L3Out Port-channel

[apache_le]

Hi everyone,

Please see the attached picture for reference.  I have 2 questions about this setup:

.  When you connect a pair of Leaves to the external network and it requires 4 10G connections, in each Leaf, do you crosspatch from each Leaf to the upstream switches like in the picture or no crosspatch?

.  If crosspatch, how do you configure vPC in ACI?  I mean, in NX-OS world, you would create port-channel in each Leaf first then configure vPC under the port-channel interface.  How do you do that in ACI?  Someone told me you would configure a single vPC Interface policy group and add the 4 interface to it.  Just want to clarify.  

Thanks.

[Jason Williams]

Apache_le, 

Thanks for posting in the support forums. Please see inline. 

When you connect a pair of Leaves to the external network and it requires 4 10G connections, in each Leaf, do you crosspatch from each Leaf to the upstream switches like in the picture or no crosspatch?

If by 'crosspatch', you mean full-mesh, then yes this would be appropriate. 

aci-leaf-1 <> standalone-1

aci-leaf-2 <> standalone-1

aci-leaf-1 <> standalone-2

aci-leaf-2 <> standalone-2

If crosspatch, how do you configure vPC in ACI?  I mean, in NX-OS world, you would create port-channel in each Leaf first then configure vPC under the port-channel interface.  How do you do that in ACI?  Someone told me you would configure a single vPC Interface policy group and add the 4 interface to it.  Just want to clarify.  

You would configure 1 VPC policy group and apply this policy group to all interfaces participating in the same back-to-back/double-sided VPC. Just make sure that the VPC domain ID on the standalone devices are different from the ACI VPC domain ID. 

[apache_le]

Thank you for your comment.  Yes, crosspatch means full-mesh.  So it sounds like we are on the same pace with the ACI configuration piece.  The uplink switch(es) are a pair of VSS-enabled switches, FYI.