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Border Gateway Protocol Presented BY
Jay Purohit & Rupal Jaiswal 304455065 304442169 GROUP 9
Overview• What is BGP?• Autonomous system• BGP Peering• BGP session• BGP session states summary• BGP Message Type• BGP path attributes• BGP problems• Project demo
What is BGP?
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet.
The protocol is often classified as a path vector protocol
BGP version is 4 and TCP port number that it uses is 179
BGP was created to replace the Exterior Gateway Protocol to allow fully decentralize routing.
Autonomous System
Collection of networks with same policy
Usually under single administrative control
AS 100A
BGP Peering Peering requires the exchange and updating of router
information between the peered ISPs, typically using the Border Gateway Protocol
Bilateral peering and Multilateral peering
BGP session
BGP Session States Summary
BGP Packet-Header Field
BGP Message Types There are four types of the BGP message each with its own
role in setting up, maintaining, or tearing down a BGP peering session
They are listed below: 1 OPEN messages 2 UPDATE messages 3 NOTIFICATION messages 4 KEEPALIVE messages
OPEN message
UPDATE message
NOTIFICATION message
KEEPALIVE message• BGP systems exchange keepalive messages to determine
whether a link or host has failed or is no longer available.
• Keepalive messages are exchanged often enough so that the hold timer does not expire.
• These messages consist only of the BGP header.
BGP Path Attribute BGP uses path attributes to determine the best path to the
destination. With BGP path attributes network administrator can manage the traffic flow and determine where the traffic will flow
The four categories of attributes are describe below: 1. Well-Known mandatory(AS_PATH,Origin, Next_Hope) 2. well-known Discretionary(Local-pref) 3. Optional Transitive(Aggregator, Community) 4. Optional Nontransitive(Originator_ID, Cluster list )
BGP Problems with lots of benefits and importance of BGP in network, it
also have same problem on it’s maintenance.
The main problem are listed below:
1. Internal BGP scalability 2. Instability 3. Routing table growth 4. Load-balancing problem 5. Security
Project Demo
THANK YOU
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