Border Gateway Protocol (BGP) is one of the most important topic in networking courses. In this blog we will discuss all about BGP in details that will help you to understand the concepts of Border Gateway Protocol.
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A routing protocol called Border Gateway Protocol (BGP) is utilised by routers in various autonomous systems (AS) on the Internet to exchange routing data. A group of interconnected networks that are managed by a single administrative domain, such as a business or organisation, is known as an autonomous system (AS).
The effective routing of traffic over the Internet is made possible through BGP, which is used to exchange routing information between routers in various ASes. BGP is a path vector protocol, which means it chooses the best route to a destination based on the qualities and path information of a route. BGP routers communicate about the routes they are aware of and utilise this data to build a routing table that displays the most direct route to each destination.
The only routing protocol utilised to establish routing between various ASes on the Internet is BGP, which is a standard Internet routing protocol. To exchange routing data between various sites or regions, it is also used in enterprise networks, service provider networks, and data centre networks.
In conclusion, BGP is a routing protocol used on the Internet to transmit routing data between routers in various autonomous systems (AS). In addition to being utilised in enterprise, service provider, and data centre networks, it is used to establish routing between various ASes on the Internet.
There are two main types of Border Gateway Protocol (BGP) that are used in networks:
It’s important to remember that although if the two types of BGP are utilised in various ways, they share a common protocol and perform similarly. The way EBGP and IBGP handle the AS PATH parameter is the major distinction between the two protocols. When a route is learned in EBGP, the AS PATH attribute is updated to include the router’s AS number. To avoid loops, the AS number is not assigned to the AS PATH element in IBGP.
In summary, there are two main types of BGP: External BGP (EBGP) and Internal BGP (IBGP). EBGP is used to exchange routing information between different autonomous systems (ASes) on the Internet, while IBGP is used to exchange routing information within the same autonomous system (AS).
Border Gateway Protocol (BGP) is a routing protocol used to exchange routing information between routers in different autonomous systems (ASes) on the Internet. BGP routers establish a session, called a BGP neighbor or peer relationship, with each other to exchange routing information.
When two BGP routers establish a neighbor relationship, they exchange their full routing tables with each other. Each router then uses the information it receives to construct a routing table that shows the best path to each destination. BGP routers use a combination of metrics, such as the shortest AS_PATH, the lowest origin code, and the lowest MED (multi-exit discriminator) to determine the best path to a destination.
BGP routers also exchange information about the reachability of a destination. This is done through the use of routing updates, which are sent to inform other routers about changes to the routing table. These updates can include information about new routes that have become available, or routes that have become unavailable.
The optimum route to a destination is chosen by BGP routers via a technique known as route selection. Route attributes like the AS PATH, the origin code, and the MED are used to determine which route to choose. The optimum path is determined by the router to be the one with the lowest metric.
In summary, BGP routers establish a session, called a BGP neighbor or peer relationship, with each other to exchange routing information. When two BGP routers establish a neighbor relationship, they exchange their full routing tables with each other. Each router then uses the information it receives to construct a routing table that shows the best path to each destination. BGP routers use a process called route selection to determine the best path to a destination, based on the attributes of a route, such as the AS_PATH, the origin code, and the MED.
Border Gateway Protocol (BGP) is used in several types of networks, including:
In summary, BGP is widely used in different types of networks such as Internet Service Providers (ISPs), Enterprise networks, Data center networks, Service Provider networks, and mainly used in inter-domain routing on the internet.
There are several ways to learn Border Gateway Protocol (BGP), including:
It’s important to remember that using a variety of techniques you can learn BGP more effectively. For instance, you may read a book, do practices in lab, can take an online course to enhance your knowledge. You may join live training where you can Implement your learnings and knowledge in labs.