Cisco IOS Cookbook, 2nd Edition

Adjusting LMI Options

Problem

You want to configure different LMI options on your Frame Relay circuit.

Solution

There are several different LMI options. The first specifies which version of LMI protocol you wish to use:

Branch1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Branch1(config)#interface Serial0
Branch1(config-if)#encapsulation frame-relay
Branch1(config-if)#frame-relay lmi-type ansi
Branch1(config-if)#exit
Branch1(config)#end
Branch1#

By default, LMI sends keepalive packets through every PVC every 10 seconds to verify that the path is still available. You can adjust this value with the keepalive command:

Branch1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Branch1(config)#interface Serial0
Branch1(config-if)#encapsulation frame-relay
Branch1(config-if)#keepalive 5
Branch1(config-if)#exit
Branch1(config)#end
Branch1#

LMI is not supported on all networks. If this is the case in your network, you must configure the router to announce its own DLCI number with the local-dlci command:

Branch1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Branch1(config)#interface Serial0
Branch1(config-if)#encapsulation frame-relay
Branch1(config-if)#frame-relay local-dlci 50
Branch1(config-if)#exit
Branch1(config)#end
Branch1#

Discussion

The first example in this recipe sets an alternative LMI type. By default, Cisco routers will attempt to detect the LMI type. There are three options. The first is ...