608 IP Helper Commands
Command Mode
Interface Configuration (VLAN) mode.
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
and DNS packets received on vlan 5 to 192.168.40.2, relays SNMP
traps (port 162) received on interface vlan 6 to 192.168.23.1, and
drops DHCP packets received on vlan 6:
console#config
console(config)#ip helper-address 192.168.40.1 dhcp
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