Reference Guide

(Extreme 220) #config
(Extreme 220) (Config) #ip helper-address 10.1.1.1 dhcp
(Extreme 220) (Config) #ip helper-address 10.1.2.1 dhcp
To relay UDP packets received on any interface for all default ports to the server at 20.1.1.1, use the
following commands:
(Extreme 220) #config
(Extreme 220) (Config) #ip helper-address 20.1.1.1
no ip helper-address (Global Config)
Use the no form of the command to delete an IP helper entry. The command no ip helper-address with
no arguments clears all global IP helper addresses.
Format 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]
Mode Global Config
ip helper-address (Interface Config)
Use this command to configure the relay of certain UDP broadcast packets received on a specific
interface or range of interfaces. This command can be invoked multiple times on a routing interface,
either to specify multiple server addresses for a given port number or to specify multiple port numbers
handled by a specific server.
Default
No helper addresses are configured.
Format ip helper-address {server-address | discard} [dest-udp-port |
dhcp | domain | isakmp | mobile ip | nameserver | netbios-dgm
| netbios-ns | ntp | pim-auto-rp | rip | tacacs | tftp |
time]
Mode Interface Config
Parameter Description
server-
address
The IPv4 unicast or directed broadcast address to which relayed UDP broadcast packets are
sent. The server address cannot be in a subnet on the interface where the relay entry is
configured, and cannot be an IP address configured on any interface of the local router.
discard Matching packets should be discarded rather than relayed, even if a global ip helper-address
configuration matches the packet.
Routing Commands
ExtremeSwitching 200 Series: Command Reference Guide for version 01 .02.04.0007 560