You are adding EVPN VXLAN to an L3 spine and leaf topology that uses OSPF for the underlay. You plan to use a single BGP AS. Which design for EVPN neighbors is correct?
Option A all the way! Keeping it simple with just the leaf switches is the way to go. Plus, who needs route reflectors when you've got VXLAN loopback IPs, am I right? *wink wink*
D) Leaf switches should establish iBGP sessions with spine switches on their actual P2P link IP addresses. Route reflectors are not required - Really? Establishing sessions with the spine switches directly? That seems a bit counterintuitive to me.
B) The border leaf switches should act as route reflectors and specify the leaf switches' VXLAN loopback IPs as route reflector clients - Border leaf switches as route reflectors? That's an interesting approach. I wonder if it would add any extra overhead though.
C) At least one spine switch should act as route reflector and specify the leaf switches' unique loopback IPs as route reflector clients - Hmm, using the spine as a route reflector could work, but do I really want to add that extra complexity?
I think option D is the best choice. Leaf switches should establish iBGP sessions with spine switches on their actual P2P link IP addresses. Route reflectors are not required.
I see your point, Charisse. But I think option C makes more sense. At least one spine switch should act as route reflector and specify the leaf switches' unique loopback IPs as route reflector clients.
I disagree, I believe option B is the right choice. The border leaf switches should act as route reflectors and specify the leaf switches' VXLAN loopback IPs as route reflector clients.
A) Leaf switches should establish iBGP sessions with other leaf switches using their VXLAN loopback IPs. Route reflectors are not required - This makes the most sense to me. Seems like a straightforward way to set up the EVPN neighbors.
Lenna
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