What happen when not using BGP EVPN between Leafs and Spines

[Chaker BCHIR]

Hi all,

So the question is simple as the title indicates :)

I use OSPF between 4 Leafs and 2 Spines.

Multicast trafic is well implemented (the spines will be acting as Anycast RP ..).

Config of VxLAN (VNI, Int NVE, ...) done.

Is it obligatory to use BGP EVPN to implement VxLAN ? What is the purpose of implementing it cause I see that OSPF carry well Multicast traffic between Leafs and Spines ?

Thanks in advance. 

[nazimkha · Accepted solution]

The multicast-based VXLAN is flood-and-learn mechanism with no control plane. Scalability is always an issue with flood & learn. Also running multicast in underlay may not work for everyone plus it cannot be used as a DCI solution.

Detailed explaination by Yves Louis
http://yves-louis.com/DCI/?p=648

[Chaker BCHIR]

Thanks a lot Nazimkha !