This article was created to explain how to create a summary route on an SD-WAN device and advertise it to the rest of the SD-WAN network.

1) First, you need to create a static summary route, which will be advertised. Add a static default route in Lan-VR (at Hub site):

It can be a default route (0.0.0.0/0) or it may also be a more specific summary of the chunk of your network.

NOTE: Make sure you select "No Install" checkbox, It installs the route in the control plane only, and do not install the route in the data plane. For example, if there is a static route to 172.16.0.0/16 for which the No Install option is selected and a default route (0.0.0.0/0), a packet destined to 172.16.0.10 is sent using the default route if the data plane has no matching routes that are longer.

For example, if there is a static route to 172.16.0.0/16 for which the No Install option is selected and a default route (0.0.0.0/0), a packet destined to 172.16.0.10 is sent using the default route if the data plane has no matching routes that are longer.

2) Redistribute protocol static (if not done already) under Redistribution Policy in the same LAN-VR you created static route in. 

For selective redistribution, you can match a route (default or more specific) or a static-tag (you need to set this tag in static default route too). Go to the Redistribution Policies in the LAN-VR -> Default-Policy-To-BGP:

In place of a static default route, you can advertise a summary route of lan subnets.

More details about static route you can refer to document below: https://docs.versa-networks.com/Secure_SD-WAN/VOS_Network_and_System_Configuration/Configure_Virtual_Routers

Please be aware this is a general guidance about redisctributing a static route. You need to evaluate your infra and if there are any impacts of adding this static route before actually implementing in production.