Policy-Based Routing (PBR) is supported for reverse SLB traffic on the ServerIron ADX. Policy-Based Routing routes traffic based on policies you define. A PBR policy specifies the next hop for traffic that matches the policy.
To configure PBR, you define the policies using IP ACLs and route maps, then enable PBR globally or on individual interfaces. The device routes traffic that matches the ACLs according to the instructions in the route maps.
In a network where clients belonging to different sub-nets and VLANs are sending traffic to VIPs belonging to their respective sub-nets, you can configure PBR to send return traffic back to each client the way it came, rather than having all of the traffic use the default route. To do this, you can configure ACLs and route maps and apply them either globally or to individual interfaces.
In the following example, clients belonging to two different sub-nets 33.33.33.0/24 and 10.10.1.0/24 are accessing VIPs 33.33.33.111 and 10.10.1.111, respectively. The next-hop routers for these clients are 33.33.33.1 and 10.10.1.1. To load balance the return traffic to the clients, you can configure the following ACLs and route map:
