Avaya Troubleshooting Routers Guía para resolver problemas descargar pdf (Pagina 103)

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-25

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.

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.

Refer to one of the following sections if it pertains to your problem:

•“Checking the Address Format (Nortel Networks Standard Only)

”

•“Troubleshooting a Synchronous to X.21 Connection

”

•“Reception Errors Incrementing or Reception Count Not Incrementing

”

•“Troubleshooting the Internal Clock Settings (Lab Environments Only)

”

Checking the Address Format (Nortel Networks Standard Only)

If the router is running Version 7.0 or later of the Nortel Networks Standard PPP,

and you defined explicit addressing, make sure the addresses are in decimal

format. (The addresses in a Series 5 router are in hexadecimal format.) If the

address is greater than 9 and in the wrong format, the synchronous link fails to

activate.

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Avaya Troubleshooting Routers Guía para resolver problemas Pagina 103