Spines can connect to Routers when talking about GOLF feature and will also connect to routers for the Inter-pod/inter-spine network for both Multi-Pod and Multi-site. Spines can also directly connect to another Site's spines in the case of Multisite...

Well! Sometimes I do like to use the analogy where BDs are just like VLANs, except in ACI it's not the whole story... You need to put your EPs into Zones, which are EPGs. This is a requirements. So in a lot of ways BDs are VLANs and EPGs are extra st...

I think you might have some issues doing this with vzAny contracts, but you can follow this guide to enable route leaking on the subnets that you want to leak to allow inter-vrf communication: https://www.cisco.com/c/en/us/solutions/collateral/data-c...

Hello!   I am not 100% clear on what you are asking, but I believe you are asking how to achieve this scenario but instead of going in and out of the fabric via L3 Externals, how to achieve PBR with Route leaking between VRFs. Is this correct?    

Hello. I am still not 100% clear what you'd like to do. If you want ACI to participate in any routing, you will need a VRF and at least one L3 Out. If the routing information must pass through ACE between the two FWs, then you will need transit routi...