Avaya Troubleshooting Routers Guia de Resolução de Problemas descarregar pdf (Página 98)

Troubleshooting Routers

5-20

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.

The possibility that some errors occur is 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 free buffers are available. To do this, enter

get

wfKernelEntry.*.

<slot>

. For example: get wfKernelEntry.*.2. The router

reports the number of available buffers in slot 2. If free 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 helps alleviate the

problem.

• wfSyncUnderFlowTx (

get wfSyncEntry.44.*)

This shows the number of incomplete frames that the router transmitted

because the device queue emptied.

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. 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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Avaya Troubleshooting Routers Guia de Resolução de Problemas Página 98