The show frame-relay pvc Command

The show frame-relay pvc command displays the status of each configured connection as
well as traffic statistics. As you’ll notice in the following router output, if you type the show
frame-relay pvc command, you’ll see all the PVCs that are configured on your router and
their status. You can also use a specific PVC number at the end of the command to see only that
particular PVC information:

Router_A#show frame-relay pvc
PVC Statistics for interface Serial0 (Frame Relay DTE)
DLCI = 160, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0
input pkts 7 output pkts 13 in bytes 2252
out bytes 1886 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 8 out bcast bytes 1366
pvc create time 00:06:54, last time pvc status changed 00:03:17
DLCI = 17, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0
input pkts 1 output pkts 7 in bytes 30
out bytes 832 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 7 out bcast bytes 832
pvc create time 00:01:59, last time pvc status changed 00:00:49
Router_A#

As you can see, the show frame-relay pvc command also shows you the number of BECN
and FECN packets received on the router. Please note that the BECN and FECN statistics are
per PVC, not across the entire router.

The show interface Command Network

The show interface command can be used with interface parameters, for example, show
interface serial 0. This provides information pertaining to just serial 0. By itself, the
show interface command provides information about all interfaces on the router.
The show interface command displays information regarding the encapsulation, layer 1 and
layer 2 status, and the LMI DLCI. In the following code, the show interface serial 0 command
is used. Notice the encapsulation is Frame Relay. The LMI information is shown as well.

Router#show interface serial0
Serial0 is up, line protocol is up
Hardware is HD64570
MTU 1500 bytes, BW 1544 Kbit,DLY 20000 usec,rely 255/255,load 1/255
Encapsulation FRAME-RELAY,loopback not set,keepalive set(10 sec)
LMI enq sent 0, LMI stat recvd 0, LMI upd recvd 0, DTE LMI down
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 1023 LMI type is CISCO frame relay DTE
FR SVC disabled, LAPF state down
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input never, output never, output hang never

Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 19 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=down DSR=down DTR=down RTS=down CTS=down
Router#

Notice that the LMI counter information is shown, as well as the LMI type, which is Cisco
by default. As you can see, this output shows both errors for the interface and the time that the
interface counters were last cleared.

Verifying Frame Relay

It is just as important to be able to verify Frame Relay as it is to be able to understand how to
configure it. In this section, you will learn about the various commands used to verify Frame
Relay. These include the following:

* show interface
* show frame-relay pvc
* show frame-relay map
* clear frame-relay-inarp
* show frame-relay lmi
* debug frame-relay lmi