F5 After the active/standby switchover, the host interface is down

Thank you very much for your help😀, because this problem occurred at the customer's site, so there is no relevant information at present. The configuration of self-ipd is no problem. Because according to the fault scenario, two 2600s, A is the active device, B is the standby device, after the upgrade, (the standby device is upgraded first), the active/standby switchover (B becomes the active device), and then the upgrade (A becomes the standby device), an active/standby switchover will occur, and services are normal. The customer expects the active/standby status of the two F5s to be the same as before the upgrade. Therefore, I manually switched again, and then (B became the standby device again) After A became the primary device, the interface (that is, 6 in the figure you sent to me) went down, and the service went down. The subsequent recovery state is what I said, disable, then enable, then restore.

I'm sorry if what I said was a little convoluted.