1. Two firewalls of the same model implement dual-system hot backup in master/slave mode. They are connected to a core switch for traffic diversion.
2. After a simulated shutdown, the slave firewall is started. The master firewall is not powered off at this time, but the service network cable is removed. The heartbeat link between the master firewall and the slave firewall is still up.3 Policy-based routing of the core switch fails to be recovered, and the slave firewall fails to forward packets normally.