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Normally, you cannot have the same network address space in your routing topology more than once.
If you have a bunch of hosts bound to a certain network address space, you might NAT one of your instances, so it appears as a different network address space to the rest of your network.
Or, if the two same network address blocks don't need to intercommunicate, you might be able to have multiple "virtual" networks (using some form of VRF) and have one such network address block in each.
