Routing for 2 subnets

[sokinp]

Hello all,

I don't know much of cisco routers, so I'm need of your help.
We have 2 subnets e.g 15.220.50.0 and 15.220.70.0 with two application servers DC1 15.220.50.1 and DC2 15.220.70.1.
All PC's at both subnets are using DC1. DC2 is the failover server.
How can we design it so when DC1 fails all requests to it will go automatically to DC2 which will have the IP of DC1 ?
So DC2 will be at subnet 70 with an IP of 50 subnet.
No Cisco switches available.

Thanks for your time people !

 

[sokinp]

Ok !

Well thanks to one of my friends (Fanis) we have some solutions:

1) Bridge the networks
2) 2nd Eth interface on the router & changing the ip's one the DC's with private ones and changing the conf at the clients
3) Buy Cisco switches (We have to anyway)Switch sub int and NAT
4) Play with name resolution - Not totally possible

That's all. I hope this can help someone who's in my place as well.

 

[mmcgurty]

You could do virtual interfaces on a router using ISL or 802.1Q encapsulation types, then VLAN for each network based on port on your manageable switches. You could also do secondary addressing on your Cisco router interface. For example:

interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip address 192.168.2.1 255.255.255.0 secondary
ip route-cache same-interface
(speeds up routing with secondary addressing)

The second approach seems like it would make more sense. But neither option to my knowledge addresses the failover to other server. I'm guessing you need some type of clustering fail-over software on the servers.