manage it remotely, such as with the Telnet application protocol. However, if a network contained a lot of managed switches, having to assign each one an IP address was often cumbersome and time consuming.
AT-S39 User’s Guide If you do not plan to remotely manage any of the AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches in your network, then you do not need to assign any of them an IP address. The switches will operate fine without an IP address and you will still be able to manage them completely using local management sessions.
Section II: Local and Telnet Management Configuring an IP Address and Switch Name The procedure in this section explains how to manually assign an IP address, subnet mask, and gateway address to the switch from a local or Telnet management session. (If you want the switch to obtain its IP configuration from a DHCP or BOOTP server on your network, go to the procedure Activating the BOOTP and DHCP Services on page 37.
AT-S39 User’s Guide 2. Change the parameters as desired. The parameters in the IP Parameters window are described below: 1 - IP address This parameter specifies the IP address of the switch. You must specify an IP address if you intend to remotely manage the switch using a web browser, a Telnet utility, or an SNMP management program, or if you want an AT-8024GB switch to function as the Master switch of an enhanced stack. 2 - Subnet mask This parameter specifies the subnet mask for the switch.
Section II: Local and Telnet Management Caution Do not include spaces or special characters, such as asterisks (*) or exclamation points (!), in a password. This is particularly important if you will be managing the switch from a web browser, because most web browsers cannot handle special characters in passwords.
AT-S39 User’s Guide Activating the BOOTP and DHCP Services The BOOTP and DHCP application protocols were developed to simplify network management. They are used to automatically assign IP configuration information to the devices on your network, such as an IP address, subnet mask, and a default gateway address. The AT-8024 and AT-8024GB Fast Ethernet Switches support these protocols and can obtain their IP configuration information from a BOOTP or DHCP server on your network.
Section II: Local and Telnet Management The System Configuration Menu in Figure 4 is displayed. Allied Telesyn AT-8024 Ethernet Switch System Config Menu 1 2 3 4 5 6 - MAC Aging Time ................... Switch Mode ...................... Console Discount Timer Interval .. BOOTP/DHCP........................ Web Server Status ................ SNMP Access ......................
AT-S39 User’s Guide Configuring SNMP Community Strings and Trap IP Addresses To configure the SNMP community strings for the switch and to assign up to four IP addresses of management stations to receive traps from the switch, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2. From the System Configuration Menu, type 7 to select Advanced Configuration. The Advanced Configuration window in Figure 5 is displayed.
Section II: Local and Telnet Management 4. Adjust the parameters as desired. To change a value, type its corresponding number and, when prompted, enter the new value. The parameters are described below. 1 - GET Community 2 - SET Community 3- Trap Community Use these parameters to set a switch’s SNMP community strings.
AT-S39 User’s Guide Activating the AT-S39 Software Default Values The procedure in this section returns all AT-S39 software parameters to their default values. This procedure also deletes any VLANs that you have created on the switch. Note The AT-S39 software default values can be found in Appendix A, AT-S39 Default Settings on page 238. To return the AT-S39 management software to its default settings, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2.
Section II: Local and Telnet Management Resetting a Switch To reset a switch, perform the following procedure: 1. From the Main Menu, type 4 to select Administrator Menu. 2. From the Administrator Menu, type 9 to select Reset Switch. The following prompt is displayed: Please press key TWICE to proceed with the switch reset... 3. Press the Return key twice. The switch immediately reloads its operating system, a task requiring only a second or two to complete.
AT-S39 User’s Guide Configuring the AT-S39 Software Security Features The AT-S39 software has three features that can help prevent unauthorized individuals from changing the parameter settings of the AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches in your network. The security features are: ❑ Password - The management software prompts you for a password whenever you start a local or remote management session on a switch. The default password is “admin”. (The password is case-sensitive.
Section II: Local and Telnet Management For example, if you specify 2 minutes, the AT-S39 management software automatically ends a management session if it does not detect any activity from the local or remote management station after 2 minutes. 3. To configure web browser access, type 5 to select Web Server Access and, when prompted, type E to enable web access or D to disable web access. For example, if you disable web access, no one will be able to manage the switch remotely using a web browser. 4.
AT-S39 User’s Guide Viewing the AT-S39 Version Number and Switch MAC Address The procedure in this section displays the following switch information: ❑ AT-S39 version number ❑ Bootloader version number ❑ Serial number ❑ MAC Address To display the information, type 8 to select Diagnostics from the Main Menu. The Diagnostics window in Figure 7 is displayed. Allied Telesyn AT-8024 Ethernet Switch Diagnostics 1 2 3 4 5 6 7 - Application Software Version .... AT-S39 v1.4 Application Software Build Date .
Chapter 4 Enhanced Stacking This chapter explains the enhanced stacking feature.
AT-S39 User’s Guide Enhanced Stacking Overview The enhanced stacking feature can make it easier for you to manage the AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches in your network. It offers the following benefits: ❑ You can manage up to 24 switches from one local or remote management session. This eliminates the need of having to initiate a separate management session for each switch in your network. ❑ The switches can share the same IP address.
Section II: Local and Telnet Management 2. You must assign the master switch an IP address and subnet mask. A master switch must have an IP address and subnet mask. The other switches in an enhanced stack, referred to as slave switches, do not. If an enhanced stack will have more than one master switch, you must assign each master switch a unique IP address.
AT-S39 User’s Guide Example Figure 8 is an example of the enhanced stacking feature. Subnet A AT-8024 Master 1 IP Address 149.32.11.22 AT-8024 AT-8024 AT-8024 AT-8024 AT-8024 Master 2 AT-8024 AT-8024 IP Address 149.32.11.16 Router Subnet B AT-8024 Master 1 IP Address 149.32.09.18 Master 2 IP Address 149.32.09.24 AT-8024 AT-8024 AT-8024 AT-8024 AT-8024 Figure 8 Enhanced Stacking Example The example consists of a network of two subnets interconnected with a router.
Section II: Local and Telnet Management Setting a Switch’s Enhanced Stacking Status The enhanced stacking status of the switch can be master switch, slave switch, or unavailable. Each status is described below: ❑ Master switch - A master switch of a stack can be used to manage all the other AT-8024, AT-8024GB. and AT-8026FC Fast Ethernet Switches in a subnet. Once you have established a local or remote management session with the Master switch, you can access and manage all the switches in the subnet.
AT-S39 User’s Guide The window displays the current status of the switch at the end of selection “1 - Switch State.” For example, the switch’s current status in the figure above is Master. Note The “2 - Stacking Services” selection in the window is available only on master switches. 2. To change a switch’s stacking status, type 1 to select Switch State. The following prompt is displayed. Enter new setup (M/S/U) -> 3.
Section II: Local and Telnet Management Selecting a Switch in an Enhanced Stack The first thing that you should do before performing any procedure on a switch in an enhanced stack is check to be sure that you are performing it on the correct switch. If you assigned system names to your switches, then it is very easy. The name of the switch being managed is always displayed at the top of every management window.
AT-S39 User’s Guide 3. Type G to select Get/Refresh List of Switches. The Master switch polls the network for all slave and Master switches in the subnet and displays a list of the switches in the Stacking Services window. Note The Master switch on which you started the management session is not included in the list. Nor are any switches with an enhanced stacking status of Unavailable. 4. Type A to select Access Switch.
Chapter 5 Port Parameters The chapter contains procedures for viewing and changing the parameter settings for the individual ports on a switch.
AT-S39 User’s Guide Displaying Port Status To display the status of the ports on the switch, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. The Port Menu in Figure 11 is displayed. Allied Telesyn AT-8024 Ethernet Switch Port Menu 1 2 3 4 5 - Port Port Port Port Port Configuration Mirroring Trunking Status Security S - Save Configuration Changes R - Return to Previous Menu Enter your selection: Figure 11 Port Menu 2. From the Port Menu, type 4 to select Port Status.
Section II: Local and Telnet Management The Port Status window is displayed. Figure 12 is an example of the window.
AT-S39 User’s Guide MDI The operating configuration of the port. Possible values are Auto, MDI, MDI-X. The status Auto indicates that the port is automatically determining the appropriate MDI or MDI-X setting. Spd The operating speed of the port. Possible values are: 10 - 10 Mbps 100 - 100 Mbps 1000 - 1000 Mbps (AT-8024GB switch only) Dplx The duplex mode of the port. Possible values are half-duplex and full-duplex. PVID The port VLAN identifier currently assigned to the port.
Section II: Local and Telnet Management Configuring Port Parameters To configure the parameter settings for a port on the switch, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 1 to select Port Configuration. The following prompt is displayed: Starting Port to Configure [1 to 24] -> 3. Enter the number of the port you want to configure and press Return. To configure a range of ports, enter the first port of the range.
AT-S39 User’s Guide Note The Port Configuration window in the figure above is for a 10/100 Mbps twisted pair port. The window for a GBIC module in an AT-8024GB switch will contain a subset of the parameters. 5. Adjust the port parameters as desired. You adjust a parameter by typing its number. This toggles the parameter through its possible settings. The parameters are described below. 0 - Status You use this selection to enable or disable a port. When disabled, a port will not receive or transmit frames.
