Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 90)

Troubleshooting Routers

5-12

308656-14.00 Rev 00

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

determine whether buffers are available or whether something on the

network is preventing the router from updating its buffer lists. To do this,

use the command

get wfKernelEntry.*.

<slot>

. For example, enter the

command

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). Some lack-of-resource 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 or whether something on the

network is preventing the router from updating its buffer lists. To do this,

enter the command

get wfKernelEntry.*.

<slot>

. For example, enter the

command

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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