Configuring an IP helper address
To forward a client broadcast request for a UDP application when the client and server
are on different networks, you must configure a helper address on the interface connected
to the client.
- Enter the global configuration mode by issuing the
configure terminalcommand. - Enter the interface configuration mode.
- Add a helper address for the server.
The commands in the example above add a helper address for server 10.95.7.6 to the port. If the port receives a client request for any of the applications that the Layer 3 switch is enabled to forward, the Layer 3 switch forwards the client request to the server.
- By default, an IP helper does not forward client broadcast requests to a server within
the network. To forward a client broadcast request when the client and server are
on the same network, configure an IP helper with the unicast option on the interface
connected to the client.
The previous example configures an IP helper unicast option on unit 1, slot 1, port 2. The IP helper with unicast parameter forwards the client request to the server 10.10.10.1, which is within the network.