BGP (Border Gateway Protocol) is a protocol used to exchange routing information between different autonomous systems (ASes) on the internet. Unlike interior gateway protocols (IGPs) such as OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System), BGP operates on a path-vector basis rather than on the exchange of LSAs (Link State Advertisements).
BGP routers exchange routing information through a series of update messages, which contain information about the network prefixes and their associated attributes. These updates are exchanged between routers only when there is a change in the routing table, rather than periodically or in response to a query.
Because BGP does not rely on LSAs, it minimizes the number of requests that need to be sent to other routers in the network. This is especially important in large networks where the number of LSAs can quickly become overwhelming, leading to slow convergence times and increased network overhead.
In summary, BGP minimizes the need for LSAs by using a different protocol to exchange routing information, which reduces network overhead and improves overall network performance.
