Thursday, October 8, 2020

OSPF&BGP on collapsed core - yes or no?

Hi All,

Hpe you are doing well in those difficult times.

For the beginning, I’m not an expert in routing, therefore my question.

Lets say we have 2 situations, both of them built on collapsed core design what what would be the benefits of routing on LAN side with BGP advertisements

Case A) 2 buildings, 2 core stacks, WAN/internet router in both buildings in active/passive mode with VRRP and OSPF on LAN side. Default route on core to WAN router, on access to core SW

Case B) 1 core stack of 2 switches, 2 WAN/internet routers connected to each stack member, eith direct heart beat connection. Make sense to run OSPF on LAN side and advertise BGP routes in that case? If yes, how eould the network benefit from that?



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