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PCS error and uncorrectable errors reported on Brocade E-ports

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

Brocade switches

Issue

  • PCS and Uncor errors observed on ISL ports under porterrshow on Brocade Switch:

/fabos/cliexec/porterrshow:
          frames      enc    crc    crc    too    too    bad    enc   disc   link   loss   loss   frjt   fbsy  c3timeout    pcs    uncor
       tx     rx      in    err    g_eof  shrt   long   eof     out   c3    fail    sync   sig                  tx    rx     err    err

 47:  117.2m 543.3m   0      0      0      0      0      0      0      0      0      0      0      0      0      0      0     12.4k   1.9k
 

/fabos/bin/switchshow:
  47  47   022f00   id    N16      Online      FC  LE E-Port  10:00:88:94:71:9d:xx:xx "SWITCH" (downstream)

  • The ISL port of the switch is flapping.
  • Low RX power reported: 

=============
Port 47:
=============
RX Power:    -17.7   dBm (17.0 uW)
TX Power:    -0.4    dBm (906.6 uW)

 

  • Check the Rx power on the switch end under sfpshow and ensure that the Rx power is within the recommended range.
  • Low Rx power indicates and issue upstream to the switch, refer Low Rx power reported on Brocade Siwtch due to Faulty cable.
  • Alternatively,  plug into a known good device for fault isolation ​​​​​​. 
  • Clear switch stats (statsclear and slotstatsclear), and observe the port (using porterrshow ) to further verify if the errors are still getting logged.
  • Proceed to the solution if the error persists.

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