Section II: Local and Telnet Management Flow Control Flow control applies only to ports operating in full-duplex mode. The switch uses a special pause packet to stop the end node from sending frames. The pause packet notifies the end node to stop transmitting for a specified period of time. Possible settings are: None - No flow control on the port. Transmit - Flow control only as packets are being transmitted out the port. Receive - Flow control only on as packets are being received on the port.
AT-S39 User’s Guide B - Broadcast Control For background information on this selection and instructions on how to set the option, refer to Broadcast Frame Control Overview on page 152 and Configuring the Maximum Broadcast Frame Count on page 156. 6. Once you have set the port parameters, type S to select Save Configuration Changes. Configuration changes are immediately activated on a port. The Port configuration window features a Reset Port selection. You can use this option to reset the selected port.
Section II: Local and Telnet Management Displaying Uplink Information The AT-S39 management software can display basic manufacturer information about a GBIC module in an AT-8024GB switch or the fiber optic ports in an AT-8026FC switch. To display uplink information, perform the following procedure: 1. From the Main Menu, type 8 to select Diagnostics. 2. From the Diagnostics window, type 7 to select GBIC Uplink Information. The GBIC Information window in Figure 14 is displayed.
AT-S39 User’s Guide The management software displays a window containing basic information about the GBIC module. Figure 15 is an example of the window. Allied Telesyn AT-8024GB Ethernet Switch GBIC Information Menu Port Number ...................... Type of Serial Interface ......... Extended Serial Transceiver ...... Connector Type ................... Elect/Opt Transceiver ............ Shortwave laser w/o OFC M5 M6 100 MBytes/sec Serial Encoding .................. Length 9/125 mm Fib. (k) .........
Chapter 6 Port Security This chapter contains the procedures for setting port security. The sections in this chapter include: ❑ Port Security Overview on page 65 ❑ Configuring Port Security on page 67 ❑ Configuring the Limited Security Mode on page 69 Note Port security does not apply to ports on GBIC modules in an AT-8024GB switch. Note Port security can only be set through a local management session, You cannot set port security from a Telnet management session.
AT-S39 User’s Guide Port Security Overview The port security feature can enhance the security of your network. You can use the feature to control the number of MAC addresses learned on the ports, and so control the number of network devices that can forward frames through the switch. There are four levels of port security. Only one security level can be active on a switch at a time. Automatic This operating mode disables port security.
Section II: Local and Telnet Management Secure This security level instructs the switch to forward frames based solely on static MAC addresses. When this security level is activated, the switch deletes all dynamic MAC addresses and disables the MAC address table so that no new addresses can be learned. The switch also deletes any addresses in the static MAC address table.
AT-S39 User’s Guide Configuring Port Security Note Port security can only be set through a local management session, You cannot set port security from a Telnet management session. To set a switch’s port security level, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 5 to select Port Security. The Port Security menu in Figure 16 is displayed. Allied Telesyn AT-8024 Ethernet Switch Port Security The current mode is AUTOMATIC.
Section II: Local and Telnet Management ❑ To stop the switch from learning new dynamic MAC addresses and have it forward frames based only on static MAC addresses and on those dynamic addresses that it has already learned, type 4 to select Lock all the ports now. Note Only one security level can be active on a switch at a time. A change to the security level is immediately activated on the switch.
AT-S39 User’s Guide Configuring the Limited Security Mode The Limited security mode lets you set a maximum number of dynamic MAC addresses each port on a switch can learn. When you activate this security level, the switch deletes all MAC addresses in the dynamic MAC address table and immediately begins to learn new addresses as frames are received on the ports. Once the maximum number of MAC addresses have been learned by a port, frames with new source MAC addresses are discarded and are not forwarded.
Section II: Local and Telnet Management 4. Type 2 to select Set MAC limits per port. The Set MAC Limit Menu in Figure 18 is displayed. Allied Telesyn AT-8024 Ethernet Switch Set MAC Limit Menu 1 2 3 4 - Enter a threshold Select a port Set MAC limit for selected port Apply this MAC limit to all ports R - Return to Previous Menu Enter your selection: Figure 18 Set MAC Limit Menu 5. Type 2 to choose Select a port. The following prompt is displayed: Please enter a port number: [1 to 24] -> 6.
AT-S39 User’s Guide The dynamic MAC address limits are applied to the ports on the switch. Limited security has now been configured on the switch. 14. Type 1 to select Display MAC limit per port. The current MAC address limits for all the ports are displayed. 15. Examine the MAC limits. Check to be sure that they are correct. If you assigned different values to different ports, be sure that the different values apply to the correct ports.
Chapter 7 Port Trunking This chapter contains the procedures for creating and deleting port trunks.
AT-S39 User’s Guide Port Trunking Overview Port trunking is an economical way for you to increase the bandwidth between two switches. A port trunk is 2, 3, or 4 ports that have been grouped together to function as one logical path. A port trunk increases the bandwidth between switches and is useful in situations where a single physical data link between switches is insufficient to handle the traffic load.
❑ When cabling a trunk, the order of the connections should be maintained on both nodes. The lowest numbered port in a trunk on the switch should be connected to the lowest numbered port of the trunk on the other device, the next lowest numbered port on the switch should be connected to the next lowest numbered port on the other device, and so on. For example, assume that you are connecting a trunk between two AT-8024 switches. On the first AT-8024 switch you had chosen ports 12, 13, 14, 15 for the trunk.
AT-S39 User’s Guide Creating a Port Trunk This section contains the procedure for creating a port trunk on the switch. Be sure to review the guidelines in Port Trunking Overview on page 73 before performing the procedure. Caution Do not connect the cables to the trunk ports on the switches until after you have configured the trunk with the management software. Connecting the cables before configuring the software will create a loop in your network topology.
3. Type 1 to select Trunk Ports. The following prompt is displayed. Enter Trunk Port(s) -> 4. Enter the ports that will constitute the port trunk and press Return. You can specify the ports individually (e.g., 1,2,3,4) or as a range (e.g., 7-10). 5. Type S to select Save Configuration Changes. 6. Configure the ports on the remote end node for port trunking. Refer to the instructions included with the node for directions on how to create a port trunk. 7.
AT-S39 User’s Guide Deleting a Port Trunk Caution Disconnect the cables from the port trunk on the switch before performing the following procedure. Deleting a port trunk without first disconnecting the cables can create loops in your network topology. Data loops can result in broadcast storms and poor network performance. To delete a port trunk from the switch, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 3 to select Port Trunking.
Chapter 8 Port Mirroring This chapter contains the procedures for creating and deleting a port mirror.
AT-S39 User’s Guide Port Mirroring Overview The port mirroring feature allows you to unobtrusively monitor the traffic being received and transmitted on one or more ports on a switch by having the traffic copied to another switch port. You can connect a network analyzer to the port where the traffic is being copied and monitor the traffic on the other ports without impacting network performance or speed.
Creating a Port Mirror To create a port mirror, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 2 to select Port Mirroring. The Port Mirroring menu in Figure 21 is displayed. Allied Telesyn AT-8024 Ethernet Switch Port Mirroring 1 - Mirror (Destination) Port ....... None 2 - Mirroring (Source) Port ......... None S - Save Configuration Changes R - Return to Previous Menu Enter your selection: Figure 21 Port Trunking Menu 3.
AT-S39 User’s Guide Deleting a Port Mirror To delete a port mirror, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 2 to select Port Mirroring. The Port Mirroring menu in Figure 21 on page 80 is displayed. 3. Type 1 to select Mirror (Destination) Port. The following prompt is displayed. Enter mirror port (0=None) [0 to 24] -> 4. Enter 0 and press Return. 5. Type S to select Save Configuration Changes. The port mirror on the switch is deleted.
Chapter 9 Spanning Tree Protocol This chapter provides introductory information on the Spanning Tree Protocol (STP) and explains how to adjust the STP bridge and port parameters. The sections in this chapter include: ❑ STP Overview on page 83 ❑ Configuring a Bridge’s STP Settings on page 86 ❑ Configuring STP Port Settings on page 88 Note For detailed information on the Spanning Tree Protocol, refer to Section 4 of IEEE Std 802.1D, ISO/IEC 10038: 1993.
AT-S39 User’s Guide STP Overview The AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches support the Spanning Tree Protocol, as specified in the IEEE 802.1D standard. STP can be an important part of large networks where loops, either planned or unplanned, exist in the network topology. A loop exists when two or more nodes on your network can transmit data to each other over more than one data link. A network loop can pose a danger to network performance and operability.
Section II: Local and Telnet Management Finding and Resolving Redundant Paths Once the Root Bridge has been selected, the bridges must determine if the network contains redundant paths and, if one is found, they must select a preferred path while placing the redundant paths in a backup or blocking state.
AT-S39 User’s Guide Handling Topology Changes If there is a change in the network topology due to a failure, removal, or addition of any active components, the active topology also changes. This may trigger a change in the state of some blocked ports. However, a change in a port state is not activated immediately. It might take time for the root bridge to notify all bridges that a topology change has occurred, especially if it is a large network.
Section II: Local and Telnet Management Configuring a Bridge’s STP Settings This section contains the procedure for configuring a bridge’s STP settings. Caution STP on a bridge is disabled by default. If you enable STP, the bridge provides default STP parameters that are adequate for most networks. Changing them without prior experience and an understanding of how STP works might have a negative effect on your network. You should consult the IEEE 802.1d standard before changing any of the STP parameters.
