Figure 8-32 gives a ?¬‚owchart for troubleshooting these issues.
Figure 8-32 Troubleshooting Connectivity Issues
Use the show interface serial number[/number] command to check the status of the Frame
Relay interface.
Which symptom
best describes
the problem?
Is the
Frame Relay
link down?
Troubleshoot a
Frame Relay
link that is down.
Troubleshoot
Frame Relay
remote router
connectivity.
Troubleshoot
Frame Relay
end-to-end
connectivity.
N
Y Y Y
N
Is there no
connectivity
with the remote
Frame Relay
router?
Is there
connectivity
end-to-end through
the Frame Relay
network?
Status of
show interface
serial
command?
Serial
interface down
and line protocol
down?
Troubleshoot
Frame Relay
remote router
connectivity.
Check for matching
LMI type
sh frame-relay lmi.
Check for matching
encapsulation type and
keepalive intervals.
Check for cable
sh controller
serial.
Loopback test to
troubleshoot
cable and hardware.
Check for
correct DLCI
sh frame-relay pvc.
N
Y Y Y
N
Serial
interface up
and line protocol
down?
Serial
interface up
and line protocol
up?
Troubleshooting Frame Relay WANs 349
If the output of the show interface serial command displays a status of ???interface down/
line protocol down,??? this typically indicates a problem at Layer 1, the physical layer.
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