F3215-HP Load Balancing Module High Availability Configuration Guide-6PW101

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If you click Modify Backup Interface before clicking Apply, the configurations you have made on
the stateful failover configuration page are lost.
An intermediary device (such as a router, a switch, or a hub) is allowed between the failover
interfaces. Make sure the packets forwarded by the intermediary device carry the backup VLAN
tag.
Do not directly connect two failover interfaces on the same stateful failover device.