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Cisco IOS Cookbook, 2nd Edition by Ian Brown, Kevin Dooley

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Viewing Frame Relay Status Information

Problem

You want to check the status of a Frame Relay circuit or VC.

Solution

There are several useful show commands for looking at Frame Relay circuits and virtual circuits. It is usually best to start at the physical layer and work upward through the protocol layers. You can look at the physical interface with the show interfaces command:

Central#show interfaces Serial0 

The show frame-relay pvc command allows you to see information about each of your Frame Relay PVCs:

Central#show frame-relay pvc

And sometimes it is also useful to look at the LMI status:

Central#show frame-relay lmi

Discussion

The show interfaces command has a lot of useful information. When the interface is configured for Frame Relay, this command shows the LMI configuration, whether the interface is configured for SVCs as well as PVCs, and it also shows you whether the interface is set up to be DCE or DTE. But the most important thing to look at is always the first line, where it shows the physical and the protocol status:

Central#show interfaces Serial0  Serial0 is up, line protocol is up Hardware is HD64570 Description: Frame Relay connection MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, reliability 255/255, txload 3/255, rxload 3/255 Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec) LMI enq sent 263, LMI stat recvd 263, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 0 LMI type is CCITT frame relay DTE FR SVC enabled, LAPF ...

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