When an Eth-Trunk is used as
the backup channel, ensure that the same physical interfaces are bound to the
Eth-Trunk interfaces on the two firewalls. Otherwise, the sessions of the
active firewall cannot be completely backed up to the standby firewall.
If member interfaces of an Eth-Trunk interface are different and hot standby firewalls work in load balancing mode, services may be interrupted. If the member interfaces of an Eth-Trunk interface are different on hot standby firewalls in active/standby mode, some services are interrupted after an active/standby firewall switchover.