VPC Design recommendation

[FAAA]

Hi everyone, 

We have two new nexus 93180 core switches and four nexus 93180 access layer switches with each of these having a link back to each core switch. 

We would like to connect our servers using VPC. My question is, whats the best way to confgure vpc for this setup? 
Should i create:
domain 1 between core switch 1 and 2
domain 2 between access switch 1 and 2
domain 3 between access switch 3 and 4 

Or is there a better way to configure this? 

Each server will either be connected to the cores or switches 1 and 2 or switches 3 and 4.

Thanks for your help. 

[Mark Elsen]

  - @FAAA          FYI : https://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf

  M.

[M02@rt37]

Hello @FAAA 

The optimal design for your setup is to configure one vpc domain per directly connected switch pair: Domain 1 between Core 1 and Core 2, Domain 2 between Access 1 and Access 2, and Domain 3 between Access 3 and Access 4.

Each pair should have its own dedicated peer-link and keepalive, and servers should be dual-homed only to the vPC pair they connect to (either the cores, Access 1/2, or Access 3/4). 

You avoid chaining multiple vpc domains, and it will be easier to troubleshot.

[paul driver]

Hello
I would say it all depends on your site topology - the physical locations of these switches/servers-hosts plus the fibre cabling and the availability of it all would be a factor as to how you build them into your network
naturally with the features of these switches you would want any core/distribution to become a vdc 
The other 4 switches could become independent switches as you say each linking back into the core/dis vdc via aggregation vpc links  for resilience is an applicable design .

[FAAA]

Thanks for your help guys. The switches will be in the same DC side by side in four different racks. 

[MHM Cisco World]

Pair1 core SW1 and SW2

Pair2 Agg SW3 and SW4

Pair3 Agg SW5 and SW6

You can use double sided vPC between 

Pair1 and pair2 

Pair1 and pair3

That design is great if Server connect to pair2 or pair3 via PO

MHM