Dell Force10 Z9000, Reference Manual

Page: 767 / 1483

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.
E-Series, S4810
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 8.3.7.0 Introduced on the S4810.
Pre-version
8.3.7.0 Introduced on the E-Series ExaScale.
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 helper(s) on all interfaces.
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