BGP (Border Gateway Protocol) handles transit routes by allowing autonomous systems (ASes) to exchange routing information and make decisions on how to route traffic between different networks. If an AS receives a transit route, it means that the traffic needs to be forwarded through that AS to reach its destination.
When a BGP speaker receives a transit route from a neighbor AS, it will add it to its BGP routing table as a learned route and propagate it to its other BGP neighbors. The AS may also apply various policies to the transit route, such as setting a preferred path or filtering out unwanted routes.
BGP also allows ASes to announce their own transit routes to their neighbors. This enables them to offer transit services to other networks and earn revenue for carrying traffic through their network.
Overall, BGP enables efficient routing of traffic between different networks by allowing ASes to advertise and learn transit routes.