AT-S39 User’s Guide 2 - Bridge Identifier The MAC address of the bridge. The bridge identifier is used as a tie breaker when selecting the root bridge if two or more bridges have the same bridge priority value. The Bridge Identifier cannot be changed. 3 - Bridge Priority The priority number for the bridge. This number is used in determining the root bridge for STP. The bridge with the lowest priority number is selected as the root bridge.
Section II: Local and Telnet Management Configuring STP Port Settings To adjust STP port parameters, perform the following procedure: 1. From the Main Menu, type 3 to select Spanning Tree Menu. 2. From the Spanning Tree menu, type 7 to select Config STP port settings. The following prompt is displayed: Starting Port to Configure [1 to 24] -> 3. Enter the number of the port you want to configure. To configure a range of ports, enter the first port of the range.
AT-S39 User’s Guide 2 - Path Cost The spanning tree algorithm uses the cost parameter to decide which port provides the lowest cost path to the root bridge for that LAN. The default values for this parameter are 100 for a 10 Mbps port, 10 for a 100 Mbps port, and 4 for a 1 Gbps port. The range is 1 to 65535. 3 - Priority This parameter is used as a tie breaker when two or more ports are determined to have equal costs to the root bridge. The default value for priority is 128. The range is 0-255.
Chapter 10 Virtual LANs This chapter contains basic information about virtual LANs (VLANs). It also contains the procedures for creating, modifying, and deleting VLANs from a local or Telnet management session. This chapter also describes the Basic VLAN mode and how you can change a switch’s VLAN operating mode.
AT-S39 User’s Guide VLAN Overview A VLAN is a group of ports on an Ethernet switch that form a logical Ethernet segment. The ports of a VLAN form an independent broadcast domain where the traffic generated by the nodes of a VLAN remains within the VLAN. With VLANs, you can segment your network through the switch’s management software and so be able to group nodes with related functions into their own separate, logical LAN segments.
Section II: Local and Telnet Management But with VLANS, you can change the LAN segment assignment of an end node connected to the switch through the switch’s AT-S39 management software. VLAN memberships can be changed any time through the management software without moving the workstations physically, or having to change group memberships by moving cables from one switch port to another. Additionally, a virtual LAN can span more than one switch.
AT-S39 User’s Guide Port-based VLAN Overview As explained in the VLAN Overview section earlier in this chapter, a VLAN consists of a group of ports on one or more Ethernet switches that form an independent broadcast domain. Traffic generated by the end nodes of a VLAN remains within the VLAN and does not cross over to the end nodes of other VLANs unless there is an interconnection device, such as a router or Layer 3 switch.
Section II: Local and Telnet Management If a VLAN spans multiple switches, then the VID for the VLAN on the different switches must be the same. In this manner, the switches are able to recognize and forward frames belonging to the same VLAN even though the VLAN spans multiple switches. For example, if you had a port-based VLAN titled Marketing that spanned three AT-8024 switches, you would assign the Marketing VLAN on each switch the same VID.
AT-S39 User’s Guide For example, assume that you were creating a port-based VLAN on a switch and you had assigned the VLAN the VID 5. Consequently, the PVID for each port in the VLAN would need to be assigned the value 5. Some switches and switch management programs require that you assign the PVID value for each port manually. However, the AT-S39 management software performs this task automatically.
Section II: Local and Telnet Management Drawbacks to Port-based VLANs There are several drawbacks to port-based VLANs: ❑ It is not easy to share network resources, such as servers and printers, across multiple VLANs. A router or Layer 3 switch must be added to the network to provide a means for interconnecting the port-based VLANs. ❑ The introduction of a router into your network could create security issues from unauthorized access to your network.
AT-S39 User’s Guide Port-based Example 1 Figure 24 illustrates an example of one AT-8024 Fast Ethernet Switch with three port-based VLANs. (For purposes of the following examples, the Default VLAN is not shown.
Section II: Local and Telnet Management In the example, each VLAN has one port connected to the router. The router interconnects the various VLANs and functions as a gateway to the WAN. Port-based Example 2 Figure 25 illustrates more port-based VLANs. In this example, two VLANs span more than one Ethernet switch.
AT-S39 User’s Guide The table below lists the port assignments for the Sales, Engineering, and Production VLANs on the switches: Sales VLAN (VID 2) Engineering VLAN (VID 3) Production VLAN (VID 4) AT-8024 Switch (top) Ports 1 - 6, 18 (PVID 2) Ports 9 - 11, 14, 20 (PVID 3) Ports 21 - 24 (PVID 4) AT-8024 Switch (bottom) Ports 1 - 6 (PVID 2) Ports 13, 19-24 (PVID 3) none ❑ Sales VLAN - This VLAN spans both switches.
Section II: Local and Telnet Management Tagged VLAN Overview The second type of VLAN supported by the AT-8024 and AT-8024GB Switches is a tagged VLAN. VLAN membership in a tagged VLAN is determined by information within the frames that are received on a port. This contrasts to a port-based VLAN, where the PVIDs assigned to the ports determine VLAN membership. The VLAN information within an Ethernet frame is referred to as a tag or tagged header.
AT-S39 User’s Guide The parts of a tagged VLAN are much the same as those for a port-based VLAN. They are: ❑ VLAN Name ❑ VLAN Identifier ❑ Tagged and Untagged Ports ❑ Port VLAN Identifier Note For explanations of VLAN name and VLAN identifier, refer back to VLAN Name and VLAN Identifier on page 93. Tagged and Untagged Ports You need to specify which ports will be members of the VLAN. In the case of a tagged VLAN, it will usually be a combination of both untagged ports and tagged ports.
Section II: Local and Telnet Management General Rules to Creating a Tagged VLAN Below is a summary of the rules to observe when creating a tagged VLAN. ❑ Each tagged VLAN must be assigned a unique VID. If a particular VLAN spans multiple switches or stacks, each part of the VLAN on the different switches or stacks must be assigned the same VID. ❑ A tagged port can be a member of multiple VLANs. ❑ An untagged port can be an untagged member of only one VLAN at a time.
AT-S39 User’s Guide Tagged VLAN Example Figure 26 illustrates how tagged ports can be used to interconnect IEEE 802.1Q-based products. Engineering VLAN (VID 3) Legacy Server Production VLAN (VID 4) Sales VLAN (VID 2) AT-8024 Ethernet Switch AT-8024 RS-232 TERMINAL PORT 10Base-T / 100Base-TX Fast Ethernet Switch MODE Link COL Mode Link 100 Mode ACT FAULT MASTER FULL PWR WAN IEEE 802.
Section II: Local and Telnet Management The port assignments for the VLANs are as follows: Sales VLAN (VID 2) Engineering VLAN (VID 3) Production VLAN (VID 4) Untagged Ports Tagged Ports Untagged Ports Tagged Ports Untagged Ports Tagged Ports AT-8024 Switch (top) 1 to 5, 18 (PVID 2) 8, 16 9 to 11, 20 (PVID 3) 8, 16 21 to 24 (PVID 4) 8 AT-8024 Switch (bottom) 1 to 5 (PVID 2) 15 19 to 24 (PVID 3) 15 none none This example is nearly identical to the Port-based Example 2 on page 98.
AT-S39 User’s Guide Basic VLAN Mode Overview The Fast Ethernet Switches support a special VLAN configuration referred to as Basic VLAN Mode. When the Basic VLAN Mode is activated, frames are forwarded based solely on MAC addresses. All VLAN information, including PVIDs assigned to ports and VLAN tags in tagged frames, is ignored. Tagged frames are analyzed only for priority level. Packets are passed through the switch unchanged.
Section II: Local and Telnet Management Creating a Port-based or Tagged VLAN To create a new port-based or tagged VLAN, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. The VLAN Menu in Figure 27 is displayed. Allied Telesyn AT-8024 Ethernet Switch VLAN Menu 1 - Virtual LAN Support 2 - Virtual LAN Definitions 3 - Port VLANs & Priorities R - Return to Previous Menu Enter your selection: Figure 27 VLAN Menu 2. From the VLAN Menu, type 2 to select Virtual LAN Definitions.
AT-S39 User’s Guide The Create a VLAN window in Figure 29 is displayed. Allied Telesyn AT-8024 Ethernet Switch Create a VLAN 1 2 3 4 5 6 - VLAN Name ............ VLAN ID (VID) ........ 0 Tagged Ports ......... Untagged Ports ....... Mirroring Port ....... 0 Send to CPU (Y/N) .... C - Create VLAN R - Previous Menu Enter your selection: Figure 29 Create a VLAN Window 4. Type 1 to select VLAN Name and enter a name for the new VLAN. The name can be from one to ten characters in length.
Section II: Local and Telnet Management 6. If the VLAN will contain tagged ports, type 3 to select Tagged Ports and specify the ports. If this VLAN will not contain any tagged ports, leave this field empty. You can specify the ports individually (e.g., 2,3,5), as a range (e.g., 7-9), or both (e.g., 2,5,7-9) 7. Type 4 to select Untagged Ports and specify the ports on the switch to function as untagged ports in the VLAN. If this VLAN will not contain any untagged ports, leave this field empty.
