Brocade switch is in in_sync status due to faulty switch side SFP

• Ontap 9
• Brocade switch
• SAN

• Switch port state shows as In_Sync under switchshow output:

Index Port Address  Media Speed   State       Proto
==================================================

xx  xx   052b00   id    N16               In_Sync     FC

• porterrshow output shows that link fail errors are observed:

/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

XX:    0       0       0       0       0       0       0       0       0       0      11.3k    0      11.2k    0       0       0       0       0       0

• Switch SFP seems to be working fine:

RX Power: -2.6 dBm (547.9uW)
TX Power: -0.8 dBm (832.1 uW)
 

• sysconfig -a on Ontap shows the connected switch port status as unknown:

slot 2: Fibre Channel Target Host Adapter XX
                (QLogic 8324 (8362) rev. 2, <LINK NOT CONNECTED>)
                Board Name:        QLE2672
                Serial Number:     RFE1XXX2946
                Firmware rev:      8.9.0
                Flash rev:         1.1.2
                Host Port Addr:    000000
                FC Nodename:       50:0a:09:80:x0:xx:fc:d0 (500a098xxxxxxfcd0)
                FC Portname:       50:0a:09:83:80:b1:fc:xx (500a09xxx80b1fcd0)
                Connection:        No link
                Switch Port:       Unknown
  SFP Vendor Name:   FINISAR CORP.
  SFP Vendor P/N:    FTLF8529P3BCV-EM
  SFP Vendor Rev:    B
  SFP Serial No.:    PY306G1
  SFP Connector:     LC

• Cable replacement has not helped.
• Replacing the switch SFP has not helped.