Reference Guide

Command
Modes
INTERFACE (config-if)
Command
History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
When a UDP broadcast packet is flooded out of an interface, and the outgoing
interface is configured using this command, the outgoing packet’s IP destination
address is replaced with the configured broadcast address.
Related
Commands
debug ip udp-helper – enables debug and displays the debug information on a
console.
show ip udp-helper – displays the configured UDP helper(s) 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.
S5000
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)
Command
History
Version 9.0(1.3) Introduced on the S5000.
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.
572
Interfaces