AT-S39 User’s Guide 14. Check to see that the VLAN was created correctly and that it contains the appropriate ports. 15. Press Esc or type R to return to the Virtual LAN Definitions menu. You can repeat this procedure to create additional VLANs. Note When you create a new VLAN, ports designated as untagged ports of the new VLAN are automatically removed from their current VLAN assignment.
Section II: Local and Telnet Management Example of Creating a Port-based VLAN The following procedure creates the Sales VLAN illustrated in Portbased Example 1 on page 97. This VLAN will be assigned a VID of 2 and will consist of four untagged ports, Ports 1 to 4. The VLAN will not contain any tagged ports. The VLAN traffic will not be mirrored on another port, nor will it be sent to the switch’s CPU. To create the example Sales VLAN, perform the following procedure: 1.
AT-S39 User’s Guide Example of Creating a Tagged VLAN The following procedure creates the Engineering VLAN in the top switch illustrated in Tagged VLAN Example on page 103. This VLAN will be assigned a VID of 3. It will consist of four untagged ports, Ports 9, 11, 12, and 20, and two untagged ports, Ports 8 and 16. The VLAN traffic will not be mirrored on another port, nor will it be sent to the switch’s CPU. To create the example Engineering VLAN, perform the following procedure: 1.
Section II: Local and Telnet Management Modifying a VLAN Note You need to know the VID of the VLAN you want to modify to perform this procedure. To view a VLAN’s VID, refer to the procedure Displaying VLAN Information on page 116. To modify a VLAN, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. 2. From the VLAN Menu, type 2 to select Virtual LAN Definitions. 3. From the Virtual LAN Definitions menu, type 2 to select Modify a VLAN.
AT-S39 User’s Guide When changing a VLAN’s name, observe the following guidelines: ❑ A VLANs new name cannot be the same as another VLAN on the same switch. For example, if the switch already contains a VLAN called Sales, you cannot change an existing VLAN’s name to Sales. ❑ You cannot change the name of the Default VLAN. Note A VLAN must be assigned a name. 2 - VLAN ID (VID) Use this selection to change a VLAN’s VID value. The permitted range of the VID value is 2 to 4096.
Section II: Local and Telnet Management When adding or removing untagged ports, observe the following guidelines: ❑ To add or remove untagged ports, enter the new list of untagged ports for the VLAN. For example, if the VLAN currently contains untagged ports 15 through 19 and you want to add ports 4 through 9, you would enter “4-9,15-19”. ❑ If the VLAN will not contain any untagged ports, leave this field empty. ❑ If you want to remove all untagged ports from the VLAN, enter a 0 (zero) for this value.
AT-S39 User’s Guide 9. Type R to select Return to Previous Menu. The Virtual LAN Definitions menu in Figure 28 is displayed. 10. Type S to select Save Configuration Changes. The VLAN has been modified. 11. Repeat this procedure starting with Step 3 to modify other VLANs.
Section II: Local and Telnet Management Displaying VLAN Information To view the names, VID numbers, and member ports of all the VLANs on a switch, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. 2. From the VLAN Menu, type 2 to select Virtual LAN Definitions. 3. From the Virtual LAN Definitions menu, type 4 to select View All VLANs. The Show All VLANs window is displayed. An example of the window is shown in Figure 31.
AT-S39 User’s Guide Deleting a VLAN Note You need to know the VID of the VLAN you want to delete to perform this procedure. To obtain a VLAN’s VID, refer to the procedure Displaying VLAN Information on page 116. To delete a VLAN, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. 2. From the VLAN Menu, type 2 to select Virtual LAN Definitions. 3. From the Virtual LAN Definitions menu, type 3 to select Delete a VLAN. The Delete a VLAN menu in Figure 32 is displayed.
Section II: Local and Telnet Management 6. Type D to delete the VLAN or R to cancel the procedure. The following confirmation prompt is displayed: Are you sure you want to delete this VLAN (Y/N):. 7. Type Y to delete the VLAN or N to cancel the procedure. Press Return. The following prompt is displayed: SUCCESS - Press any key to continue. 8. Press any key. 9. Type R to select Return to Previous Menu. The Virtual LAN Definitions menu in Figure 28 on page 106 is displayed. 10.
AT-S39 User’s Guide Deleting All VLANs This section contains the procedure for deleting all VLANs, except the Default VLAN, on a switch. To delete selected VLANs, perform the procedure Deleting a VLAN on page 117. To delete all VLANs on a switch, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. 2. From the VLAN Menu, type 2 to select Virtual LAN Definitions. 3. From the Virtual LAN Definitions menu, type 5 to select Clear All VLANs. A confirmation message is displayed. 4.
Section II: Local and Telnet Management Changing a PVID Value The procedure in this section explains how to change a PVID value for a port. As explained in Port-based VLAN Overview on page 93, a port receives a PVID when it is assigned as an untagged port to a VLAN. A port’s PVID will be the same as the VLAN’s VID to which it has been assigned. For example, if you assign Port 4 on the switch as an untagged port to a VLAN with a VID of 7, then the port will be assigned a PVID also of 7.
AT-S39 User’s Guide The Port VLANS & Priorities window in Figure 34 is displayed. Allied Telesyn AT-8024 Ethernet Switch Port VLANs & Priorities 1 2 3 4 - Port Number ................... Port VLAN ID .................. Priority (0-7) 0=Low 7=High ... Override Priority (Y/N) ....... 1 1 0 N U - Update Changes S - Save Configuration Changes R - Return to Previous Menu Enter your selection: Figure 34 Port VLANs and Priorities Window 5. Type 2 to select Port VLAN ID.
Section II: Local and Telnet Management Setting a Switch’s VLAN Mode This section contains the procedure for setting a switch’s VLAN mode. You can configure a switch to support port-based and tagged VLANs or to operate in the Basic VLAN mode. Port-based and tagged VLANs and the Basic VLAN mode are all described in earlier sections in this chapter. To configure a switch’s VLAN mode, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2. Type 2 to select Switch Mode.
AT-S39 User’s Guide Enabling or Disabling All VLANs This procedure performs exactly the same function as the previous procedure. It sets a switch’s VLAN mode. When VLANs are enabled, the switch supports port-based and tagged VLANs. When VLANs are disabled, the switch supports the Basic VLAN mode. The only difference between the two procedures has to do with ingress filtering. If you activate the Basic VLAN Mode using the previous procedure, ingress filtering is disabled.
Section II: Local and Telnet Management The prompt enclosed in asterisks gives the current status of the VLANs. 4. Type E to enable the VLANs or D to activate the Basic VLAN Mode. A change to the status of the VLANs is activated immediately on the switch. 5. Type R to select Return to Previous Menu. 6. Type S to select Save Configuration Changes.
AT-S39 User’s Guide Enabling or Disabling Ingress Filtering There are certain rules a switch follows as it receives and forwards an Ethernet frame. There are rules for frames as they enter a port (called ingress rules) and rules for when a frame is transmitted out a port (called egress rules). A switch will not accept and forward a frame unless the frame passes the ingress and egress rules. There are quite a few ingress and egress rules for Fast Ethernet switches.
Section II: Local and Telnet Management There is one other thing that should be mentioned about ingress filtering and tagged packets, and that is the priority tag. Each tagged frame has a priority tag in it that instructs the switch as to the importance of the frame. Frames with a high priority are handled ahead of frames with a low priority. Activating or deactivating ingress filtering has no effect on the switch’s handling of priority tags.
Chapter 11 MAC Address Table The chapter contains the procedures for viewing the static and dynamic MAC address table.
Section II: Local and Telnet Management MAC Address Overview Every hardware device that you connect to your network has a unique MAC address associated with it. A MAC address is assigned to a device by the device’s manufacturer. For example, every network interface card that you use to connect your computers to your network has a MAC address assigned to it by the adapter’s manufacturer. The AT-8024, AT-8024GB, and AT-8026FC Fast Ethernet Switches contain a 4 kilobyte MAC address table.
AT-S39 User’s Guide The type of MAC address described above is referred to as a dynamic MAC address. Dynamic MAC addresses are addresses that the switch learns by examining the source MAC addresses of the frames received on the ports. Dynamic MAC addresses are not stored indefinitely in the MAC address table. The switch deletes a dynamic MAC address from the table if it does not receive any frames from the node over a specified period of time.
Section II: Local and Telnet Management Displaying MAC Addresses The management software has two menu selections for displaying the MAC addresses of a switch. One selection displays both the static and dynamic MAC addresses while the other displays just the static addresses. To display the MAC address table, perform the following procedure: 1. From the Main Menu, type 6 to select MAC Address Tables. The MAC Address Table menu in Figure 38 is displayed.
AT-S39 User’s Guide The management software displays the MAC addresses. Figure 39 is an example of the Show All MAC Addresses window, which displays both static and dynamic MAC addresses. The static MAC address window is exactly the same, except for the title and the fact that it displays only static MAC addresses.
Section II: Local and Telnet Management The port numbering scheme is from right to left. As an example, assume that ports 1 through 4 on the switch were members of the same multicast group. This would be represented in the column as follows: “0000000F”. Another example is “000020F. This example would indicate that ports 1 to 4 and port 10 on the switch were members of the same multicast group. CPU Indicates whether the traffic received on the port is sent to the switch’s CPU.
