
Troubleshooting a Data Link Connection Problem
5-15
Frame Relay Switch Keeps Marking the Circuit as Down
Troubleshoot as follows:
1. Check the polling interval configuration on the switch and router.
2. Check the log for any events issued by Frame Relay to determine the
status of the Frame Relay link.
Frame Relay Circuit Up, but Protocol Data Is Not Transmitting
Troubleshoot as follows:
1. Check the DLCI (data link control identifier) protocol configuration.
2. Check the routing tables for the correct routing information.
3. Check to see whether this problem is affecting all protocols or a single
one.
4. Examine the FrVcError statistics to determine whether the router is
dropping any packets.
5. Display the values of the VcCircuitEntry in order to determine whether
the switch initiated flow control.
6. Display the wfFrVCircuitEntry values and check the number of FECNs
(Forward Explicit Congestion Notifications) and BECNs (Backward
Explicit Congestion Notifications).
The attribute names for FECNs and BECNs are wfFrCircuitReceivedFECNs
and wfFrCircuitReceivedBECNs. The FECNs and BECNs indicate
congestion on the network.
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