Since NSX is a stub and won't transit any traffic most customer push a default route down to NSX that will pull all traffic up to the physical network. In this case two separate NSX instances wouldn'...
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Since NSX is a stub and won't transit any traffic most customer push a default route down to NSX that will pull all traffic up to the physical network. In this case two separate NSX instances wouldn't have routes in their routing tables for the others network, but would sent all traffic north to the physical network which does have routes to both in the routing table. Uplink router advertise a default route (0.0.0.0/0) to T0. So if VCF-A advertises a network into the physical BGP ASN it will never be populated into the routing table of VCF-B because the default route supersedes the individual routes. Since NSX is a stub ASN of the physical ASN in this use case and won't transit any traffic it isn't needed for the physical ASN to exchange full tables. We send all of our routes up, they just send a default down to us.