AT-S39 User’s Guide Viewing MAC Addresses by Port This section contains the procedure for viewing the dynamic MAC addresses that have been learned on a particular port. You can also use this procedure to view any static MAC addresses that have been assigned to a port. 1. From the Main Menu, type 6 to select MAC Address Table. 2. From the MAC Address Table menu, type 6 to select View MAC Addresses by Port Menu. The following prompt is displayed: Please enter port number -> [1 to 26] -> 3.
Section II: Local and Telnet Management Identifying a Port Number by MAC Address In some situations, you might want to know which port a particular MAC address was learned. You could display the MAC address table and scroll through the list looking for the MAC address. But if the switch is part of a large network, finding the address could prove difficult. The procedure in this section offers an easier way.
AT-S39 User’s Guide Viewing the MAC Addresses of a VLAN The procedure in this section can be useful if you created VLANs on the switch and want to view the MAC addresses of the nodes of a particular VLAN. (This procedure is not of much value if the switch contains only the Default VLAN, in which case displaying the entire MAC address table, as explained earlier in this chapter, produces the same result.
Section II: Local and Telnet Management Deleting All Dynamic MAC Addresses The management software allows you to purge the MAC address table of all dynamic MAC addresses. Once the table has been purged, the switch immediately begins to relearn the MAC addresses as frames are received on the ports. Note This procedure does not delete static MAC addresses. To delete all dynamic MAC addresses from the MAC address table, perform the following procedure. 1.
AT-S39 User’s Guide Adding Static MAC Addresses The management software allows you to assign up to 255 static MAC addresses per port on an AT-8024 or AT-8024GB Fast Ethernet Switch. To add a static address to the MAC address table, perform the following procedure: 1. From the Main Menu, type 6 to select MAC Address Table. 2. From the MAC Address Table menu, type 2 to select Add Static MAC Address. The following prompt is displayed: Please enter a MAC address: 3.
Section II: Local and Telnet Management Deleting MAC Addresses The following procedure explains how to delete a static or dynamic MAC address from the MAC address table. To delete an address from the MAC address table, perform the following procedure: 1. From the Main Menu, type 6 to select MAC Address Table. 2. From the MAC Address Table menu, type 3 to select Delete MAC Address. The following prompt is displayed: Please enter a MAC address: 3.
AT-S39 User’s Guide Changing the Aging Time The switch uses the aging time to delete inactive dynamic MAC addresses from the MAC address table. When the switch detects that no packets have been sent to or received from a particular MAC address in the table after the period specified by the aging time, the switch deletes the address. This prevents the table from becoming full of addresses of nodes that are no longer active. The default setting for the aging time is 300 seconds (5 minutes).
Chapter 12 Class of Service This chapter contains the procedures for configuring the Class of Service (CoS) feature of the AT-S39 software.
AT-S39 User’s Guide Class of Service Overview The AT-8024, AT-8024GB, and AT-8026FC switches support CoS as specified in the IEEE 802.1p and 802.1Q standards. CoS can be important in network environments where there are time-critical applications, such as voice transmission or video conferencing, that can be adversely affected by packet transfer delays. Prior to CoS, network traffic was handled in a best-effort manner. File transfer delays did occur, but were mostly transparent to network users.
Section II: Local and Telnet Management Configuring CoS To configure CoS for a port, perform the following procedure: 1. From the Main Menu, type 2 to select VLAN Menu. 2. From the VLAN Menu, type 3 to select Port VLANS & Priorities. 3. Type 1 to select Port Number. Enter new value -> [1 to 26] -> 4. Enter the number of the port on the switch where you want to configure CoS. Press Return. The Port VLANS & Priorities window in Figure 34 on page 121 is displayed. 5. Type 3 to select Priority (0 - 7). 6.
Chapter 13 IGMP Snooping This chapter explains how to activate and configure the Internet Group Management Protocol (IGMP) snooping feature on the switch.
Section II: Local and Telnet Management IGMP Snooping Overview IGMP snooping is best explained by first defining IGMP. This protocol enables routers to create lists of nodes that are members of multicast groups. (A multicast group is a group of end nodes that want to receive multicast packets from a multicast application.) The router creates a multicast membership list by periodically sending out queries to the local area networks connected to its ports.
AT-S39 User’s Guide Without IGMP snooping, a switch would have to flood multicast packets out all of its ports, except the port on which it received the packet. Such flooding of packets can negatively impact switch and network performance. The AT-8024, AT-8024GB, and AT-8026FC switches support both IGMP Version 1 and Version 2.
Section II: Local and Telnet Management Activating IGMP Snooping To activate or deactivate IGMP snooping on the switch and to configure IGMP snooping parameters, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2. From the System Configuration Menu, type 7 to select Advanced Configuration. 3. From the Advanced Configuration window, type 1 to select IGMP Snooping Configuration. The IGMP Snooping Configuration window in Figure 40 is displayed.
AT-S39 User’s Guide multicast group by sending a leave request or when the host node stops sending reports. The switch responds by immediately ceasing the transmission of further multicast packets out the port where the host node is connected. The Multi-Host setting is appropriate if there is more than one host node connected to a switch port, such as when a port is connected to an Ethernet hub to which multiple host nodes are connected.
Section II: Local and Telnet Management 5 - Multicast Router Port(s) Specifies the port on the switch to which the multicast router is detected. You can let the switch determine this automatically by selecting Auto Detect, or you can specify the port yourself by entering a port number. To select Auto Detect, enter “0” (zero) for this parameter. You can specify more than one port. Note Selections 6 and 7 in the menu are discussed later in this chapter. 4.
AT-S39 User’s Guide Displaying a List of Host Nodes You can use the AT-S39 software to display a list of the multicast groups on a switch, as well as the host nodes. To display the list, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2. From the System Configuration Menu, type 7 to select Advanced Configuration. 3. From the Advanced Configuration window, type 1 to select IGMP Snooping Configuration.
Section II: Local and Telnet Management Displaying a List of Multicast Routers A multicast router is a router that is receiving multicast packets from a multicast application and transmitting the packets to host nodes. You can use the AT-S39 software to display a list of the multicast routers that are connected to the switch. To display a list of the multicast routers, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2.
Chapter 14 Broadcast Frame Control This chapter contains the procedures for configuring the broadcast frame control feature of the AT-S39 management software.
Section II: Local and Telnet Management Broadcast Frame Control Overview Most frames on an Ethernet network are unicast frames. A unicast frame is sent to a single destination. That is, the node sending a unicast frame intends the frame for a particular node on the network. For example, when a node needs to send a file to a network server for storage, the node sends the file in unicast Ethernet frames containing the destination address of the server where the file is to be stored.
AT-S39 User’s Guide Here’s an example. Let’s assume that you sent the timer interval for 100 Mbps ports to 100 milliseconds and the maximum broadcast frame limit for a particular 100 Mbps port on the switch to 200 broadcast frames. At these settings, the port will accept up to 200 broadcast frames every 100 milliseconds. If the maximum is exceeded during the specified time interval, the broadcast frames over the limit are discarded by the port and are not forwarded by the switch.
Section II: Local and Telnet Management Configuring the Interval Timer To set the interval timer for the broadcast frame control feature, perform the following procedure: 1. From the Main Menu, type 5 to select System Config Menu. 2. From the System Configuration Menu, type 7 to select Advanced Configuration. 3. From the Advanced Configuration Menu, type 2 to select Broadcast Timers Setup. The Broadcast Storm Control window in Figure 43 is displayed.
AT-S39 User’s Guide For example, if you enter “20” for the interval timer for 10 Mbps ports, the management software multiples the value by 10. The result would be an interval timer of 200 milliseconds for ports operating at 10 Mbps. The default value is “0” for all timers. A value of “0” disables the broadcast frame control feature for ports operating at the corresponding timer speed. Note The 1000 Mbps speed applies only to GBIC modules in an AT-8024GB switch. 5.
Section II: Local and Telnet Management Configuring the Maximum Broadcast Frame Count To specify the maximum number of broadcast frames a port on the switch can receive and forward, perform the following procedure: 1. From the Main Menu, type 1 to select Port Menu. 2. From the Port Menu, type 1 to select Port Configuration. The following prompt is displayed: Starting Port to Configure [1 to 24] -> 3. Enter the number of the port you want to configure and press Return.
Chapter 15 Ethernet Statistics This chapter contains the procedures for displaying data traffic statistics.
Section II: Local and Telnet Management Displaying Port Statistics To display Ethernet port statistics, perform the following procedure: 1. From the Main Menu, type 7 to select Ethernet Statistics. The Ethernet Statistics menu in Figure 44 is displayed. Allied Telesyn AT-8024 Ethernet Switch Ethernet Statistics 1 - Port Statistics Menu 2 - Clear Module Statistics 3 - Display Module Statistics R - Return to Previous Menu Enter your selection: Figure 44 Ethernet Statistics Menu 2.
AT-S39 User’s Guide The statistics for the port are displayed in the Display Port Statistics window, shown in Figure 46. Allied Telesyn AT-8024 Ethernet Switch Display Port Statistics Ethernet statistics for port #1 TOTAL_COUNT ................. TX_COUNT .................... RX_COUNT .................... RX_BRDCAST .................. RX_MLTCAST .................. RX_UNICAST .................. RX_OVERFLOW ................. CRC_ERROR ................... UNDERSIZE ................... OVERSIZE ................
