Avaya Troubleshooting Routers Průvodce řešením problémů stáhnout pdf (Strana 85)

Troubleshooting a Data Link Connection Problem

5-7

• wfCSMACDOctetsRxOk

This shows the number of bytes received without error.

• wfCSMACDFramesRxOk

This shows the number of frames received without error.

• wfCSMACDOctetsTxOk

This shows the number of bytes transmitted without error.

• wfCSMACDFramesTxOk

This shows the number of frames transmitted without error.

• wfCSMACDDeferredTx

This shows the number of deferred transmissions. The Ethernet port

detected a frame transmitting on the segment when it was preparing to

transmit another frame. This is not an error, but an indication of a busy

segment. If this statistic changes rapidly, determine why the segment is so

busy.

• wfCSMACDLateCollnTx

This shows the number of late collisions transmitted. A late collision

transmission is a collision that takes place after the router transmits the

ﬁrst 64 bytes of a frame. The Ethernet Controller Chip (ILACC,

Integrated Local Area Communications Controller) does not retransmit

the frame. The length of the Ethernet cable exceeds the speciﬁed length.

Replace it with a compliant cable.

Late collisions may signify that the Ethernet LAN exceeds the length of

the 802.3 IEEE (Institute of Electrical and Electronic Engineers)

speciﬁcations.

• wfCSMACDExcessvCollnTx

This shows the number of excessive collisions. The software declares an

excessive collision when 16 successive attempts to transmit a frame fail

because each attempt results in a collision. The router discards the frame

and adds one to the error count.

This is an indication of an overloaded segment with possible storms of

data. Analyze this segment in order to determine what type of trafﬁc is

causing this problem.

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Avaya Troubleshooting Routers Průvodce řešením problémů Strana 85