BGP Protocol 2024 boarder gateway protocol.pptx

BGP Protocol

1. BGP PROTOCOL BGP (Border Gateway Protocol) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet.

2. Key Features of BGP BGP is a path vector protocol, meaning it maintains a list of autonomous systems (AS paths) that a route has traversed. This helps in making routing decisions and preventing routing loops.

3. Key Features of BGP BGP is designed to handle large-scale routing environments, making it suitable for the global Internet.

4. Key Features of BGP BGP allows network administrators to implement routing policies based on various attributes, such as AS path length, local preference, and community values. This enables fine-grained control over routing decisions.

5. Key Components of BGP BGP routers establish peer relationships with other BGP routers to exchange routing information. Peers can be either internal (iBGP) or external (eBGP).

6. BGP Messages Open:  Establishes a BGP session. Update:  Advertises routes and withdraws previously advertised routes. Notification:  Indicates an error condition and may result in the termination of the BGP session. Keepalive:  Maintains the BGP session by periodically sending keepalive messages.

7. BGP Attributes AS Path:  Lists the autonomous systems that a route has traversed. Next Hop:  The IP address of the next router in the path to the destination. Local Preference:  A value used to influence the selection of the best route within an autonomous system. MED (Multi-Exit Discriminator):  A value used to influence the selection of the best route between autonomous systems. Community:  A tag used to group routes and apply policies to them.

8. BGP Operation BGP routers exchange routing information by advertising routes to their peers. These advertisements include the destination network and various BGP attributes.

9. BGP Operation BGP uses a complex decision process to select the best route based on attributes such as AS path length, local preference, MED, and community values.