I need help with the below scenario:
As shown in the attached image there's a two sites connected throw a Cisco ISR1004 we want to make a DR for site A in site B.
My questions is:
How to connect the both sites with same network address?
How can i keep site B connected to site A and reconnect it with Site A in DR site if site A fail?
Can you elaborate what you mean on failure of site A, Do you mean if the mpls connection fails?
Adding redundancy to a network is a good thing however it can be expensive especially it involves adding an additional mpls interconnect, a cheaper solution could be to have raw internet feeds (RIF) at both sites and run something like an ipsec site-to-site vpn with OSPF over it which then can be used incase either site mpls link fails.
What i mean by site failure is that all the site for some reason goes down and i has a replication solution that replicate all my virtual machines to site B and automatically start them up.
so what i want is when my virtual machines startup at site B with preserving same IP addresses they can not connect outside as no gateway exist in site B.
that is exactly what I mean. You configure the same IP addresses on the backup devices, and only 'activate' them when the primary link goes down.