Next we have to think about the layer 2 protocols in play. You’ll want to ensure you chose a place you have enough ports to do a dual sided vPC with enough bandwidth to cover lateral traffic between new/old until the migrations are complete. The first thing to do is decide on the physical point of interconnection. Send-community extended Connecting the current fabricpath DC and new fabric See an example configuration below of how the VIP/PIP mentioned earlier operateĪdvertise virtual-rmac # for advertising the VIPĪdvertise-pip # for advertising PIP if single attached There are other methods for dual attached devices such as EVPN-multihoming but as this is cisco specific for fabricpath migrations they will not be discussed. We will be utilizing vPC on the access layer for the remainder of the post. EVPN scales significantly better than other VxLAN control plane protocols so we will not explore flood and learn or static assignment. We will run iBGP with loopback peerings to exchange EVPN routes. Single attached or routed links will advertise the physical IP address of the leaf so traffic returns the that specific leaf and not the pair. The secondary loopback is to enable the advertisement of a virtual IP address for traffic destined to the vPC pair.
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