Elements of BGP
Some elements of BGP are assigned to each path and these elements help routers to select a path from multiple paths.Here below are some elements of BGP:
- Weight: Weight is defined as a Cisco-specific attribute that tells a router which path is preferred. The weight having a higher value is preferred.
- Originate: This tells how a router choose routes and adds to BGP itself.
- Local Preference: Local Preference is an element used to select the outbound routing path. Greater local preference is preferred.
- Autonomous System Path: This element tells the router to select a path having a shorter length.
- Next Hop: To reach the destination the next hop elements specify the IP address that should be used as the next hop.
BGP Route Information Management Functions:
- Route Storage: Each BGP stores information about how to reach other networks.
- Route Update: In this task, Special techniques are used to determine when and how to use the information received from peers to properly update the routes.
- Route Selection: Each BGP uses the information in its route databases to select good routes to each network on the internet network.
- Route advertisement: Each BGP speaker regularly tells their peer what is known about various networks and methods to reach them.
Border Gateway Protocol (BGP)
The protocol can connect any internetwork of the autonomous system using an arbitrary topology. The only requirement is that each AS have at least one router that can run BGP and that is the router connected to at least one other AS’s BGP router. BGP’s main function is to exchange network reachability information with other BGP systems. Border Gateway Protocol constructs an autonomous systems graph based on the information exchanged between BGP routers.
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