C3 Tx discards and Frame timeout due to weak RX on Brocade switch
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)
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 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)
-
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