can we create route map statement in such a way that it uses multiple default gateways for a particular set of host. If one gateway goes down then traffic automatically redirected to second gateway mentioned in route map on WS-C3560G-48TS-S. Is there any Hardware limitation?
as I wrote in my first post the problem is when all IP next-hops are in the same IP subnet/Vlan like in your example.
In this case without additional features like ip verify-reachability or forms of tracking the local node can realize the next-hop is down after up to 4 hours the time the ARP entry is alive in the ARP table.
To mitigate this you should have the different next-hops in different point-to-point subnets so that the switch can detect the failure of one of them.
No, PBR won't able to find that next hope is not available and it will still send packets toward interface having IP in the subnet 172.17.17.3 where packets will be dropped. You need PBR with object tracking using command 'set ip next-hop verify-availability'.
set ip next-hop verify-availability 172.17.17.3 track 123
Above command set the next-hop to 172.17.17.3 if object 123 is up. If object 123 is down, then policy routing fails and unicast routing will route the packet. You need to define tracking 123 for this which will monitored availability of next hope 172.17.17.3.
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