SDWAN branch fails to learn BGP routes from headquarters

The connection between headquarters and branches passes through core and carrier devices, with an on-site full-mesh network. Both the headquarters and branch LANs are connected to their respective bypassed cores, using static routes to point to each other.

In SDWAN full-mesh networking, branches cannot learn BGP routes from the headquarters, while the headquarters can learn BGP routes from branches.

Check the basic configuration. Both the headquarters and branch have introduced static and directly connected routes under the BGP VPN address family, and the area topology is configured in full-mesh mode. However, the branch site has not accessed the headquarters device, resulting in only unilateral route learning.

For Full-mesh networking, it is recommended to configure the area topology with the mode set to Full-mesh. The regional RR site serves as the headquarters device, and branch sites need to connect to both the headquarters site and other branch sites.