I solved this problem using a catalyst 8000v router between the TGW and the vMX. Its function is: 1. Establish BGP with vMX (multi az); 2. Establish BGP with TGW over the GRE tunnel with tgw attach connect; 3. Receive the routes coming from the vMX and teach these summarized routes to the tgw. This solves the problem of the capacity of 1000 prefixes. 4. Control routing with as-prepend ... View more