Cisco: Configuring a Frame-Relay Switch

Posted September 29, 2004 by Headhunter in Cisco router

When you build a Cisco lab for home use, you can simulate a Frame-Relay cloud using a 2521, 2522, or 2600 series with an 8-port sync/async card.


Use the following steps to configure a Frame-Relay switch:

First, enable Frame-Relay switching on the router with the frame-relay switching global configuration command.

Then decide the type of interface you are going to have (i.e., DCE or DTE end). For example, if you want the Frame-Relay switch to be the DCE end for your network, use the following interface configuration command:
Router(config)#interface serial0
Router(config-if)#frame-relay intf-type dce

You can replace DCE with DTE or NNI if you decide to use that type of interface. This command has to be entered on all the intefaces that are part of our simulated Frame-Relay cloud.

Now, you need to set up the static routes for the Frame-Relay PVCs, using the following interface configuration command:
Router(config)#interface serial0
Router(config-if)#frame-relay route local_DLCI interface outgoing_interface outgoing_interface_DLCI

You can interpret the command as follows: All data from the local_DLCI on serial0 will be destined for the outgoing_interface_DLCI on the outgoing_interface.
The more PVCs you create, the more route statements you need when using a full mesh. You can also use a hub-and-spoke topology.

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