User guidelines, Example – Dell POWEREDGE M1000E User Manual

Page 908

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IP Helper/DHCP Relay Commands

User Guidelines

This command can be invoked multiple times on routing interface, either to

specify multiple server addresses for a given port number or to specify

multiple port numbers handled by a specific server.
The command no ip helper-address with no arguments clears all helper

addresses on the interface.

Example

To relay DHCP packets received on vlan 5 to two DHCP

servers, 192.168.10.1 and 192.168.20.1, use the

following commands:

console#config

console(config)#interface vlan 5

console(config-if-vlan5)#ip helper-address

192.168.10.1 dhcp

console(config-if-vlan5)#ip helper-address

192.168.20.1 dhcp

To relay both DHCP and DNS packets to 192.168.30.1, use the following

commands:

console#config

console(config)#interface vlan 5

console(config-if-vlan5)#ip helper-address

192.168.30.1 dhcp

console(config-if-vlan5)#ip helper-address

192.168.30.1 dns

This command takes precedence over an ip helper-

address command given in global configuration mode.

With the following configuration, the relay agent

relays DHCP packets received on any interface other

than vlan 5 and vlan 6 to 192.168.40.1, relays DHCP

2CSPC4.XModular-SWUM200.book Page 908 Thursday, March 10, 2011 11:18 AM

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