Avaya Troubleshooting Routers Guía para resolver problemas descargar pdf (Pagina 96)

Troubleshooting Routers

5-18

308656-14.00 Rev 00

Frame Relay Switch Keeps Marking the Circuit as Down

Troubleshoot as follows:

Check the polling interval configuration on the switch and the router.

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:

Check the data link control identifier (DLCI) protocol configuration.

Check the routing tables for the correct routing information.

Check whether this problem is affecting all protocols or a single protocol.

Examine the FrVcError statistics to determine whether the router is

dropping any packets.

Display the values of the VcCircuitEntry object to determine whether the

switch initiated flow control.

Display the wfFrVCircuitEntry values and check the number of forward

explicit congestion notifications and backward explicit congestion

notifications (FECNs/BECNs).

The attribute names for FECNs and BECNs are wfFrCircuitReceivedFECNs

and wfFrCircuitReceivedBECNs. The FECNs and BECNs indicate

congestion on the network.

PVC Transmitting, but Not Receiving

If the log indicates that the permanent virtual circuit (PVC) is active, and the

statistics indicate that it is transmitting but not receiving, do the following:

• Make sure that the Frame Relay switch on the remote side of the link supports

the A-bit.

• The switch sends the A-bit to the router to indicate that it is up and active. If

the switch does not support the A-bit, the router has no way of determining

whether the remote side of the link is down, and thus fails to disable the

associated PVC.

• Determine whether the switch can loop back any data.

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Avaya Troubleshooting Routers Guía para resolver problemas Pagina 96