Can a SDWAN device be used as transit path to other SDWAN device?

[David Nunes]

Hi all,

I have an design which 2 cEdges (Site B) must received a default route from other cEdges (Site A). So cEdges in site B must cross the cEdges in site A to associate to SDWAN controllers in Cloud (Cisco Based).  I would like to know if this design is possible?

[Kanan Huseynli]

HI,

First you need to advertise default route in underlay - VPN0. Most probably you have private WAN between A and B.

Secondly, you need to configure loopback on SiteA, otherwhise interface will be harden for SDWAN only and will not route transit traffic.

See Figure 69 and respective explanation which is above Figure 69.

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

Figure 69.                     Loopback interface tunnel use case: MPLS Edge routers need access to control components on Internet