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Chapter 7
Troubleshooting Serial Line and Frame Relay Connectivity
5.
Verify the Frame Relay PVCs.
6.
Verify the Frame Relay LMI.
7.
Verify the Frame Relay Map.
8.
Verify the loopback tests, as described in the CSU/DSU Loopback
Tests section.
The following commands describe how to execute each of these steps.
Frame Relay show Commands
Here is a list of the show commands that will be covered in this section:
show interface
show frame-relay lmi
show frame-relay pvc
show frame-relay map
You probably noticed a term you didn't recognize. LMI (Local Manage-
ment Interface) provides support for keepalive devices to verify data flow.
You will see this term a great deal when dealing with Frame Relay trouble-
shooting.
show interface
The show interface command is used to provide information on serial
lines. In addition to normal serial line information, Frame Relay information
is included in the output if the interface is configured for Frame Relay.
Line-by-line detail has already been given for a normal serial interface.
Therefore, only the fields relating to Frame Relay are listed. Here is a sample
of a Frame Relay interface output:
Router_A#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 823406, LMI stat recvd 823403, LMI upd
recvd 507, DTE LMI up
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