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Link break detected on Fibre Channel target connected to Brocade switch due to faulty storage end sfp

Last Updated:

Applies to

  • ONTAP 9
  • FCP
  • Brocade Switch


  • EMS log on NetApp end reports a link reset event, where the link went down and came back up within 5 seconds.

Wed Feb 14 14:52:15 +0530 [NetApp1: fct_tpd_work_thread_0: scsitarget.slifct.linkBreak:error]: Link break detected on Fibre Channel target HBA 2c with event status 1 , topology type 1, status1 0x0, status2 0x0.
Wed Feb 14 14:52:20 +0530 [NetApp1: fct_tpd_work_thread_0: scsitarget.hwpfct.linkUp:notice]: Link up on Fibre Channel target adapter 2c.

Fibre Channel Target Adapter 2c
Received Optical Power - 996.9 (uWatts)
SFP Transmitted Optical Power - 992.0 (uWatts)

  • There are no other FCP events reported on the storage end around the issue time.
  • The connected switch port does not report any errors reported under porterrshow output-

/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
75:  242.2k  398.3k    0       0       0       0       0       0       0       0       0       0       0       0       0       0       0       0       0


  • The state of the switch port is up and online.

/fabos/bin/switchshow :
Index Slot Port Address Media  Speed        State    Proto
75    9   11   654bxx   id    N32   Online      FC  F-Port  1 N Port + 1 NPIV public


  • Errdump does not have any such erroneous events reported during the issue time.
  • Fabriclog output shows the switch port connected to the affected storage port encountered a reset.

Switch 0; Wed Feb 14 14:51:40 2024 IST (GMT+5:30)
14:51:40.025111 SCN Port Offline;rsn=0x2,g=0x6a             D0,P0  D0,P0  75    NA
14:51:40.025118 *Removing all nodes from port               D0,P0  D0,P0  75    NA
14:51:44.795477 SCN LR_PORT(0);g=0x6a                       D0,P0  D0,P0  75    NA
14:51:44.858285 SCN Port Online; g=0x6a,isolated=0          D0,P0  D0,P1  75    NA
14:51:44.858365 Port Elp engaged                            D0,P1  D0,P0  75    NA
14:51:44.858377 *Removing all nodes from port               D0,P0  D0,P0  75    NA
14:51:44.858608 SCN Port F_PORT                             D0,P1  D0,P0  75    NA
14:51:44.968592 SCN LR_PORT(0);g=0x6a LR_IN                 D0,P0  D0,P0  75    NA


  • Sfp Tx power looks very good on the switch end, which tells us that the switch sfp is in a good condition.
  • The Rx power is very low ((572.5uW)compared to the Tx power (1238.9 uW) on the switch end.

Slot  9/Port 11:
RX Power:    -2.4    dBm (572.5uW)
TX Power:    0.9     dBm (1238.9 uW)

  • Whereas, the storage end Tx power is SFP Transmitted Optical Power - 992.0 (uWatts)
  • This tells us that the issue lies somewhere upstream to the switch, which could be the cable or end device sfp ( NetApp storage in this scenario).


  • Cable testing needs to be performed to further isolate if the issue is faulty cable.
  • If the cable is good, then sfp on end device connected to switch has to be swapped.


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