For the VPC and Routing experts out there. I am doing a DC migration to some Nexus switches. Right now we have a temporary stretched L2 for migration over two pairs of dark fiber running passive DWDM for 8 ports per pair. Once completed we intend to break the L2 VPC/PO and convert over to L3 Links.
We have 4500-X VSS on one side and Two Nexus 93180 on the other side. The original plan was to convert the VPC/PO to two L3 links using OSPF on top and let it ECMP. We weren't going to use SVIs just pure "no switchport" on physical interfaces per switch. We then would bring up HSRP on the Nexus and create two additional regular L3 links between the two Nexus switches that is entirely outside of the VPC vlans, avoiding vpc blackholing, TTL issue, and orphan ports.
Now its come to my attention that the newer releases of NX-OS and 9Ks now support a command "layer3 peer-router" that allows using VPC for L3. So insisted on creating an entirely new set of L3 links everywhere that is separate. I configure a VPC interface as no switch port or use SVIs between the 4500x and Nexus's. Now before many people say why run your L3 over an L2, we have a scenario which I feel is a genuine use case. I hope I don't have to put flame pants on.
Supported Topologiesfor Routing over VPC
I wanted input from people who have done this? And thoughts from everyone.
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