Avaya Troubleshooting Routers Guía para resolver problemas descargar pdf (Pagina 87)

Troubleshooting a Data Link Connection Problem

5-9

Check the wfKernelEntry for the slot where the problem is occurring to

determine whether free buffers are available, or to determine whether

something on the network is preventing the router from updating its buffer

lists. To do this, enter

get wfKernelEntry.*.

<slot>

. For example: get

wfKernelEntry.*.2. The router reports the number of available buffers in

slot 2.

Check for protocol storms (for example, from IP RIP, IPX RIP and SAP,

and learning bridge reconverging). If no buffers are available, check the

conﬁguration of the line and the line utilization.

Increase the wfCSMACDCfgRxQueueLength to 64, and see if that helps

alleviate the problem.

• wfCSMACDTooLongErrorTx

This shows the number of frames received that exceed 1518 octets. The

router drops the frames because of a lack of space on the transmission

queue (Tx). The possibility that some lack-of-resource 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, or to determine whether

something on the network is preventing the router from updating its buffer

lists. To do this, enter

get wfKernelEntry.*.

<slot>

. For example: get

wfKernelEntry.*.2. The router reports the number of available buffers in

slot 2.

Check for protocol storms (for example, from IP RIP, IPX RIP and SAP,

and learning bridge reconverging). If no buffers are available, check the

conﬁguration of the line and the line utilization.

Increase the wfCSMACDCfgRxQueueLength to 64, and see if that helps

alleviate the problem.

• wfCSMACDMerr

This shows the number of Ethernet controller chip memory errors. The

controller chip declares an error when it fails to access memory within

1512 clock ticks of asserting its data strobe signal. After declaring a

memory error, the controller chip reinitializes. Go to “Memory or Buffer

Problem” in Chapter 3.

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