PCS error reported on Brocade switch port with Rx and Tx well within the recommended range
Applies to
Brocade switches
Issue
- PCS errors observed on switch ports:
/fabos/cliexec/porterrshow : frames enc crc crc too too bad enc disc link loss loss c3timeout pcs uncor tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx err err 172: 276 165 0 3 2 0 0 1 0 0 2 0 2 0 0 89.7m 0
- Tx and RX power are well within the recommended range:
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Slot 5/Port 28:
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RX Power: -6.9 dBm (689.9uW)
TX Power: -1.1 dBm (784.2 uW)
- Below troubleshooting steps can be tried for isolating the issue:
- Reseat, clean the cable and SFP on either ends of the connectivity
- Clear switch stats (statsclear and
slotstatsclear
), and observe the port (usingporterrshow
) - If any further increment on the pcs err counters, perform hardware fault isolation for cable and sfp by following below steps:
- In order to do fault isolation if the hardware, move the cable to next available port on the switch end and observe for any increments:
- If the issues follows on new port, replace the cable/patch panel and verify the port counters
- If the issue does not follow to the new port, then swap the SFP of the affected port with a good known working SFP and see if the errors subsides