Avaya Troubleshooting Routers Guia de Resolução de Problemas descarregar pdf (Página 82)

Troubleshooting Routers

5-4

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

•“Dr

opped Frames”

•“A

TM VC . . . Failed Message”

•“Upper

-Layer Protocols Failing to Pass Packets”

Dropped Frames

Troubleshoot as follows:

1. Enter the following command to display the value of the

wfAtmAlcXmtPacketClips attribute:

get wfAtmAlcDrvEntry.29.*

Enter this command again in 1 minute to determine whether the ATM

port is dropping frames because of congestion on the outgoing queue.

3. Enter the following command to display the value of the

wfAtmAlcCopRcvClipPackets attribute:

get wfAtmAlcCopDataPathEntry.11.*

Enter this command again in 1 minute to determine whether the ATM

port is dropping frames because of congestion on the incoming queue.

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

port are receiving data.

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

data is on the line.

ATM VC . . . Failed Message

If the message “ATM VC mod failed” appears, the VC (virtual circuit) request to

the driver failed. The message “VC ATM add failed” usually appears afterwards.

Do the following.

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

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

2. Determine whether an oversubscription of the port cell rate occurred.

3. Make sure you used a VCI (Virtual Channel Identiﬁer) number greater

than 32.

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Avaya Troubleshooting Routers Guia de Resolução de Problemas Página 82