Redundancy is one of the key elements in building robust networks.
The Security Appliance offers a failover function that provides a safeguard mechanism in the event of a unit failure. When one fails, another immediately takes its place. The Security Appliance supports the following two types of failover setup. Both failover
modes support stateful or stateless failover.
Active/Standby Failover Mode (Redundancy): In this mode, only one unit (the primary, also called the Active unit)
passes traffic, whereas the other unit is in a standby state. The Active/Standby failover is available in both single and multiple
context modes.
Active/Active Failover Mode (Load Balancing): In this mode, both devices can pass network traffic by sharing bandwidth
resources on both devices. The Active/Active mode provides high-resilience, high-availability networks with load-balancing
capability. The Active/Active failover mode is available on multiple contexts mode only.
Failover Requirements
Both Security Appliances in a failover pair must be identical to each other and connected through a dedicated failover link
(interface) and optionally, a state link interface. To enable the failover feature on the Security Appliance, the criteria that follows
must be met.
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