Cisco IOS Cookbook, 2nd Edition

Configuring Frame Relay SVCs

Problem

You want to configure the router to support Frame Relay SVCs.

Solution

Frame Relay SVCs are not extremely common, but some carrier networks support them. The advantage to using SVCs is that the router can add and remove inactive virtual circuits dynamically in a lightly used network. Because of the extra complexity and the management problems associated with dynamic network topologies, most network engineers will use this feature only if it offers significant cost advantages.

You can configure SVCs to use subinterfaces, as in Recipe 10.1:

Central#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Central(config)#interface Serial0
Central(config-if)#encapsulation frame-relay
Central(config-if)#frame-relay lmi-type q933a
Central(config-if)#frame-relay svc
Central(config-if)#exit
Central(config)#interface Serial0.10 point-to-point
Central(config-subif)#ip address 192.168.1.129 255.255.255.252
Central(config-subif)#frame-relay interface-dlci 100
Central(config-subif)#map-group SVCMAP
Central(config-fr-dlci)#class SVCclass
Central(config-fr-dlci)#exit
Central(config-subif)# exit
Central(config)#map-list SVCMAP source-addr X121 1234 dest-addr X121 4321
Central(config-map-list)#ip 192.168.55.6 class SVCclass ietf
Central(config-map-list)#exit
Central(config)#map-class frame-relay SVCclass
Central(config-map-class)#frame-relay traffic-rate 56000 128000
Central(config-map-class)#exit
Central(config)#end
Central#

And you can also ...