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Routing Commands
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ProSafe M4100 and M7100 Managed Switches
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. V
alid 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
ip helper enable
Use this command to enable relay of UDP packets. This command can be used to
temporarily disable IP helper without deleting all IP helper addresses. This command
replaces the
bootpdhcprelay enable command, but affects not only relay of DHCP
packets, but also relay of any other protocols for which an IP helper address has been
configured.
Default
Format ip helper enable
Mode
no ip helper enable
Use this command to disable relay of all UDP packets.
Format no ip helper enable
Mode
Disabled
Global Config
GlobalConfig
disabled
Global Config
Global Config