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What are CRC errors and how to resolve them with FC and Brocade switch running any version of Fabric OS

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Category:
fabric-interconnect-and-management-switches
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brocade
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Applies to

  • Brocade switch running any version of Fabric OS
  • SAN Protocol

Issue

This KB covers what CRC errors are on a switch, how to diagnose and how to resolve them. 

The "porterrshow" output on a switch will display CRC errors in the CRC field. 

     frames      enc    crc    crc    too    too    bad    enc   disc   link   loss   loss   frjt   fbsy  c3timeout
       tx     rx      in    err    g_eof  shrt   long   eof     out   c3    fail    sync   sig                 tx    rx
     ======================================================================================================================= 
  0:    7.5m   8.7m   0      0      0      0      0      0    316     30      4    506    612      0      0      0      0   
  1:    3.2g 716.8m   0     11     11      0      0      0     19     14      8     11     14      0      0      0      0   
  2:  415.9m   3.4g   1.7m 121.8k  84.2k  85      0     37.5k  59.8k   1.5k   6      9     12      0      0      1.5k   0   

Additionally, the host may experience random disconnects and/or latency.

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