That’s one thing about the Cisco forums that irritates me. No one ever wants to proved a real cutdown educated answer. They just refer documents. It’s easy to throw whitepapers I guess than rather EXPLAIN in your own words. It shows a real lack of technical understanding of one cannot convey and break down a concept.
It’s a simple question. If the core be it a Nexus 7k pair running 7.2 to a end-host, can an NSX edge router dynamically route to the SVI over VPC. Historically it’s been unsupported and VMWare/Cisco documents mention Cisco not supporting dynamic routing over VPC yet Cisco in other docs states with XYZ version it is.
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The Intel X520 is a supported adaptor with UCSM integration, but I'm not sure why Cisco TAC stated you could dual home it with a Nexus. When it is stated as supported the Adapter must be connected to the FIs or FEXs. Your Cisco VIC support both Data and Management versus non-Cisco cards are data only. When using non-Cisco CNA cards the 1Gb LOM ports from the C240 are connected to the FIs along with the 10GbE Intel X520.
I know that is not what you've done, you had the VIC originally and TAC for some reason said you could dual home it. I don't know why they stated this because its an unsupported setup. When integrated into UCSM all connections must go to the FIs.
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