Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 89)

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-11

• wfCSMACDBablErrorTx

This shows the number of frames transmitted that were larger than 1518

octets. BablErrorTx stands for babbling transmitter errors. Despite

declaring an error, the Ethernet controller chip transmits the packet in its

entirety.

Disable and enable the port and check the log for errors.

• wfCSMACDLcarTx

This shows the number of loss-of-carrier errors, which is the number of

times the port on the router lost the carrier connection during transmission

to an external transceiver device. After carrier loss, the Ethernet controller

chip continues to transmit the frame and the CSMACD entity logs an

event. The controller chip does not retransmit the frame.

This could indicate a bad transceiver cable, bad transceiver, or bad hub

port.

• wfCSMACDFcsErrorRx

This shows the number of frames dropped upon receipt over this

CSMA/CD line because the Ethernet controller chip detected a check

sequence (checksum) error. The cause is usually physical.

Make sure the cables are firmly connected. Test the cables.

• wfCSMACDAlignErrorRx

This shows the number of frames dropped upon receipt over this

CSMA/CD line because the Ethernet controller chip detected a frame

alignment error. An incoming frame contained a non-integer multiple of

eight bits and a checksum error. If an incoming frame contains a

non-integer multiple of eight bits, but does not have a checksum error, it

does not increase this count. When this count is incremented, the cause is

usually physical.

Make sure the cables are firmly connected. Test the cables.

• wfCSMACDLackRescErrorRx

This shows the number of receiver lack-of-resource errors. It indicates the

number of times the router dropped packets it received because of a lack

of buffers. 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.

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 89