BGP signaling for next-hop-based dynamic tunnels

The next-hop-based dynamic GRE and UDP tunnels are signaled using BGP encapsulation extended community. BGP export policy is used to specify the tunnel types, advertise the sender side tunnel information, and parse and convey the receiver side tunnel information. A tunnel is created according to the received type tunnel community. Multiple tunnel encapsulations are supported by BGP. On receiving multiple capability, the next-hop-based dynamic tunnel is created based on the configured BGP policy and tunnel preference. The tunnel preference should be consistent across both the tunnel ends for the tunnel to be set up, and by default, MPLS-over-UDP (MPLSoUDP) tunnel is preferred over GRE tunnels.