Section II: Local and Telnet Management Undersize Packets Number of packets that were less than the minimum length specified by IEEE 802.3 (64 bytes including the CRC) received on the port. Fragmented Packets Number of undersized packets, packets with alignment errors, and packets with FCS errors (CRC errors) received on the port. Oversize Packets Number of packets exceeding the maximum specified by IEEE 802.3 (1518 bytes including the CRC) received on the port.
AT-S39 User’s Guide Displaying Switch Statistics To display Ethernet statistics for an entire switch, perform the following procedure: 1. From the Main Menu, type 7 to select Ethernet Statistics. 2. From the Ethernet Statistics menu, type 3 to select Display Module Statistics. The statistics for the port are displayed in the Display Port Statistics window, shown in Figure 46. Allied Telesyn AT-8024 Ethernet Switch Display Module Statistics Ethernet statistics for this module TOTAL_COUNT .................
Section II: Local and Telnet Management Received Broadcast Number of broadcast packets received on the switch. Received Multicast Number of multicast packets received on the switch. CRC Error Number of packets with a cyclic redundancy check (CRC) error but with the proper length (64-1518 bytes) received by the switch. Undersize Packets Number of packets that were less than the minimum length specified by IEEE 802.3 (64 bytes including the CRC) received on the switch.
Chapter 16 Management Software Updates This chapter explains how to obtain new versions of the AT-S39 management software and how to download the software onto an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch.
Section II: Local and Telnet Management Obtaining Software Updates New releases of the AT-S39 management software are available from the Allied Telesyn web site at www.alliedtelesyn.com and our FTP server at ftp.alliedtelesyn.com. To log on to the FTP server, enter “anonymous” for the user name and your email address for the password. Management software for these switches will have “S39” as part of the filename. Note The AT-8024, AT-8024GB, and AT-8026FC switches use the same management software image.
AT-S39 User’s Guide Downloading New Management Software from a Local Management Session This section contains the procedure for downloading a new version of the AT-S39 management software onto a switch. You can also use this procedure to download a new boot loader file onto the switch or a configuration file. Note You cannot perform this procedure from a Telnet or web browser management session. Caution The switch will not forward Ethernet traffic during the software download and initialization process.
Section II: Local and Telnet Management The following menu is displayed: Allied Telesyn AT-8024 Ethernet Switch Xmodem Downloads 1 - Xmodem Image Download 2 - Xmodem Config Download 3 - Xmodem Boot Loader Download R - Return to Previous Menu Enter your selection: Figure 48 Xmodem Downloads & Uploads Menu Note This version of the management software does not allow you to upload a configuration file from a workstation to a switch using the management software.
AT-S39 User’s Guide The following prompt is displayed: You are going to invoke the Xmodem download utility. Do you wish to continue? [Yes/No] 6. Type Y for Yes. The prompt “Downloading” is displayed. 7. Begin the file transfer of the new management software image. Note The transfer protocol must be Xmodem or 1K Xmodem. Steps 8 through 11 illustrate how you would transfer the file using the Hilgraeve HyperTerminal program. 8. From the HyperTerminal main window, select the Transfer menu.
Section II: Local and Telnet Management 10. Click on the Protocol field and select as the transfer protocol either Xmodem or, for a faster download, 1K XModem. 11. Click Send. The software immediately begins to download onto the switch. The Xmodem File Send window in Figure 51 displays current status of the software download. The download process takes a couple minutes to complete.
AT-S39 User’s Guide Downloading a Management Software Image Using TFTP The AT-S39 software comes with TFTP server software.
Section II: Local and Telnet Management Uploading a Configuration File The switch configuration information can be uploaded and saved to a file on a workstation. This file can then be used to restore the configuration information to the same switch or can be uploaded to other switches of the same family that need to be configured identically.
Section III Web Browser Management The chapters in this section explain how to manage an AT-8024 or AT-8024GB Fast Ethernet switch using a web browser.
Chapter 17 Starting a Web Browser Management Session This chapter contains the procedure for starting a management session on an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch using a web browser, such as Microsoft Internet Explorer or Netscape Navigator.
AT-S39 User’s Guide Starting a Web Browser Management Session This section explains how to start a web browser management session. Note In order for you to manage an AT-8024, AT-8024GB, or AT-8026FC switch using a web browser, the switch must have an IP address. Initially assigning an IP address to a switch can only be done through a local management session. For instructions, refer to Configuring an IP Address and Switch Name on page 34.
The window shown in Figure 53 is displayed. Figure 53 Home Page This is the Home page of the management software. In the left portion of the Home page is the main menu: ❑ Configuration ❑ Monitoring ❑ Exit Note A web browser management session remains active even if you link to other sites. You can return to the management web pages anytime as long as you do not quit the browser. Browser Tools You can use the browser tools to move around the Omega menus.
AT-S39 User’s Guide Quitting from a Web Browser Management Session To exit from a web browser management session, return to the Home page and select Exit from the main menu.
Chapter 18 Basic Switch Parameters This chapter contains the following sections: ❑ Configuring an IP Address and Switch Name on page 177 ❑ Activating the BOOTP and DHCP Services on page 181 ❑ Viewing System Information on page 182 ❑ Configuring the SNMP Parameters and Trap IP Addresses on page 184 ❑ Resetting a Switch on page 186 176
AT-S39 User’s Guide Configuring an IP Address and Switch Name Note For guidelines on when to assign an IP address, subnet address, and gateway address to an AT-8024 or AT-8024GB switch, refer to When Does a Switch Need an IP Address? on page 32. To set the basic switch parameters for an AT-8024 or AT-8024GB Fast Ethernet switch, perform the following procedure: 1. From the Home Page, select Configuration. The Configuration window is displayed with the System option selected by default. 2.
Section III: Web Browser Management The General tab in Figure 54 is displayed. Figure 54 General Tab Window - Configuration Note This procedure describes the parameters in the Administration section of the window. The parameters in the Configuration and Broadcast Storm Control sections are discussed later in this guide. Note The Reset button at the bottom of the window is used to reset the switch.
AT-S39 User’s Guide 3. Change the parameters as desired. The parameters are described below: System Name This parameter specifies a name for the switch (for example, Sales Ethernet switch). Entering a value for this parameter is optional. Note You should assign each switch a name. The names can help you identify the various switches in your network. This can help you avoid performing a configuration procedure on the wrong switch.
Section III: Web Browser Management Gateway address This parameter specifies the default router’s IP address. This address is required if you intend to remotely manage the switch from a management station that is separated from the switch by a router. 4. After you have set the parameters, click Apply. Your changes are not stored by the switch until you select Apply. 5. If you made a change to the IP address, subnet mask, or gateway address, you must reset the switch to activate your change.
AT-S39 User’s Guide Activating the BOOTP and DHCP Services For background information on BOOTP and DHCP, refer to the section Activating the BOOTP and DHCP Services on page 37. To activate or deactivate the BOOTP and DHCP protocols on the switch from a web browser management session, perform the following procedure: 1. From the Home Page, select Configuration. The Configuration window is displayed with the System option selected by default. 2.
Section III: Web Browser Management Viewing System Information To view basic information about the switch, perform the following procedure: 1. From the Home page, select Monitoring. 2. From the Monitoring menu, select System. 3. Select the General tab. The General tab window in Figure 55 is displayed.
AT-S39 User’s Guide This window is for viewing purposes only. You cannot change any of the values from this window. The sections in the window are defined below. General This section displays the switch’s serial number and the switch’s MAC address. These values cannot be changed. Administration This section contains a variety of information, including the IP address of the switch and the system name.
Section III: Web Browser Management Configuring the SNMP Parameters and Trap IP Addresses To change the switch’s SNMP community strings or to specify the IP addresses of management stations to receive traps from the switch, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration menu, select System. 3. Select the SNMP tab. The SNMP window in Figure 56 is displayed. Figure 56 SNMP Tab 4. Adjust the parameters as desired. The parameters are described below.
AT-S39 User’s Guide Trap Receiver 1 Trap Receiver 2 Trap Receiver 3 Trap Receiver 4 Use these selections to specify the IP addresses of up to four management workstations on your network to receive traps from the switch. 5. Click Apply to save your changes to the switch. Changes are immediately activated on the switch.
Section III: Web Browser Management Resetting a Switch To reset a switch, perform the following procedure: 1. From the Home Page, select Configuration. The Configuration window is displayed with the System option selected by default. 2. If the System menu option is not selected, select it and then select the General tab. 3. Click the Reset button at the bottom of the window. A confirmation prompt is displayed. 4. Click OK to reset the switch or Cancel to cancel the procedure.
Chapter 19 Port Parameters The procedures in this chapter allow you to view and change the parameter settings for the individual ports on a switch. Examples of port parameters that you can adjust include duplex mode and port speed.
Section III: Web Browser Management Configuring Port Parameters To configure the parameter settings for a port on a switch, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 1. 3. Select the Port Setting tab. The Port Setting tab is shown in Figure 57. Figure 57 Port Setting Configuration Tab 4. Click the port in the graphical switch image that you want to configure. The selected port turns white.
