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NetApp Knowledge Base

C3 Tx discards and Frame timeout events reported on Brocade switch

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

Brocade switch

Issue

  • Brocade switch shows the WARNING "Frame timeout detected".

Example:

2022/02/09-22:31:04, [AN-1014], 2266, SLOT 2 | FID 128, INFO, NFAB1, Frame timeout detected, tx port 9/7 rx port 9/27, sid c8f907, did 678740, timestamp 2022-02-09 22:31:04 .

  • "porterrshow" shows a large number C3 Tx discards on the affected port.

Example:

/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
391:   45.3g    3.4g    0       0       0       0       0       0       0      43.1k    5       0       5       0       0      43.1k    0       0       2.5k
 

 

  • "sfpshow" shows low Rx power on the affected port.

Example:

=============
Port  391:
=============
RX Power:    -8.1    dBm (155.8uW)
TX Power:    -3.0    dBm (500.6 uW)

 

  • Additionally, under portshow , we could see LR_IN > OLS_OUT, which again means the issue is with the end device.
    Please note that LR_IN will be set if the remote device initiates the link reset.

  • Example:
    portshow 391:

    Lr_in:             133     Ols_in:       5

    Lr_out:            7       Ols_out:      6 ​​​​​​​

 

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