CLI Guide

Related
Commands
debug ip udp-helper — enables debug and displays the debug information on a
console.
show ip udp-helper — displays the configured UDP helpers on all interfaces.
ip udp-helper udp-port
Enable the UDP broadcast feature on an interface either for all UDP ports or a specified list of UDP ports.
Syntax
ip udp-helper udp-port [udp-port-list]
To disable the UDP broadcast on a port, use the no ip udp-helper udp-port
[udp-port-list] command.
Parameters
udp-port-list (OPTIONAL) Enter up to 16 comma-separated UDP port
numbers.
NOTE: If you do not use this option, all UDP ports are
considered by default.
Defaults none
Command Modes INTERFACE (config-if)
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
If you configure the ip helper-address command and ip udp-helper udp-
port command, the behavior is that the UDP broadcast traffic with port numbers
67/68 is unicast relayed to the DHCP server per the
ip helper-address
configuration. This occurs regardless if the ip udp-helper udp-port command
contains port numbers 67/68 or not.
If you only configure the ip udp-helper udp-port command, all the UDP
broadcast traffic is flooded, including ports 67/68 traffic if those ports are part of
the udp-port-list.
Related
Commands
ip helper-address — configures the destination broadcast or host address for the
DHCP server.
debug ip udp-helper — enables debug and displays the debug information on a
console.
show ip udp-helper — displays the configured UDP helpers on all interfaces.
Interfaces
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