Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 83)

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-5

Dropped Frames

Troubleshoot dropped frames as follows:

Use the Events Manager or the Technician Interface to display the

attributes in Table 5-4

Redisplay the attributes in Tabl e 5- 4 after 1 minute; then, compare the

values to determine which errors are currently occurring.

Determine which upper-layer protocols configured to run on the same

port are receiving data.

Use Packet Capture and a network analyzer to determine which type of

data is on the line.

ATM VC Mod Failed Message

If the message

ATM VC mod failed appears, the VC request to the driver failed. The

message

VC ATM add failed usually appears next. Do the following:

Check the VC definition in the configuration file and make sure that you

defined the ATM adaptation layer (AAL) type as AAL 5.

Determine whether an oversubscription of the port cell rate occurred.

Make sure you used a VCI number greater than 32.

Table 5-4. Troubleshooting Dropped Frames

Attribute Description

wfAtmAlcDrvEntry.wfAtmAlcXmtPacketClips Shows whether the ATM port

is dropping frames because

of congestion on the outgoing

queue

wfAtmAlcCopDataPathEntry.wfAtmAlcCopRcvClipPackets Shows whether the ATM port

is dropping frames because

of congestion on the

incoming queue

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 83