In this case net1 and 2 are equal cost paths and thus packets can go via either. However, RTR1 sends the SYN of a TCP flow over NET1, then all other packets for the flow over NET2. Where will the return traffic come back via? NET1 or NET2. Is there a feature on IOS which can make RTR2 send packets back to the MAC where they actually arrived from and not via the routing table?
Not 100% familar with loadbalancers, but I thought they, if necessary, keep state information and direct traffic to individual server. I.e. they weren't dependent on the network itself maintaining "sticky" paths.
Your example has equal paths between two routers. Where would the loadbalancers be deployed?
Prior to rtr1 there is a box which modifies the DSCP of certain flows. In RTR1, PBR is used to send traffic with modified DSCP via NET2. The question is about RTR2 being able to have flow aware stickyness.
One minor issue in this scenario. With TCP flows, the SYN goes via NET1 and the remainder goes via NET2. I am not sure that NAT will help here. RTR2 will need to follow the SRC mac for each traffic flow. The crazy thing is, I can do this on a linux router for free, but sadly, the IT policy is to prevent linux routers to be used in such a case.
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