So I've been tasked with extending a single /24 subnet across 3 data centers due to VM.  We need the 3 because a witness server is required.Data Center 1 - 2 Nexus 7710 w/vPC v8.1(1)Data Center 2 - 1 Nexus 7706 v8.1(1)Data Center 3 - Catalyst 9400 v1...