Newly seated ports are down and fail negotiation

• ONTAP 9
• SFP

• Ports e4a and e4b on ifgrp a0b on both nodes are down but indicate electrical connectivity even after port bouncing from both sides, re-cabling, and verifying cable integrity.
• Traffic is not being received from an unknown switch in the customers infrastructure.

netif.linkDown:info]:Ethernet e4a: Link down, check cable

netif.linkDown:info]:Ethernet e4b: Link down, check cable

• ifconfig shows the following on ports e4a and e4b on ifgroup a0b which has blank lagg statistics=

a0b:flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu1500
        lagg statistics:
                activeports:0
                flapping:0
        lag id:[(0000,00-00-00-00-00-00,0000,0000,0000),
                (0000,00-00-00-00-00-00,0000,0000,0000)]
        laggport: e4aflags=20000<DEFAULT>state=41<ACTIVITY,DEFAULTED>
                [(8000,D2-39-EA-38-C6-15,8012,8000,0012),
                (FFFF,00-00-00-00-00-00,0000,FFFF,0000)]
                input/outputLACPDUs: 0 / 0
        laggport: e4bflags=20000<DEFAULT>state=41<ACTIVITY,DEFAULTED>
                [(8000,D2-39-EA-38-C6-15,8013,8000,0013),
                (FFFF,00-00-00-00-00-00,0000,FFFF,0000)]
                input/outputLACPDUs: 0 / 0

e4a:flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
status: no carrier (Negotiation failure)
plugged:SFP/SFP+/SFP28 100GBASE-SR4 or25GBASE-SR (LC)
vendor:FINISAR CORP. PN: FTLF8536P4BCL-N1 SN: SN24672 DATE: 2021-07-08

e4b:flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
status: no carrier (Negotiation failure)
plugged:SFP/SFP+/SFP28 100GBASE-SR4 or25GBASE-SR (LC)
vendor:FINISAR CORP. PN: FTLF8536P4BCL-N1 SN: SN24671 DATE: 2021-07-08