Is it possible to have the same network in multiple offices? We have a 30 node MPLS network utilizing BGP for routing. Each office has a unique network or networks that is advertised via BGP. Due to an office relocation we have a need to bring up a new network and the hope would be for it to be the same as the existing office. This would eliminate the need for device IP addresses and many other headaches during the transition. It never occured to me that this might be possible but now we are wondering. How could something this work?
You cannot have the same IP subnet in multiple sites. You have a couple of options; re-IP one of the sites or use NAT to "hide" the real IP and present it to the rest of the network as a different address space.
Hope it helps.
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If you want to use the same subnet across both locations, it's possible if you can L2 bridge the two locations.
If you want to use different subnets, but under the same BGP aggregate, you can as long as you have L3 between the locations (other than BGP). (Note: the latter would be similar to multiple peering for the same site.
Unless this is transitory, or you have a very solid way to tie the two locations together, I would recommend against.