Aci multisite

Hello,

I'm trying to set up multisite in the lab for the two fabrics. I don't fully understand how to configure ISN for it.

Current set up has 2 multipod fabrics with a single spine from each pod connected to an IPN.

There are two IPN switches (not 4) so pod 1 from fabric 1 and the 2 is connected to IPN 1 and pod 2 from fabric 1 and 2 is connected to IPN2.

Let say the ports for fabric one are: Pod 1 Spine 1 int 1/1 => int1/1 IPN 1 Pod 2 Spine 2 int 1/1 => int1/1 IPN 2

And fabric 2 Pod 1 Spine 1 int 1/2 => int1/2 IPN 1 Pod 2 Spine 2 int 1/2 => int1/2 IPN 2

IPNs are connected at some other interface

How do I configure ISN for this?

From what I understand about ISN I need a connection between fabric 1 and 2. Can I use the already created connection from multipod? And if so do I need to make any changes to config on the IPNs?

Or do I need another connection such as fabric 1 Spine => IPN => IPN => fabric 2 spine.