Avaya Troubleshooting Routers Guía para resolver problemas Pagina 101

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Troubleshooting a Data Link Layer Problem
117379-A Rev. A 5-23
wfSyncLackRescRx (get wfSyncEntry.42.*) and wfSyncLackRescRx
(
get wfSyncEntry.43.*)
This shows the number of times the router dropped frames it received
because of a lack of buffers or a lack of space on the transmission queue.
Some errors are likely, especially when the router boots. If this number
increases to a high rate (such as 15/minute) for an extended period, it may
indicate a problem.
Check the wfKernelEntry for the slot where the problem is occurring to
determine whether buffers are available. To do this, enter the command
get wfKernelEntry.*.
<slot>
. For example, enter the following command:
get wfKernelEntry.*.2. The router reports the number of available buffers
in slot 2. If buffers are available, something on the network is preventing
the router from updating its buffer lists.
Check for protocol storms (for example, from IP RIP, IPX RIP, and IPX
SAP, and learning bridge reconverging). If no buffers are available, check
the configuration of the line and the line utilization.
Increase the configured receive queue length
(wfSyncCfgRxQueueLength) to 64 and see if that alleviates the problem.
wfSyncUnderFlowTx (
get wfSyncEntry.44.*)
This shows the number of incomplete frames that the router transmitted
because the device queue was empty.
This problem usually occurs when you out-clock the router’s port. Certain
link modules (such as the DSDE 5430) support only a 600 KB aggregate
throughput. If the port is receiving a T1 clock signal, the link will be
operational, but underflow errors can occur.
3. Display and record these statistics, wait 1 minute, and repeat the
procedure.
Compare the statistics shown each time to determine whether the media is
currently experiencing problems. If the error statistics change, check the
reception and transmission statistics of the other ports in the same slot.
4. Refer to one of the following sections if it pertains to your problem:
Chec
king the Address Format (Bay Networks Standard Only)
T
roubleshooting a Synchronous to X.21 Connection
Rece
ption Errors Incrementing or Reception Count Not Incrementing
T
roubleshooting the Internal Clock Settings (Lab Environments Only)
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