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Laser_Flt error reported on Brocade switch port

Last Updated:

Applies to

Brocade X7 Switch


  • Laser_Flt reported on switch port under switchshow:

/fabos/bin/switchshow :
Index Slot Port Address Media  Speed        State    Proto

128    4   32   6f8000   id    N32       Laser_Flt   FC


  • Errdump reports below event:

2023/05/15-08:47:07 (IST), [C5-1001], 384913, SLOT 1 | CHASSIS | PORT 4/32, ERROR, SWITCH, S4,P32(Bp1) user_idx:128 [PID 0x6f80xx] faulted due to invalid SFP, conflicting speed or laser fault. Check if the SFP or port speed is valid for the configuration.


  • sfpshow output reports the Tx power as -inf and very low Rx power.

Slot  4/Port 32:
RX Power:    -34.0   dBm (0.4  uW)
TX Power:    -inf    dBm (0.0   uW)


  • Below troubleshooting steps tried to isolate the issue further:
  1. Replaced switch end sfp.
  2. Moved the cable from the affected port ( in this example 4/32) to a free working port and observed that the Rx/Tx power is optimal on the new port indicating the cable is working fine.
  3. On port 4/32 even when no cable was connected, the status was showing as laser_flt error
  4. Swapped sfp from a working port to affected port (4/32 in this example) and the port status was still the same i.e laser_flt indicating there is no issues with sfp.
  5. In order to further isolate the issue further, remove the SFP on the affected port and examine the receptacle of the blade that usually houses it.
  6. Post that check for debris, and maybe try to use compressed air to clean it
  7. Replace with the same SFP on port 4/32 and check the port status.
  8. If the laser_flt is still not cleared, then the blade in slot 4 will need to be replaced.


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