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Switch User Manual

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42 An Introduction to IP Routing Protocols
Any of the Nortel Ethernet Routing Switch 5500 Series switch management
systems can be used to set DHCP.
DHCP relay
DHCP (Dynamic Host Configuration Protocol) is a mechanism to assign
network IP addresses to clients who request an address. It is built on top
of the existing BOOTP protocol and can be specified for DHCP, BOOTP,
or both.
The DHCP relay feature relays client requests to DHCP servers on different
L3 VLANs. It also relays server replies back to the clients.
DHCP relay can be configured through Command Line Interface or Java
Device Manager. DHCP can only be configured on the base unit from
CLI, like all L3 commands. There are three parts in the DHCP relay
configurations. They are:
•
global DHCP enable/disable
• interface configurations
•
forward path configurations
To relay DHCP messages, two VLANs must be created and IP addresses
assigned to them. The client and server must reside on different L3 VLANS
to use DHCP relay. IP routing and global DHCP relay must be enabled
on both the client as well as server.
Note: The DHCP Relay feature shares resources with QoS. If the
DHCP Relay feature is enabled, a QoS policy with a precedence of 11
cannot be installed.
For further information on QoS policies refer to Nortel Ethernet Routing
Switch 5500 Series Configuration - Quality of Service (Part Number
NN47200-504).
Global DHCP relay configuration This configuration enables or disables
DHCP relay for the entire unit or stack. Once DHCP relay is disabled, the
switch/stack will not relay DHCP/BOOTP " Global DHCP relay commands"
(page 42)across L3 VLANs. However, the settings will still be configurable.
describes the global DHCP relay commands.
Global DHCP relay commands
Command
Description
show ip dhcp-relay shows global DHCP relay state
no ip dhcp-relay disables DHCP relay globally
ip dhcp-relay enables DHCP relay globally
Nortel Ethernet Routing Switch 5500 Series
Configuration-IP Routing Protocols
NN47200-503 03.01 Standard
5.1 27 August 2007
Copyright © 2005-2007, Nortel Networks
.