AT-S39 User’s Guide The Settings for Port window is displayed. An example of the window is shown in Figure 58. Figure 58 Settings for Port Window Note Clicking the Default button returns the port settings to the default values. Default values are listed in Appendix A, AT-S39 Default Settings on page 238. 6. Adjust the port parameters as desired. The parameters are described below. Disable Port You can use this check box to enable or disable a port. A disabled port will not accept or transmit frames.
Section III: Web Browser Management ❑ 100Mbps - Half Duplex ❑ 100Mbps - Full Duplex Broadcast Storm Control The maximum number of broadcast packets the port can receive within a specified period of time. If the threshold is reach, any additional broadcast packets received on the port are discarded by the switch. For background information on this feature, refer to Broadcast Frame Control Overview on page 152.
AT-S39 User’s Guide Displaying Port Status and Statistics The procedure in this section displays the operating status of the ports on a switch and port statistics. You can view a port’s operating speed, duplex mode, MDI/MDI-X configuration, and more. You can also view the operating status of any GBIC modules installed in an AT-8024GB. To display the status or statistics of a switch port, perform the following procedure: 1. From the Home page, select Monitoring. 2. From the Monitoring page, select Layer 1.
Section III: Web Browser Management If you select port status, the Port Status window in Figure 60 is displayed. Figure 60 Port Status Window The information in this window is for viewing purposes only. To adjust port parameters, refer to Configuring Port Parameters on page 188. The columns in the window are described below: Port The port number. Link The status of the link between the port and the end node connected to the port.
AT-S39 User’s Guide MDI The operating configuration of the port. Possible values are MDI and MDI-X. Speed The operating speed of the port. Possible values are: 0010 - 10 Mbps 0100 - 100 Mbps 1000 - 1000 Mbps Dplx The duplex mode of the port. Possible values are half-duplex and full-duplex. Flow Control The port’s flow control setting. Possible values are: None - No flow control on the port. Transmit - Flow control only on packets being transmitted out the port.
Section III: Web Browser Management Priority Level The priority queue to which untagged packets are directed when received on the port. A value of 1 to 3 directs untagged packets to the low priority queue while a value of 4 to 7 directs packets to the high priority queue. If the override priority feature has been activated on the port, tagged packets will be directed to the priority queue reflected by this status parameter.
AT-S39 User’s Guide Received Multicast Number of multicast packets received on the port. CRC Error Number of packets with a cyclic redundancy check (CRC) error but with the proper length (64-1518 bytes) received on the port Total Packets Number of packets received and transmitted on the port. Undersize Packets Number of packets that were less than the minimum length specified by IEEE 802.3 (64 bytes including the CRC) received on the port.
Chapter 20 Port Security This chapter explains how to display the current port security level on the switch from a web browser management session. Note For background information on port security, refer to Port Security Overview on page 65. Note A switch’s port security level can be changed only from a local management session.
AT-S39 User’s Guide Displaying the Port Security Level To display the switch’s port security level, perform the following procedure: 1. From the Home page, select Monitoring. 2. From the Configuration page, select Layer 2. 3. From the Layer 2 page, select the Port Security tab. The current security level is displayed.
Chapter 21 Port Trunks This chapter contains the procedure for creating or deleting a port trunk using a web browser management session. Note For background information on port trunking, refer to Port Trunking Overview on page 73.
AT-S39 User’s Guide Creating or Deleting a Port Trunk Caution Do not connect the cables of a port trunk to the ports on the switch until after you have configured the ports on both the switch and the end node. Connecting the cables prior to configuring the ports can create loops in your network topology. Loops can result in broadcast storms, which can adversely effect the operations of your network. If you are deleting a port trunk, disconnect the cables from the ports before you delete the trunk.
Section III: Web Browser Management 4. To create a port trunk, do the following: a. Click the ports that will make up the port trunk. A selected port changes to white. An unselected port is black. A port trunk can contain 2, 3, or 4 ports. b. Click Apply. The new port trunk is immediately activated on the switch. You can now connect the data cables to the ports of the trunk on the switch. 5. To delete a port trunk, do the following: a.
Chapter 22 Port Mirroring This chapter contains the procedure for creating or deleting a port mirror. Note For background information on port mirroring, refer to Port Mirroring Overview on page 79.
Section III: Web Browser Management Creating or Deleting a Port Mirror To create or delete a port mirror, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 1. 3. Select the Port Mirroring tab. The management software displays the Port Mirroring window in Figure 64. Figure 64 Port Mirroring Window 4. To create a port mirror, do the following: a.
AT-S39 User’s Guide 5. To disable port mirroring, select “None“ from the Mirroring Port pulldown menu and click Apply. The port mirror is deleted. The port that was functioning as the mirror port can now be used for normal network operations.
Chapter 23 Spanning Tree Protocol This chapter explains how to configure the STP bridge parameters on an AT-8024, AT-8024GB, or AT-8026FC Fast Ethernet Switch from a web browser management session. Sections in the chapter include: ❑ Configuring a Bridge or Port’s STP Settings on page 205 ❑ Displaying a Bridge or Port’s STP Settings on page 209 Note For background information on STP, refer to STP Overview on page 83.
AT-S39 User’s Guide Configuring a Bridge or Port’s STP Settings Caution STP on a bridge is disabled by default. If you enable STP, the bridge provides default STP parameters that are adequate for most networks. Changing them without prior experience and an understanding of how STP works might have a negative effect on your network. You should consult the IEEE 802.1d standard before changing any of the STP parameters. To configure a bridge or port’s STP parameters, perform the following procedure: 1.
Section III: Web Browser Management 4. To enable or disable STP on the switch, click the Enable STP check box. A check in the box indicates that STP is enabled on the switch. 5. Adjust the bridge STP settings as needed. The parameters are described below. Bridge Identifier The MAC address of the bridge. The bridge identifier is used as a tie breaker in the selection of the root bridge when two or more bridges have the same bridge priority value. This value cannot be changed.
AT-S39 User’s Guide Note The aging time for BPDUs is different from the aging time used by the MAC address table. 6. After you have made the desired changes, click Apply. 7. To adjust a port’s STP settings, click on the port in the switch image and click Modify. You can select more than one port at a time. The Port Spanning Tree Protocol window in Figure 66 is displayed. Figure 66 Spanning Tree Protocol Window - Port Configuration 8. Adjust the settings as desired. The parameters are described below.
Section III: Web Browser Management Bridge Hello Time The time interval between generating and sending configuration messages by the bridge. The default is 2 seconds. This value cannot be changed from this window. To change this value, refer to earlier in this procedure. Port State The current STP status of the port. A port’s STP status can be forwarding, listening, learning, or blocking. This setting cannot be changed.
AT-S39 User’s Guide Displaying a Bridge or Port’s STP Settings To display the STP settings, perform the following procedure: 1. From the Home page, select Monitoring. 2. From the Monitoring menu, select Layer 2. 3. From the Layer 2 page, select the Spanning Tree tab. The Spanning Tree window in Figure 67 is displayed. The information in this window is for viewing purposes only. To change the parameters or for definitions of the parameters, refer to Configuring a Bridge or Port’s STP Settings on page 205.
Chapter 24 Virtual LANs This chapter explains how to create, modify, and delete VLANs from a web browser management session. This chapter also explains how to change a switch’s VLAN operating mode. Note For background information on VLANs and on the Basic VLAN mode, refer to Chapter 10, Virtual LANs.
AT-S39 User’s Guide Creating a VLAN To create a new VLAN, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration menu, select Layer 2. 3. From the Layer 2 window, select the VLAN tab. The VLAN window in Figure 68 is displayed.
Section III: Web Browser Management 4. Click Add. The Add VLAN window in Figure 69 is displayed. Figure 69 Add VLAN Window 5. Select the Name field and enter a name for the new VLAN. The name can be from one to 10 characters in length. The name should reflect the function of the nodes of the VLAN (for example, Sales or Accounting). The name can contain spaces but not special characters, such as asterisks (*) or exclamation points (!).
AT-S39 User’s Guide example, if you are creating a VLAN called Sales that will span three switches, you must assign the same VID value to each Sales VLAN on the three switches. Note A VLAN must have a VID. 7. If you want all traffic received on the ports of the VLAN to be sent to the switch’s CPU, click Send to CPU. Note In most situations you should not activate this feature for a VLAN. 8.
Section III: Web Browser Management Note The untagged ports that you assign to the new VLAN are automatically removed from their current VLAN assignment. The VLAN is now ready for network operations.
AT-S39 User’s Guide Modifying a VLAN To modify a VLAN, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration menu, select Layer 2. 3. From the Layer 2 window, select the VLAN tab. The VLAN window in Figure 68 on page 211 is displayed. 4. Click the circle next to the name of the VLAN you want to modify. 5. Click Modify. The configuration window for the VLAN is displayed. 6.
Section III: Web Browser Management Deleting a VLAN To delete a VLAN from the switch, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration menu, select Layer 2. 3. From the Layer 2 window, select the VLAN tab. The VLAN window in Figure 68 on page 211 is displayed. 4. Click the circle next to the name of the VLAN you want to delete. 5. Click Remove. The VLAN is deleted from the switch.
AT-S39 User’s Guide Displaying VLANs To display all the existing VLANs on a switch, perform the following procedure: 1. From the Home page, select Monitoring. 2. From the Monitoring page, select Layer 2. 3. From the Layer 2 page, select the VLAN tab. The management software displays the window in Figure 70. The information in this window is for viewing purposes only.
