Monday, July 19, 2021

Arista ECMP in iBGP Question

Hello All,

Have been trying to find it but dont seem to be coming up with a solution.

Basically i have 1 Arista L3 switch that is connecting to 4 Cisco Edge routers. All Cisco devices are advertising default routes to the Arista. I am diverting traffic via Flowspec Next Hop to Arista and then to a Security Appliance. The traffic returns back to Arista and to one of the closest Cisco routers and follows GRT tor each destination. The only issue i am having is all 4 have ECMP on Arista and regardless which router sent the traffic to arista, by default bgp action, it will choose the best path to be lower IP since AS, LocPref weight etc. are all the same. ECMP is happening

My question is how can i send traffic through the same interface(cisco router) that it came from?

Do i just remove the maximum-paths command and should work?



No comments:

Post a Comment