Chapter 30
| IP Interface Commands
IPv4 Interface
– 920 –
Example
This example enables forwarding for DHCPv6 UDP packets.
Console(config)#ip forward-protocol udp 547
Console(config)#
ip helper This command enables UDP helper globally on the switch. Use the no form to
disable this feature.
Syntax
[no] ip helper
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
â—† Network hosts occasionally use UDP broadcasts to determine information such
as address configuration, and domain name mapping. These broadcasts are
confined to the local subnet, either as an all hosts broadcast (all ones
broadcast - 255.255.255.255), or a directed subnet broadcast (such as
10.10.10.255). To reduce the number of application servers deployed in a multi-
segment network, UDP helper can be used to forward broadcast packets for
specified UDP application ports to remote servers located in another network
segment.
â—† To configure UDP helper, it must be enabled globally with the ip helper
command. The UDP destination ports for which broadcast traffic will be
forwarded must be specified with the ip forward-protocol udp command. And
the remote servers which are configured to service UDP clients on another
network segment specified with the ip helper-address command.
Example
This example enables UDP helper globally on the switch.
Console(config)#ip helper
Console(config)#
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