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Chapter 7
Troubleshooting Serial Line and Frame Relay Connectivity
Problems and Action Plans
Table 7.6 includes the resolution action plans for the problems listed
in Table 7.5.
T A B L E 7 . 6
Action Plans for Common Frame Relay Problems
Problem
Resolution Action Plan
Faulty cabling
1. Check the cabling and use a breakout box
to test the control leads.
2. Replace cabling as needed.
Faulty hardware
1. You can isolate hardware problems by per-
forming loopback tests.
2. Change the cable to a new interface on the
router, and configure the new interface to
match the configuration of the old interface. If
the link comes up, you know that you must re-
place the hardware.
Local service provider
problem
1. If loopback tests bring the LMI state up, but
you cannot connect to the remote site, con-
tact the local carrier.
2. Problems can include carrier problems as
well as Frame Relay misconfiguration, such
as DLCI mismatch or encapsulation mis-
match.
LMI type mismatch
1. Verify that the LMI type on the router matches
the LMI type for every device in the PVC.
2. You won't have access to see the LMI infor-
mation inside a public provider network; you
need to contact the carrier.
Keepalive problems
1. Use the show interface command to see
whether keepalives are disabled or are
configured properly.
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