IP Helper/DHCP Relay Commands 1037console(config)#interface vlan 10console(config-if-vlan10)#ip dhcp relay information option-insertip helper-address (global configuration)Use the ip helper-address (global configuration) command to configure therelay of certain UDP broadcast packets received on any interface. To delete anIP helper entry, use the no form of this command.Syntaxip helper-addressserver-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 whichrelayed UDP broadcast packets are sent. The server address cannot be anIP 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 itsname. Whether a port is specified by its number or its name has no effecton behavior. The names recognized are as follows: dhcp (port 67), domain(port 53), isakmp (port 500), mobile-ip (port 434), nameserver (port 42),netbios-dgm (port 138), netbios-ns (port 137), ntp (port 123), pim-auto-rp (port 496), rip (port 520), tacacs (port 49), tftp (port 69), and time(port 37). Other ports must be specified by number.Default ConfigurationNo helper addresses are configured.Command ModeGlobal Configuration mode.
