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C3 Tx discards and Frame timeout due to hardware issues

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Category:
fabric-interconnect-and-management-switches
Specialty:
brocade
Last Updated:

 

Applies to

Brocade Fabric OS 

Issue

  • errdump -a logs frame timeout, stating which port received a frame (rx) and where it cannot be transmitted on (tx) along with loss signal and oversubscribed alerts.

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 .
2023/12/23-10:47:16 (IST), [MAPS-1003], 274485, SLOT 2 | FID 128 | PORT 11/8, WARNING, switch, IB_INFINI_3185_W_N3P6, F-Port 11/8, Condition=ALL_PORTS(PORT_BANDWIDTH/NONE==OVERSUBSCRIBED), Current Value:[PORT_BANDWIDTH, OVERSUBSCRIBED, (TXQL=914 us, TX=72.8%) ], RuleName=defALL_PORTS_OVERSUBSCRIBED, Dashboard Category=Fabric Performance Impact, Quiet Time=15 min.
2023/12/18-01:35:43 (IST), [MAPS-1003], 270764, SLOT 1 | FID 128 | PORT 10/21, WARNING, switch, Nimble2_U_N2S3P1, U-Port 10/21, Condition=ALL_PORTS(LOSS_SIGNAL/min>5), Current Value:[LOSS_SIGNAL, 8 LOS], RuleName=defALL_PORTSLOSS_SIGNAL_5, Dashboard Category=Port Health, Quiet Time=None.

  • porterrshow shows link failures, link resets, c3 discards txand frame timeouts related error counter incrementing.

/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 indicates low receive power

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

  • sfpshow indicates Rx & Tx in optimal range

  • portshow indicates the remote device has resetted the link more than the local port sent OFFLINE primitives out

portshow 391
[...]
Lr_in:             133     Ols_in:       5
Lr_out:            7       Ols_out:      6

 

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