What is a sysbol error?

Answered Question
Oct 8th, 2008
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In the output below there are 38 Symbol-Errs. What do they refer to?


ROC-6509-AS-C#sh int g7/43 counters errors


Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

Gi7/43 0 0 0 2 0 0


Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants

Gi7/43 0 0 0 0 0 2 0


Port SQETest-Err Deferred-Tx IntMacTx-Err IntMacRx-Err Symbol-Err

Gi7/43 0 0 0 0 38

Correct Answer by rmcarthur about 8 years 6 months ago

Gig ethernet uses 10 bit encoding instead of 8 bit. These 10 bit codes are referred to as symbols. Symbol errors can occur due to dirty fibre, noisy lines or, rarer, a hardware problem.

Unless they are increasing fairly quickly or regularly they are not a cause for concern.

Clear the counters, check your connections and monitor the situation.


Hope this helps.

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Correct Answer
rmcarthur Thu, 10/09/2008 - 05:02
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Gig ethernet uses 10 bit encoding instead of 8 bit. These 10 bit codes are referred to as symbols. Symbol errors can occur due to dirty fibre, noisy lines or, rarer, a hardware problem.

Unless they are increasing fairly quickly or regularly they are not a cause for concern.

Clear the counters, check your connections and monitor the situation.


Hope this helps.

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