Command Reference Guide

644 | Interfaces
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ip udp-helper udp-port
e
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
Defaults
No default behavior or values
Command Modes
INTERFACE (config-if)
Usage
Information
If the ip helper-address command and ip udp-helper udp-port command are configured, the
behavior is that the UDP broadcast traffic with port numbers 67/68 will be unicast relayed to
the DHCP server per the
ip helper-address configuration. This will occur regardless if the ip
udp-helper udp-port
command contains port numbers 67/68 or not.
If only the
ip udp-helper udp-port command is configured, all the UDP broadcast traffic is
flooded, including ports 67/68 traffic if those ports are part of the
udp-port-list.
Command
History
Related
Commands
udp-port-list
(OPTIONAL) Enter up to 16 comma separated UDP port numbers.
Note: If this option is not used, all UDP Ports are considered by default.
Version 8.3.7.0 Introduced on S4810
Pre-version 8.3.7.0 Introduced on E-Series ExaScale
ip helper-address Configure the destination broadcast or host address for DHCP server.
debug ip udp-helper Enable debug and display the debug information on a console.
show ip udp-helper Display the configured UDP helper(s) on all interfaces.