- Hewlett-Packard Switch User Manual
Table Of Contents
- HP ProCurve 2520 Switches Management and Configuration Guide
- Front Cover
- Title Page
- Copyright, Notices, & Publication Data
- Contents
- Feature Index
- 1.Getting Started
- 2.Selecting a Management Interface
- 3.Using the Menu Interface
- 4.Using the Command Line Interface (CLI)
- 5.Using the ProCurve Web Browser Interface
- 6.Switch Memory and Configuration
- 7.Interface Access and System Information
- 8.Configuring IP Addressing
- 9.Time Protocols
- 10.Port Status and Configuration
- Contents
- Overview
- Viewing Port Status and Configuring Port Parameters
- Menu: Port Status and Configuration
- CLI: Viewing Port Status and Configuring Port Parameters
- Customizing the Show Interfaces Command
- Viewing Port Utilization Statistics
- Viewing Transceiver Status
- Enabling or Disabling Ports and Configuring Port Mode
- Enabling or Disabling Flow Control
- Configuring a Broadcast Limit on the Switch
- Configuring ProCurve Auto-MDIX
- Web: Viewing Port Status and Configuring Port Parameters
- Using Friendly (Optional) Port Names
- 11.Power Over Ethernet (PoE) Operation
- 12.Port Trunking
- Contents
- Overview
- Port Trunk Features and Operation
- Trunk Configuration Methods
- Menu: Viewing and Configuring a Static Trunk Group
- CLI: Viewing and Configuring Port Trunk Groups
- Web: Viewing Existing Port Trunk Groups
- Trunk Group Operation Using LACP
- Trunk Group Operation Using the “Trunk” Option
- How the Switch Lists Trunk Data
- Outbound Traffic Distribution Across Trunked Links
- 13.Configuring for Network Management Applications
- Contents
- Using SNMP Tools To Manage the Switch
- LLDP (Link-Layer Discovery Protocol)
- Terminology
- General LLDP Operation
- Packet Boundaries in a Network Topology
- Configuration Options
- Options for Reading LLDP Information Collected by the Switch
- LLDP and LLDP-MED Standards Compatibility
- LLDP Operating Rules
- Configuring LLDP Operation
- LLDP-MED (Media-Endpoint-Discovery)
- Displaying Advertisement Data
- LLDP Operating Notes
- LLDP and CDP Data Management
- A.File Transfers
- B.Monitoring and Analyzing Switch Operation
- Contents
- Overview
- Status and Counters Data
- Menu Access To Status and Counters
- General System Information
- Task Monitor—Collecting Processor Data
- Switch Management Address Information
- Port Status
- Viewing Port and Trunk Group Statistics and Flow Control Status
- Viewing the Switch’s MAC Address Tables
- Spanning Tree Protocol (MSTP) Information
- Internet Group Management Protocol (IGMP) Status
- VLAN Information
- Web Browser Interface Status Information
- Interface Monitoring Features
- Locating a Device
- C.Troubleshooting
- Contents
- Overview
- Troubleshooting Approaches
- Browser or Telnet Access Problems
- Unusual Network Activity
- General Problems
- 802.1Q Prioritization Problems
- IGMP-Related Problems
- LACP-Related Problems
- Port-Based Access Control (802.1X)-Related Problems
- QoS-Related Problems
- Radius-Related Problems
- Spanning-Tree Protocol (MSTP) and Fast-Uplink Problems
- SSH-Related Problems
- TACACS-Related Problems
- TimeP, SNTP, or Gateway Problems
- VLAN-Related Problems
- Fan Failure
- Using the Event Log for Troubleshooting Switch Problems
- Debug/Syslog Operation
- Debug/Syslog Messaging
- Debug/Syslog Destination Devices
- Debug/Syslog Configuration Commands
- Configuring Debug/Syslog Operation
- Debug Command
- Logging Command
- Adding a Description for a Syslog Server
- Adding a Priority Description
- Configuring the Severity Level for Event Log Messages Sent to a Syslog Server
- Operating Notes for Debug and Syslog
- Diagnostic Tools
- Viewing Switch Configuration and Operation
- Restoring the Factory-Default Configuration
- Restoring a Flash Image
- DNS Resolver
- D.MAC Address Management
- E.Daylight Savings Time on ProCurve Switches
- F.Power-Saving Features
- Index
- Notices & Publication Data
Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Syntax setmib lldpTxDelay.0 -i < 1 - 8192 >
Uses setmib to change the minimum time (delay-interval)
any LLDP port will delay advertising successive LLDP
advertisements due to a change in LLDP MIB content.
(Default: 2; Range: 1 - 8192)
Note: The LLDP refresh-interval (transmit interval) must be
greater than or equal to (4 x delay-interval). The switch does
not allow increasing the delay interval to a value that
conflicts with this relationship. That is, the switch displays
Inconsistent value if (4 x delay-interval) exceeds the current
transmit interval, and the command fails. Depending on the
current refresh-interval setting, it may be necessary to
increase the refresh-interval before using this command to
increase the delay-interval.
For example, to change the delay-interval from 2 seconds to 8 seconds when
the refresh-interval is at the default 30 seconds, you must first set the refresh-
interval to a minimum of 32 seconds (32 = 4 x 8).
Figure 13-16. Example of Changing the Transmit-Delay Interval
Attempt to change the transmit-delay
interval shows that the refresh-
interval is less than (4 x delay-interval).
Changes the refresh-interval to 32; that is:
32 = 4 x (desired transmit-delay interval)
Successfully changes the transmit-
delay interval to 8.
Changing the Reinitialization Delay Interval. In the default
configuration, a port receiving a disable command followed immediately by a
txonly, rxonly, or tx_rx command delays reinitializing for two seconds, during
which time LLDP operation remains disabled. If an active port is subjected to
frequent toggling between the LLDP disabled and enabled states, LLDP
advertisements are more frequently transmitted to the neighbor device. Also,
the neighbor table in the adjacent device will change more frequently, as it
deletes, then replaces LLDP data for the affected port which, in turn, generates
SNMP traps (if trap receivers and SNMP notification are configured). All of
this can unnecessarily increase network traffic. Extending the reinitialization-
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