Hello, So then you could do this:
D1 to S1
D1 to S2
D2 to S1
D2 to S2
(not including the VPC peer or keepalives)
From N7K1 and 2 Core VDC's
Have 1 VPC to N7K1-Access VDC
Have 1 VPC to N7K2-Access VDC
This means that your core will have VPC's but your access will have port-channels to your core and not vpc's.
And then have your N7K2's / FEX attached to this access layer.
D1 and 2 to S1 - VPC 1 on CORE
D1 and 2 to S2 - VPC 2 on CORE
The other way, which I haven't quite tried before, but no reason why it shouldn't work...
You have D1 and D2 provide one VPC (a) to S1 and S2
You have D1 and D2 provide one VPC (b) to S1 and S2
In this scenario you would have x2 VPC's on the core, and x2 VPC's on the access.
D1 to S2 - VPC1 - both sides
D2 to S1 - VPC1 - both sides
D1 to S1 - VPC2 - both sides
D2 to S2 - VPC2 - both sides
Just be sure to enable peer-switch, peer-gateway, ip arp synchronize for the VPC domain for efficiency
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