Network port down after Nexus switch reboot

Applies to

• FAS8700
• Cisco Nexus 9300-FX2 (N9K-C93216TC-FX2)
• Network Interface Card (NIC) X1149A

Issue

• After rebooting the Nexus switch, port 1/73 on the Nexus connected to NetApp's e1a is down.
• ASUP shows SYSCONFIG-A and NETWORK-PORTS.XML indicating the corresponding port e1a on the FAS8700 is up.

    slot 1: 1/10 Gigabit Ethernet Controller IX4-T
        e1a MAC Address:    b4:XX:XX:XX:XX:4c (auto-10g_t-fd-up)
        e1b MAC Address:    b4:XX:XX:XX:XX:4d (auto-10g_t-fd-up)
        Device Type:        X550, PBA H86377-006
        Firmware Version:   1.86-0.3
        Serial Number:      B49XXXXXXX4C

• Troubleshooting steps taken:
  1. Replaced the cable between Nexus eth1/73 and FAS8700 e1a, but the Nexus port 1/73 remains down.
  2. Moved the configuration to an unused port 1/93 on the Nexus and connected, but the Nexus port remains down.
• The ifgroup a0a is configured with multimode_lacp using e1a and e1b, but e1a is in Down Ports status with "Port Participation" as "partial".
• "IFSTAT -A" shows a lot of CRC errors and  total errors.

-- interface  e1a  (560 days, 1 hour, 23 minutes, 45 seconds) --

RECEIVE
 Total frames:      685g | Frames/second:   14168  | Total bytes:      2844t
 Bytes/second:    58789k | Total errors:      166  | Errors/minute:       0 
 Total discards:      0  | Discards/minute:     0  | Multi/broadcast:  5895k
 Non-primary u/c:     0  | CRC errors:         79  | Runt frames:         0 
 Fragment:            0  | Long frames:         0  | Jabber:             85 
 Length errors:       2  | No buffer:           0  | Xon:                 0 
 Xoff:                0  | Pause:               0  | Jumbo:             371g
 Noproto:             0  | Error symbol:     1981  | Illegal symbol:     80 
 Bus overruns:        0  | Queue drops:         0  | LRO segments:      289g
 LRO bytes:        2812t | LRO6 segments:       0  | LRO6 bytes:          0 
 Bad UDP cksum:       0  | Bad UDP6 cksum:      0  | Bad TCP cksum:       0 
 Bad TCP6 cksum:      0  | Mcast v6 solicit:    0  | Lagg errors:         0 
 Lacp errors:         0  | Lacp PDU errors:     0 
TRANSMIT
 Total frames:      418g | Frames/second:    8651  | Total bytes:      2268t
 Bytes/second:    46881k | Total errors:        0  | Errors/minute:       0 
 Total discards:      0  | Queue overflow:      0  | Multi/broadcast:  3230k
 Collisions:          0  | Xon:                 0  | Xoff:                0 
 Pause:               0  | Jumbo:             123g | Cfg Up to Downs:     0 
 TSO non-TCP drop:    0  | Split hdr drop:      0  | Timeout:             0 
 TSO segments:    59487m | TSO bytes:        1913t | TSO6 segments:       0 
 TSO6 bytes:          0  | HW UDP cksums:       0  | HW UDP6 cksums:      0 
 HW TCP cksums:       0  | HW TCP6 cksums:      0  | Mcast v6 solicit:    0 
 Lagg drops:          0  | Lagg no buffer:      0  | Lagg no entries:     0 
DEVICE
 Mcast addresses:     3  | Rx MBuf Sz:       4096 
LINK INFO
 Speed:           10000M | Duplex:            full | Flowcontrol:       none
 Media state:     active | Up to downs:          2 | HW assist:        7711