BGP (Border Gateway Protocol) handles route updates in the following way:
1. BGP uses TCP (Transmission Control Protocol) to establish a reliable and persistent connection between neighboring routers for exchanging route information.
1. BGP routers send updates only for changes in routing information, rather than periodically updating all the routes.
1. When a BGP router receives an update, it checks if the announcement is a new route or an update to an existing one.
1. If it is a new route, the router adds it to its routing table and sends it to its neighboring routers.
1. If it is an update to an existing route, the router updates its own routing table and sends the update to its neighboring routers.
1. BGP routers use a decision process called the BGP “best path selection algorithm” to select the best path for a given destination.
1. The best path is then propagated to all the other routers in the network.
Overall, BGP is a complex protocol that is designed to ensure a stable and efficient exchange of routing information between routers.
