Routing Commands
265
ProSafe Managed Switch
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.
clear ip helper statistics
Use this command to reset the statistics displayed in the show ip helper statistics
command to zero.
Format clear ip helper statistics
Mode
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.
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.
Default
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
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.
Format no 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
Privileged EXEC
Disabled
Global Config
GlobalConfig
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