Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 97)

100

101

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-19

Frame Relay Configured with LMI Invokes an Xoff State

If a Frame Relay switch exceeds buffer thresholds and sends an R-bit, the router

invokes an Xoff state. Xoff is equivalent to a disabled VC. The router disables the

DLCI/VC that received the R-bit. If the DLCI that received the R-bit is in direct

mode, the router also disables all the upper-layer protocols associated with the

DLCI. If the DLCI is in group mode, the upper-layer protocols continue to run. In

this case, the protocols may reroute.

You cannot configure the router to ignore an Xoff state. FECNs and BECNs take

the place of Xoff.

If IP is available, use the Ping trace option to determine which Frame Relay node

is down.

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