FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
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Article Id 196229
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Some FortiGate models can use "Redundant Interface" to create a cluster configuration called full mesh HA. Full mesh HA is a method of removing single points of failure on a network that includes an HA cluster. Full mesh HA includes redundant connections between all network components. If any single component or any single connection fails, traffic switches to the redundant component or connection.

Note that Redundant Interface is not the same as aggregated interface (802.3ad). When using 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.

FortiOS firmware v3.00MR6 and above, on FortiGate models 300A, 310B, 400A, 500A, 620B, and models 800 and higher, implement the redundant interface feature.

See also the following documents at http://docs.forticare.com/fgt.html for more information about HA  and redundant interface:
  • HA Overview
  • HA Guide 
  • Fortigate Administration Guide