Command Reference Guide

IP Helper Commands
CLI Command Reference
September 2014 Page 550
HP Moonshot Switch Module CLI Command Reference
Example: To relay DHCP packets received on interface 1/0/2 to two DHCP servers, 192.168.10.1 and
192.168.20.1, use the following commands:
(Routing)#config
(Routing)(config)#interface 1/0/2
(Routing)(interface 1/0/2)#ip helper-address 192.168.10.1 dhcp
(Routing)(interface 1/0/2)#ip helper-address 192.168.20.1 dhcp
Example: To relay both DHCP and DNS packets to 192.168.30.1, use the following commands:
(Routing)#config
(Routing)(config)#interface 1/0/2
(Routing)(interface 1/0/2)#ip helper-address 192.168.30.1 dhcp
(Routing)(interface 1/0/2)#ip helper-address 192.168.30.1 dns
Example: 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 1/0/2 and 1/0/17 to 192.168.40.1, relays DHCP and DNS packets received on 1/0/2 to
192.168.40.2, relays SNMP traps (port 162) received on interface 1/0/17 to 192.168.23.1, and drops DHCP
packets received on 1/0/17:
(Routing)#config
(Routing)(config)#ip helper-address 192.168.40.1 dhcp
(Routing)(config)#interface 1/0/2
(Routing)(interface 1/0/2)#ip helper-address 192.168.40.2 dhcp
(Routing)(interface 1/0/2)#ip helper-address 192.168.40.2 domain
(Routing)(interface 1/0/2)#exit
(Routing)(config)#interface 1/0/17
(Routing)(interface 1/0/17)#ip helper-address 192.168.23.1 162
(Routing)(interface 1/0/17)#ip helper-address discard dhcp
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 (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)
•time (port 37)
Other ports must be specified by number.
Parameter Description