I have setup in which all the machine gateway is one router R1 and that router has 2 other routers R2 & R3 to forward the request (Primary and secondary in case on router goes down). R1, R2 and R3 are in the same vlan in the same subnet. if R1's primary route is via R2, then the machines have the gateway for subnet via R2. if the R1 decides to go via R3, but the machines still got the R2 information in its routing table for 5 minutes. how can i setup that machines always go to R1 and will not get next hope R2 / R3 information from R1.