Use this command to configure the relay of certain UDP broadcast packets received on any interface. This command can be invoked multiple times, either to specify multiple server addresses for a given UDP port number or to specify multiple UDP port numbers handled by a specific server.
| Default | No helper addresses are configured. |
| Format | 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 |
|
| Parameter | Description |
|---|---|
| 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:
Other ports must be specified by number. |
To relay DHCP (Dynamic Host Configuration Protocol) packets received on any interface to two DHCP servers, 10.1.1.1 and 10.1.2.1, use the following commands:
(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
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