BGP announcements? [closed]

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Can anyone explain how announcing in BGP works? I understand BGP finds the shortest/lowest-cost path to a destination network, but I also read somewhere that it announces these paths. Is that true, and how exactly does it announce a route?

Answer 1

BGP is Exterior Gateway Protocol and it is used in the network Borders between Autonomous systems , announcing network work like this example : for example we have 3 Autonomous systems A,B A have those tow networks 1.1.1.0/24 and 2.2.2.0/24 B have those tow network 3.3.3.0/24 and 4.4.4.0/24 so Edge router in A directly connected to Edge router in B and running BGP , every router announce (or advertise) which internal networks it have ( or want to publish) so now A routers know that there is 3.3.3.0/24 and 4.4.4.0/24 networks and they are reachable via Edge router of B and same with B networks