Chapter 4: Redundancy
NetEnforcer AC-2500 Hardware Guide
4-13
Active Redundancy
In an Active Redundancy configuration, each NetEnforcer manages a single link while
duplicating the link’s traffic to the other NetEnforcer. Both NetEnforcers are active.
Each unit shapes the traffic of one link only, but the shaping algorithm considers traffic
of both links. Such configuration is recommended for network topologies where both
links are active in load-balancing mode.
Failover
In the event that one of the links fails due to router, switch or line malfunction, the
network redundancy mechanism (for example, spanning tree) will ensure that traffic is
routed or switched via the other link and managed by the second NetEnforcer. Since
both NetEnforcers maintain a constant view of the two links, there will be no loss of
flow's state and other information required for correct shaping and application
classification. Note that the bypass function is not used in such configurations.
Policy Configuration
In the Active Redundancy configuration, the two NetEnforcers should share the same
policy configuration.
