Redundant interfaces
On the FortiMail unit, you can combine two or more physical interfaces to provide link redundancy. This feature allows you to connect to two or more switches to ensure connectivity in the event one physical interface or the equipment on that interface fails.
In a redundant interface, traffic is only going over one interface at any time. This differs from an aggregated interface where traffic is going over all interfaces for increased bandwidth. This difference means redundant interfaces can have more robust configurations with fewer possible points of failure. This is important in a fully-meshed HA configuration.
A physical interface is available to be in a redundant interface if:
• it is a physical interface, not a VLAN interface
• it is not already part of a redundant interface
• it has no defined IP address and is not configured for DHCP
• it does not have any VLAN subinterfaces
• it is not monitored by HA
When a physical interface is included in a redundant interface, it is not listed on the System > Network > Interface page. You cannot configure the interface anymore.
For information about adding redundant interfaces, see
“Configuring the network interfaces”.