ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv4 Interface
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COMMAND USAGE
Up to 100 UDP ports can be specified with this command for forwarding to
one or more remote servers.
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
◆ 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.
◆ 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)#