Border Gateway Protocol (BGP) is a routing protocol used for exchanging routing information between autonomous systems (AS) on the Internet. It is used to route traffic between different autonomous networks, allowing the Internet to become an interconnected global network.
BGP is used by Internet Service Providers (ISPs) to exchange routing information between themselves and their customers. It allows ISPs to advertise their network routes to other ISPs and helps ensure that traffic is routed through the most efficient path possible.
One of the key features of BGP is that it allows ISPs to determine the best path for sending traffic between different autonomous systems. This is done by exchanging routing information, including metrics, routing policies, and other information. BGP also supports route filtering, allowing ISPs to exclude routes that they do not want to advertise to other service providers or the Internet at large.
Compared to other protocols, BGP is more complex than internal routing protocols such as OSPF and IS-IS, which are used to route traffic within a single autonomous system. This is because BGP has to deal with many different autonomous systems and complex routing policies, which can make its configuration and maintenance more challenging.
However, BGP is more scalable and flexible than these built-in protocols, allowing Internet Service Providers to more efficiently and securely route traffic between different autonomous systems. Furthermore, BGP is designed to be resilient to network failures, which is especially important for ensuring the reliability of the internet.
In summary, BGP is a routing protocol used for exchanging routing information between autonomous systems on the internet. It is used by Internet service providers to route traffic between different autonomous networks, allowing the Internet to become an interconnected global network. While it can be more complex to configure and maintain than other routing protocols, it offers significant benefits in terms of scalability, flexibility, and resiliency.
By Gustavo Lautenschlaeger
Telecommunications Engineer
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