User Manual
Table Of Contents
- Intended Readers
- Icons for Note, Caution, and Warning
- I. Product Overview
- I-1 . Product Brief Description
- I-2. Product Specification
- I-3. Hardware Description
- I-4. DIN-Rail Mounting
- /I-5. Console Connection
- The Console port is for local management by using a terminal emulator or a computer with terminal emulation software.
- DB9 connector connect to computer COM port
- Baud rate: 115200bps
- 8 data bits, 1 stop bit
- None Priority
- None flow control
- I-6. Connecting Cable
- II. Preparing for Management
- III. Web Management
- III-1. Web Management - Overview
- III-2. Web Management – Basic Settings
- III-3. Web Management – Redundancy
- III-4. Web Management – Management
- III-5. Web Management – L2 Switching
- III-6. Web Management – Security
- III-7. Web Management – Diagnostics
- III-8. Web Management – Monitoring
- III-9. Web Management – MAC Table
- III-10. Web Management – Maintenance
- Appendix A: IP Configuration for Your PC
- Appendix B: CLI Command Reference
- Revision History
- Federal Communication Commission Interference Statement
- R&TTE Compliance Statement
44
III-4-2. MANAGEMENT – DHCP
DHCP SERVER/CLIENT
DHCP, Dynamic Host Configuration Protocol, is a standardized protocol used in the IP networks. The
DHCP Server holds an IP address pool and when a DHCP Client request for an IP address, the DHCP
Server picks an IP address from the pool and assigns it to the client. DHCP Server also manages other IP
information such as Default Gateway and DNS Server. DHCP is very useful to configure the IP
information for a number of devices. Only the administrator can enable the DHCP Client for each device
and setup the DHCP Server. The clients will then obtain a unique IP address and other IP settings to
connect to the network.
DHCP
SERVER BINDING
Apart from dynamically allocating an IP address to a DHCP Client, the DHCP Server also provides a
function to manually assign a static IP address to the device with a specific MAC Address. This is called
as DHCP Server Binding.
DHCP
RELAY/OPTION82
In a large network, there might be several subnets existed and the DHCP Client is not able to serve by
DHCP Servers directly. In this case, we need a relay agent to help to transmit the request frames to the
DHCP Servers. When a relay agent receives the broadcast request frame from a DHCP Client, the relay
agent will transmit the frame to the DHCP Servers, which are in the same subnet by unicast.
Option 82 is an information option to identify the clients by Circuit ID and Remote ID. The Circuit ID is
an identity containing the interface name and/or VLAN information, and the Remote ID is to identify
the remote host (the relay agent). The DHCP Server can distribute an IP address to the DHCP Client
according to Option 82 information and make the IP addresses more controllable.
The frame format for the Circuit ID is as below:
•
VLAN
The VLAN field is for the management VLAN ID, which is natively set to 1.
•
Module
The stack number for the device sending the DHCP request is on. For industrial switches, this byte is
always filled as0.
•
Port
The port number identifies the incoming DHCP request frame/DHCP Client.
The frame format for the Remote ID is as below:
•
MAC Address
By default, the MAC address is set to the MAC address of DHCP relay agent.