Cisco SD-WAN traffic flow

[Newbie..9109]

Hi,

Based on picture above, assuming that's cisco SD-WAN in DC. How cisco SD-WAN in DC serve the traffic from sd-wan branch? Will both device in DC be active-active? or only one will serve the traffic from branch?

If the answer is active-active, how to ensure symmetric traffic? I mean traffic from branch towards WAN edge A DC, the return traffic will also come towards WAN Edge A DC, not WAN Edge B DC.

[MHM Cisco World]

It can work as active/passive or active/active 

This depends if you use preference or not with OMP route / TLOC 

If you dont use preference then you will get load balance.

MHM

[Newbie..9109]

If active active, how sd wan DC advertise branch prefix to campus LAN? Will both sdwan router advertise the same branch prefix (potentially asymmetric)? Or both sdwan router will advertise different branch prefix (symmetric)?

[balaji.bandi]

Its all depends on how you configure - what route you like to use (here we call colors in sd-wan terminology)

check below some examples provide you that information.

https://www.cisco.com/c/en/us/td/docs/solutions/CVD/SDWAN/cisco-sdwan-design-guide.html