Shulou(Shulou.com)06/01 Report--

BGP (Border Gateway Protocol) Border Gateway Protocol is an external routing protocol. The boundary refers to the boundary of the autonomous system, which is used to propagate routing information between autonomous systems. BGP constructs the topology diagram of the autonomous system by adding AS paths and other additional attribute information to the routing information, thus eliminating the routing loop to implement the user configuration policy.

Its focus is to select the best route and control the propagation of the route, rather than discovering and calculating the route.

BGP protocol uses link-oriented TCP as its transport layer protocol, which improves the reliability of the protocol.

BGP is a path vector routing protocol, which is used to transmit routing information between autonomous systems. BGP propagates the whole routing table when it is started, and then only propagates the part of the network changes. Classless inter-domain routing is supported.

BGP has four message types

1. Open: used to identify yourself

2. Keepalive:

3. Update: update routing information

4. Notification: notify when errors are detected

Two kinds of neighbors: EBGP, IBGP

Routing notification principle: BGP will notify all neighbors (EBGP, IBGP) of EBGP messages received.

IBGP messages received are no longer advertised to IBGP neighbors.

Generally, only the optimal route they know is reported to the neighbors, and the optimal route they know is added to the routing table.

Message format:

Newspaper head + newspaper style

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