FC Target port flaps and goes to "link not connected" state

Applies to

• ONTAP 9.x
• FCP

Issue

• Intermittent link break events observed on the FC target port under EMS, post which the FC port resets itself:

Sun Nov 27 20:53:54 EST [NetApp: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:10a IO WQE failure, Handle 0xa, Type 8, S_ID: 11900, VPI: 3, OX_ID: 3F4, Status 0x3 Ext_Status 0x16
Sun Nov 27 22:04:06 EST [NetApp-05: fct_tpd_work_thread_0: scsitarget.slifct.linkBreak:error]: Link break detected on Fibre Channel target HBA 10a with event status 1 , topology type 1, status1 0x0, status2 0x0.
Sun Nov 27 22:04:24 EST [NetApp-05: fct_tpd_work_thread_0: scsitarget.hwpfct.linkUp:notice]: Link up on Fibre Channel target adapter 10a.
Sun Nov 27 22:04:31 EST [NetApp-05: fct_tpd_work_thread_0: scsitarget.slifct.wqeError:debug]: FC port 10a has a WQE processing failure of type SLI_ELS_REQ, command PLOGI, subtype x0, with status of 3 and an extended status x2 for NPIV port 0.
Sun Nov 27 22:04:49 EST [NetApp-05: fct_tpd_work_thread_0: scsitarget.hwpfct.errorReset:notice]: An error was encountered in the FC target driver on Fibre Channel target adapter 10a. The adapter will be automatically reset to clear the PLOGI failed for base port error (Status: 3 Extended status: 2 Index: 1) condition.
Sun Nov 27 22:04:49 EST [NetApp-05: fct_tpd_thread_10: fcp.io.status:debug]: STIO Adapter 10a resetting with 0 ITNs and 0 commands to drain
Sun Nov 27 22:04:49 EST [NetApp-05: fct_tpd_thread_10: scsitarget.fct.reset:notice]: Resetting Fibre Channel target adapter 10a.

• ASUP SYSCONFIG-A.XML FC port status shows as Link Not Connected

 slot 10: Fibre Channel Target Host Adapter 10a
                (Emulex LPe32000 (LPe32002) rev. 12, <LINK NOT CONNECTED>)
                Board Name:        111-03249
                Serial Number:     FC72662464
                Firmware rev:      11.2.219.4
                Host Port Addr:    000000
                FC Nodename:       50:0a:09:80:80:44:6d:80 (500a098080446d80)
                FC Portname:       50:0a:09:83:a0:44:6d:80 (500a0983a0446d80)
                Connection:        No link
                Switch Port:       Unknown
		SFP Vendor Name:   FINISAR CORP.
		SFP Vendor P/N:    FTLF8532P4BCV-EM
		SFP Vendor Rev:    A
		SFP Serial No.:    PXQ1M94
		SFP Connector:     LC
		SFP Capabilities:  8, 16, 32 Gbit/Sec

• ASUP: FCP Target Adapter TX power is in expected range under FCP-ADAPTER.XML

Received Optical Power    573.3 (uWatts)
SPF Transmitted Optical Power    798.0 (uWatts)

• ASUP: FCP Target Adapter RX power is degrading in comparison with previous ASUPs under FCP-ADAPTER.XML as per SFP Tx and Rx power 

Latest:
Received Optical Power    415.8 (uWatts)
SPF Transmitted Optical Power    798.0 (uWatts)

Previous:
Received Optical Power    573.3 (uWatts)
SPF Transmitted Optical Power    798.0 (uWatts)

• Review Tx power on the connected switch port using ​​​​​​ sfpshow command
• Low SFP Tx power on switch port

Sfpshow:
=============
Port 12:
=============
Identifier:  3    SFP
Connector:   7    LC
Transceiver: 6804404000000000 8,16,32_Gbps M5 sw Short_dist
Encoding:    6    64B66B
Baud Rate:   280  (units 100 megabaud)
Length 9u:   0    (units km)
Length 9u:   0    (units 100 meters)
Length 50u (OM2):  3    (units 10 meters)
Length 50u (OM3):  7    (units 10 meters)
Length 62.5u:0    (units 10 meters)
Length 50u (OM4):  10   (units 10 meters)
Vendor Name: BROCADE
Vendor OUI:  00:05:1e
Vendor PN:   57-1000333-01
Vendor Rev:  A
Wavelength:  850  (units nm)
Options:     083a Loss_of_Sig,Tx_Fault,Tx_Disable
BR Max:      112
BR Min:      0
Serial No:   JAF417120000GP0
RX Power:    -1.0    dBm (797.7uW)
TX Power:    -3.7    dBm (430.8 uW)