Avaya Troubleshooting Routers Troubleshooting Guide Page 97

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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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