Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 93)

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-15

• wfFDDIRingOverrunRx (get wfFddiEntry.21.*)

This shows the number of logical link control (LLC) reception ring

overrun events. These errors are equivalent to lack-of-resource errors on a

synchronous or Ethernet port. Each error indicates one lost packet.

Troubleshoot a problem with reception ring overruns as follows:

-- Enter the following command to verify how many buffers are

currently free in the slot:

get wfKernelEntry.*.

<slot>

-- Go to “Memory or Buffer Problem” in Chapter 3 if you need an

explanation of the memory issues.

-- Increase the size of the reception queue by setting the wfFddiEntry.43

attribute (wfFDDICfgRxQueueLength). The maximum setting is 255.

• wfFDDITxClipFrames (

get wfFddiEntry.40.*)

This shows the number of dropped (clipped) frames that the router could

not add to the driver’s transmission routine because of transmission

congestion. Determine what type of data is overrunning the transmission

port by using a network analyzer or the Packet Capture utility.

Enter the following command to verify how many buffers are currently

free in the slot:

get wfKernelEntry.*.

<slot>

Go to “Memory or Buffer Problem” in Chapter 3 for an explanation of the

memory issues.

Increase the size of the transmission queue by setting the wfFddiEntry.42

attribute (wfFDDICfgTxQueueLength). The maximum setting is 255.

Enter the Technician Interface command

get wfFddiSmtEntry.9.*

or use

the Quick Get path

wfLine > wfFddiGroup > wfFddiSmtGroup >

wfFddiSmtTable > wfFddiSmtCfState

This shows the connection of the station to the ring. The codes are as follows:

• 1 = isolated

•2=wrap S

•3=wrap A

•4=wrap B

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 267 268

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 93