Azure route server can be used to distribute routes from a NVA into virtual networks using [BGP]. Uses ASN 65515. Seems to be using IP addresses .12 and .13 [verify].
Route server is control plane only, does not forward traffic.
RouteServerSubnet| Resource | Limit |
|---|---|
| Number of BGP peers supported | 8 |
| Number of routes each BGP peer can advertise to Azure Route Server 1 | 1000 |
| Number of routes that Azure Route Server can advertise to ExpressRoute or VPN gateway | 200 |
| Number of VMs in the virtual network (including peered virtual networks) that Azure Route Server can support 2 | 2000 |