How can I implement a backup 6500 that broadcasts the same OSPF networks?

I feel as though the answer for this is extremely simple, but my routing experience is very minimal. We have a 6500 switch that shares about 10 OSPF networks, which is behind out 7200 router; and we have a spare 6500 we would like to put into place at our second location as a failover. Can I add the same OSPF networks to this second 6500, or will this cause issues since two switches will be broadcasting the same network.
In the case that our core 6500 goes down, i would need the other 6500 to continue broadcasting these networks.

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Yes, it's possible for two locations to advertize the same networks, but this implies that both locations can (normally) reach all the hosts on those networks (at either location). Also, if there's some kind of failure, some hosts (like one location's hosts) often can no longer be reached. That's normally ok, but what's normally not okay is for hosts on the same network to be partitioned.
Also, when you start to have networks across locations, sometimes there's requirements for hosts to logically migrate to the site that still is advertizing the host's network.
It can all get rather complicated depending on what exactly you're trying to accomplish.

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How can I implement a backup 6500 that broadcasts the same OSPF networks?

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