Section III: Web Browser Management Setting the Switch’s VLAN Mode This section contains the procedure for setting a switch’s VLAN mode. You can configure a switch to support port-based and tagged VLANs or to operate in the Basic VLAN mode. Note Refer to Chapter 10, Virtual LANs, for descriptions of port-based and tagged VLANs and the Basic VLAN mode. To set the switch’s VLAN mode, perform the following procedure: 1. From the Home Page, select Configuration. 2. From the Configuration menu, choose System.
AT-S39 User’s Guide Enabling or Disabling VLANs This procedure performs exactly the same function as the previous procedure. It sets a switch’s VLAN mode. When VLANs are enabled, the switch supports port-based and tagged VLANs. When VLANs are disabled, the switch supports the Basic VLAN mode. The difference between the two procedures has to do with ingress filtering. If you activate the Basic VLAN Mode using the previous procedure, ingress filtering is disabled.
Section III: Web Browser Management Changing a PVID The procedure in this section explains how to change a PVID value for a port. As explained in Port-based VLAN Overview on page 93, a port receives a PVID when it is assigned as an untagged port to a VLAN. A port’s PVID will be the same as the VLAN’s VID to which it has been assigned. For example, if you assign Port 4 on the switch as an untagged port to a VLAN with a VID of 7, the port is assigned a PVID also of 7.
AT-S39 User’s Guide 6. Use the pull-down menu from the Port VLAN ID selection to specify the new PVID value for the port. The pull-down menu displays the VIDs of the VLANs existing on the switch. 7. Click Apply. The new value is immediately activated on the port. Note The Priority and Override Priority selections in the CoS Setting window are explained in Chapter 26, Class of Service on page 229.
Chapter 25 MAC Address Table This chapter contains instructions on how to view the dynamic and static addresses in the MAC address table of the switch. This chapter contains the following procedure: ❑ Viewing the MAC Address Table on page 223 ❑ Adding Static MAC Addresses on page 226 ❑ Deleting MAC Addresses on page 227 ❑ Changing the Aging Time on page 228 Note For background information on MAC addresses, refer to MAC Address Overview on page 128.
AT-S39 User’s Guide Viewing the MAC Address Table To view the MAC address table, perform the following procedure: 1. From the Home page, select either Configuration or Monitoring. 2. Select Layer 2. 3. From the Layer 2 page, select the MAC Address tab. The MAC Address window is displayed. Figure 72 shows how this window appears when you display it through the Configuration main menu selection.
Section III: Web Browser Management The options for displaying MAC addresses are described below. View All MAC Addresses This option displays both static and dynamic MAC addresses. View All Dynamic Addresses This option displays only dynamic MAC address. Dynamic MAC addresses are addresses that the switch has learned by examining the source addresses of frames received on the ports. View All Static Addresses This option displays only the static MAC addresses.
AT-S39 User’s Guide CPU Indicates whether the traffic received on the port is sent to the switch’s CPU. Yes indicates that the traffic is being sent to the CPU while No indicates it is not. MIR Indicates whether the traffic on the port is being mirrored. Yes means the traffic is being mirrored while No indicates that it is not. EMP Indicates whether multicast packets are being forwarded by ports in the blocking state. This feature is not supported at this time.
Section III: Web Browser Management Adding Static MAC Addresses You can assign up to 255 static MAC addresses per port on the switch. To add a static address to the MAC address table, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 2. 3. From the Layer 2 page, select the MAC Address tab. The MAC Address window in Figure 72 on page 223 is displayed. 4. In the MAC Address section of the window, enter the new static MAC address. 5.
AT-S39 User’s Guide Deleting MAC Addresses To delete a static or dynamic MAC address from the switch, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 2. 3. From the Layer 2 page, select the MAC Address tab. The MAC Address window in Figure 72 on page 223 is displayed. 4. Display the MAC addresses on the switch by selecting one of the options. For instructions, refer to Viewing the MAC Address Table on page 223. 5.
Section III: Web Browser Management Changing the Aging Time The switch uses the aging time to delete inactive dynamic MAC addresses from the MAC address table. When the switch detects that no packets have been sent to or received from a particular MAC address in the table after the period specified by the aging time, the switch deletes the address. This prevents the table from becoming full of addresses of nodes that are no longer active. The default setting for the aging time is 300 seconds (5 minutes).
Chapter 26 Class of Service This chapter contains instructions on how to configure CoS. This chapter contains the following procedure: ❑ Configuring CoS on page 230 Note For background information on CoS, refer to Class of Service Overview on page 141.
Section III: Web Browser Management Configuring CoS To configure CoS, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 2. 3. From the Layer 2 page, select the CoS tab. A graphical image of the switch is displayed. 4. Click the port where you want to configure CoS. You can select only one port at a time. A selected port turns white. (To deselect a port, click it again.) 5. Click Modify.
Chapter 27 IGMP Snooping This chapter contains instructions on how to configure the IGMP snooping feature on the switch. Note For background information on this feature, refer to IGMP Snooping Overview on page 144.
Section III: Web Browser Management Configuring IGMP Snooping To configure IGMP snooping from a web browser management session, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration menu, select System. 3. Select the IGMP tab. The IGMP tab in Figure 73 is displayed. Figure 73 IGMP Tab 4. Adjust the IGMP parameters as necessary. The parameters are explained below: Enable IGMP Snooping Status Enables and disables IGMP snooping on the switch.
AT-S39 User’s Guide Snoop Topology Defines whether there is only one host node per switch port or multiple host nodes per port. Possible settings are Edge (SingleHost/Port) and Intermediate (Multi-Host/Port). The Edge (Single-Host/Port) setting is appropriate when there is only one host node connected to each port on the switch.
Section III: Web Browser Management This parameter is useful with networks that contain a large number of multicast groups. You can use the parameter to prevent the switch’s MAC address table from filling up with multicast addresses, leaving no room for dynamic or static MAC addresses. The range is 1 address to 2048 addresses. The default is 256 multicast addresses. Multicast Router Port(s) Specifies the port on the switch to which the multicast router is detected.
Chapter 28 Broadcast Frame Control This chapter contains instructions on how to configure the broadcast frame control feature on the switch. Note For background information on this feature, refer to Broadcast Frame Control Overview on page 152.
Section III: Web Browser Management Configuring the Interval Timer The interval timer defines the time period used in counting the number of broadcast packets on a port. Broadcast frames exceeding the maximum number during the specified timer interval are discarded by the port and are not forwarded by the switch. You can specify a different interval timer for different port speeds. To specify an interval timer, perform the following procedure: 1. From the Home page, select Configuration.
AT-S39 User’s Guide Setting the Maximum Number of Broadcast Frames To set the maximum number of broadcast frames you want the ports on the switch to forward, perform the following procedure: 1. From the Home page, select Configuration. 2. From the Configuration page, select Layer 1. When you open the Layer 1 page, the Port Settings tab is selected by default. If it is not selected, select it now. 3.
Appendix A AT-S39 Default Settings This appendix lists the AT-S39 factory default settings. Settings Default IP Address Subnet Mask 0.0.0.0 255.255.0.0 Gateway Address System Name MAC Aging Time Community Strings Get Community String Set Community String Trap Community String Spanning Tree Protocol Status Bridge Priority Bridge Max Age Time Bridge Hello Time Bridge Forwarding Delay IGMP Snooping Status Topology Host/Router Time-out Interval Maximum Multicast Groups 0.0.0.
AT-S39 User’s Guide Settings Management Interface Password User Name (web browser session only) Time Out Value Twisted Pair Ports Status Duplex Mode Speed Flow Control Broadcast Packets Security VLANs Default VLAN Name VID Basic Mode Broadcast Frame Control 10 Mbps Interval Timer 100 Mbps Interval Timer 1000 Mbps Interval Timer RS232 Port Data Bits Stop Bits Parity Flow Control Data Rate Default admin (case-sensitive) manager 10 minutes Enabled Auto-negotiation Auto-negotiation Disabled Forwarded Automati
Index A aging time changing, 139, 228 defined, 129 AT-S39 default settings, 41, 238 AT-S39 software security, 43 AT-S39 software updates downloading from a local session, 165 downloading via TFTP, 169 obtaining, 164 AT-S39 version number, 45 Automatic port security level, 65 Auto-Negotiation, 59, 189 B Basic VLAN mode defined, 105 setting, 122, 218 BOOTP activating, 37, 181 defined, 37 BPDU, see bridge protocol data unit bridge forwarding delay parameter, 206 bridge hello time parameter, 206 bridge identif
AT-S39 User’s Guide G gateway address, 35, 180 H hello time, 85, 87, 208 host nodes defined, 144 displaying, 149 host/router timeout interval, 147, 233 I IEEE 802.
S Secure level, port security, 66 serial number, switch, 45 slave switch, defined, 50 SNMP community strings, 39, 184 SNMP management session, 21, 43 snoop topology, 146, 233 software updates downloading from a local session, 165 downloading via TFTP, 169 obtaining, 14, 164 Spanning Tree Protocol configuring bridge parameters, 86, 205 configuring port parameters, 88 defined, 83 port cost, 84, 89, 207 viewing bridge parameters, 209 starting session local, 24 Telnet, 29 web browser, 173 static MAC address add
