Hi @sdwannew13 

By default, the Velocloud Gateway will advertise the default route. In our SD-WAN Topologies, one of the most common scenarios is having a Hub-Spoke. If we consider this scenario, you may want to advertise a default route from the Hub to the Spokes to have an "internet" backhaul scenario to send all internet traffic( 80/443)  through the Hub for different purposes (inspection, rules, etc). 

There will be different scenarios in where default route would not make sense to be advertised from the Hub but we need to analyze the topology of your network to provide a more accurate answer.

Let me share with you the link for the Administration Guide VMware SD-WAN

https://docs.vmware.com/en/VMware-SD-WAN/4.5/VMware-SD-WAN-Administration-Guide.pdf

Please let me know if this answers your question. 

MarcoHB

Hello Marco

thank you for your answer but my question is pretty basic what is the meaning of advertising default route on sdwan device? Does it mean that spoke's default route will point to hub? And that default route is injected by hub by advertising it to spoke?

Advertising into the overlay means a route that is locally learnt on an edge will be sent to the Velo gateway which then reflects it to all other edges in the enterprise (based on the config)

One example - Say we configure a static default route on a hub pointing to some LAN side interface. Now when this route is advertised to the overlay, all other edges that receive this route will install the route in their FIB and the next hop will point to the hub