Port Channel connected to S4810 on firmware 9.2x does not come up after going down.

As per PR 130067, when a peer device connected to S4810 running 9.2.x is rebooted or its interfaces is flapped, S4810 will send out the LACP PDUs with incorrect state that causes the LACP negotiation issue.

This PR on S4810 is fixed in 9.3 or later releases.

Below is the procedure to recover the port channel from the S4810 side, if the upgrade cannot be immediately performed.

4810#sho run int ten 0/31

interface TenGigabitEthernet 0/31

 no ip address

mtu 12000

 port-channel-protocol LACP

port-channel 128 mode active

 no shutdown

4810#con

4810(conf)#in ten 0/31

4810(conf-if-te-0/31)#no port-channel-protocol lacp

4810(conf-if-te-0/31)#

4810(conf-if-te-0/31)#sho config

interface TenGigabitEthernet 0/31

 no ip address

 mtu 12000

 no shutdown

4810(conf-if-te-0/31)#ex

4810(conf)#no int port-channel 128

4810(conf)#in ten 0/31

4810(conf-if-te-0/31)# port-channel-protocol LACP

4810(conf-if-te-0/31-lacp)#  port-channel 128 mode active

4810conf-if-te-0/31-lacp)# no shutdown

4810(conf-if-te-0/31)#Oct 21 11:27:28 PST: %STKUNIT0-M:CP %IFMGR-5-ASTATE_UP: Changed interface Admin state to up: Po 128

Oct 21 11:27:31 PST: %STKUNIT0-M:CP %LACP-5-PORT-GROUPED: PortChannel-128-Grouped: Interface Te 0/31 joined port-channel 128.

Oct 21 11:27:31 PST: %STKUNIT0-M:CP %IFMGR-5-OSTATE_UP: Changed interface state to up: Po 128