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ProSafe XSM7224S Managed Stackable Switch CLI Manual, Software Version 9.0
Routing Commands 4-24
v1.0, November 2010
IP Helper Commands
This section describes the commands to configure a DHCP relay agent with multiple DHCP server
addresses per routing interface, and to use different server addresses for client packets arriving on
different interfaces on the relay agent.
ip helper-address (Global Config)
Use the Global Configuration ip helper-address command to have the switch forward User
Datagram Protocol (UDP) broadcasts received on an interface. To disable the forwarding of
broadcast packets to specific addresses, use the no form of this command.
The ip helper-address command forwards specific UDP broadcast from one interface to another.
You can define many helper addresses but the total number of address-port pairs is limited to 128
for the whole device. The setting of a helper address for a specific interface has precedence over a
setting of a helper address for all interfaces. You cannot enable forwarding of BOOTP/DHCP
packets (ports 67,68) with this command. If you want to relay BOOTP/DHCP packets, use the
DHCP relay commands.
Ip-address: Destination broadcast or host address to be used when forwarding UDP broadcasts.
You can specify 0.0.0.0 to indicate not to forward the UDP packet to any host and use
"255.255.255.255" to broadcast the UDP packets to all hosts on the target subnet.
udp-port-list: The broadcast packet destination UDP port number to forward. If not specified,
packets for the default services are forwarded to the helper address. Valid range, 0-65535.
no ip helper-address (Global Config)
Use this command to remove the IP address from the previously configured list. The no command
without an <
ip-address> argument removes the entire list of helper addresses on that interface.
Default Disabled
Format ip helper-address <ip-address>
{<1-65535>|dhcp|domain|isakmp|mobile-ip|nameserver|
netbios-dgm|netbios-ns|ntp|pim-auto-rip|rip|tacacs|tftp|time}
Mode Global Config