BGP

BGP (Border Gateway Protocol) —  a border gateway protocol that provides dynamic routing. It is used to exchange data within autonomous systems. Autonomous systems are defined as a set of routers operating under the control of an administrator (or group). The protocol has built-in protection against looping. It is often used by global providers to exchange data.

How it works

Dynamic routing devices exchange data. The data indicates the availability of a particular routing scenario. This is necessary in order to make routes in the most optimal way. BGP works with IP addresses. With BGP it is not possible to design the exchange of information based on additional criteria. A separate policy (PBR) is used to implement the criteria (features).

Routing

The protocol establishes communication between external systems operating in autonomous mode. It is better to use already applicable ways of BGP configuration, not to resort to creating your own policies based on this protocol, because already created rules have passed the test of time.

Information transmission

Routing instructions are transmitted using transport datagrams that specify the autonomous systems through which the packets passed. This mechanism is necessary to eliminate the occurrence of routing loops and to keep track of the position of the router and systems. Routers using internal dynamic routing protocols must have a good ability to carry traffic in the link.

Intent

BGP only provides packet distribution between addresses. The delivery of information is done through the TCP protocol, which guarantees the delivery of data.