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Occasional Contributor
Posts: 6
Registered: ‎11-24-2009

Brocade 48000 Stuck VC - what is it

Hi,

Looking forward your comments to understand stuck VC.Apreciate your response.

1)      What is stuck VC – An explanation - or a url to documenation

         -ve buffer credit issue and stuck VC, are they both same problem

2)      What causes for this condition  to occur

3)      How does it impact  switch performance- affected at port level or at switch level etc

4)       The -ve values on below o/p, how serious the issue is

5)      Is there any acceptable value  as indicated in the below command o/p

6)      What is the threshold value, as indicated in the below o/p to decide whether a CP reseat is necessary to clear stuck VC

7)      What is the penalty if the stuck VC condition is not addressed in time – will it eventually cause an outage/performance issues etc.

         Once these -ve values are accumulated does it clear on itsown or CP reseat is the only possible solution

FOS V6.4.1a

Asic CONDOR (6/1/0), Port Group(1/0): FC,  Poll# 1.
Counters                       0       1       2       3       4       5       6       7
========================================================================================
bbc_trc5                   0       1       0       0       1       0      -4       1  
bbc_trc6                   0       1       0       0       1       0      -1       1  
bbc_trc12                  0       1       0       0       1       0      -4       1  
bbc_trc16                  0       1       0       0       1       0      -4       1

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