Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 91)

Troubleshooting a Data Link Layer Problem

308656-14.00 Rev 00

5-13

• wfCSMACDCerr

This shows the number of Ethernet controller chip collision detections.

This is meaningful only if the attached transceiver or hub device

implements an SQE (signal quality error, or Ethernet heartbeat) test as

defined in the IEEE 802.3 specification. SQE specifies the periodic

assertion of the transceiver’s collision detection circuitry during down

periods, and tests the integrity of the controller chip/transceiver

connection.

If the transceiver or hub device does not implement SQE, the value

(0 or 1) is irrelevant.

If the transceiver or hub device implements SQE:

-- 0 indicates successful completion of the test.

-- 1 indicates that the SQE test failed. In this case, CSMA/CD logs an

event noting SQE loss and verifies the integrity of the fuse. If the fuse

is the problem, CSMA/CD logs another event and disables service to

the line. If the fuse is OK, CSMA/CD retains service to the line.

• wfCSMACDTxClipFrames

This shows the number of frames clipped in the driver’s transmission

routine due to transmission congestion. Check for the type of data that is

transmitting. Determine whether a broadcast storm is disrupting the

network, or whether the traffic is too heavy for the segment.

• wfCSMACDRxReplenMisses

This shows the number of packet-buffer misses while attempting to

replenish the driver reception ring. Another entity is using all of the

available buffers. Go to “Memory or Buffer Problem” in Chapter 3.

• wfCSMACDUnAlignedFrames

This shows the number of non-word-aligned frames received for

transmission. A non-word-aligned frame means that the starting address

of the data in memory is not an even number. Some protocol

implementations in the router create non-word-aligned frames.

If the Ethernet controller is not a Quad Ethernet (QENET), you can ignore

this attribute. If the Ethernet controller is a QENET, check for underflow

errors or corrupted frames. (This usually occurs only when you configure

three or more ports on the QENET.)

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Avaya Troubleshooting Routers Průvodce řešením problémů Strana 91