fcvi.qlgc.qpErr:error received on storage end on ONTAP end

• Ontap 9
• Fabric Attached MetroCluster
• Brocade Switch

• Below error message is seen on NetApp end in EMS logs.

Sun Aug 18 18:12:16 -0700 [node3: xxx_main1: fcvi.qlgc.qpErr:error]: FC-VI adapter: FCVI driver on port 0e received QP Error. QP name = Control, QP index = 0xf, VI state = Error(state code = 0x3), sub-error = Timeout occured on the QP exchange(error code = 0xe). Remote node's system id = 538145405. This error has occured 132 times. 

• disc c3 and c3 timeout rx for port are seen in porterrshow in Brocade switch logs.

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
  0:    4.0g   1.4g   0      0      0      0      0      0      0    349.1k   0      0      0      0      0      0    846      0      0   

• SFP Rx & TX values are in optimal range in sfpshow output.

Port  0:
=============
Current:     7.530   mAmps 
Voltage:     3344.0  mVolts 
RX Power:    -2.5    dBm (567.5uW) 
TX Power:    -2.9    dBm (511.6 uW) 

• Frame unrouted detected errors are see in errdump logs.

2024/08/21-20:37:16, [AN-1014], 922785, FID 128, INFO, switcha, Frame unroute detected, tx port 0 rx port 0, sid 7xxxx0, did 70xx0, timestamp 2024-08-21 20:37:16 .
2024/08/21-20:37:40, [AN-1014], 922821, FID 128, INFO, switcha, Frame unroute detected, tx port 0 rx port 0, sid 7xxxx0, did 70xx0, timestamp 2024-08-21 20:37:40 .