DELL 8132 ユーザーズマニュアル

IP Helper/DHCP Relay Commands

Interface (VLAN) Configuration mode

Enable DHCP Relay using the ip helper enable command. The interface 

configuration always takes precedence over global configuration. However, if 

there is no interface configuration, then global configuration is followed.

The following example enables the circuit ID and remote agent ID options on 

vlan 10.

console(config)#interface vlan 10

console(config-if-vlan10)#ip dhcp relay information option-insert

Use the ip helper-address (global configuration) command to configure the 

relay of certain UDP broadcast packets received on any interface. To delete an 

IP helper entry, use the no form of this command.

ip helper-address 

server-address [dest-udp-port | dhcp | domain | isakmp | 

mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-auto-rp | rip 

| tacacs | tftp | time]
no ip helper-address [

server-address] [dest-udp-port | dhcp | domain | 

isakmp | mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-

auto-rp | rip | tacacs | tftp | time]

•

server-address — The IPv4 unicast or directed broadcast address to which 

relayed UDP broadcast packets are sent. The server address cannot be an 

IP address configured on any interface of the local router.

•

dest-udp-port — A destination UDP port number from 0 to 65535. 

•

port-name — The destination UDP port may be optionally specified by its 

name. Whether a port is specified by its number or its name has no effect 

on behavior. The names recognized are as follows: 

dhcp (port 67), domain 

2CSPC4.X8100-SWUM102.book  Page 1047  Friday, March 15, 2013  8:56 AM