Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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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.