#BGP ROUTE REFLECTOR FULL#

Full Mesh Topology - Full mesh topology requires every router to establish peering with every other router.The three options for doing that are as follows: iBGP uses the split-horizon rule, which means that if a BGP router receives a route from iBGP peering, it does not advertise that route to other iBGP peers.īecause of how iBGP route advertisement works, administrators need to work around it to ensure full connectivity. iBGP, on the other hand, is used entirely within the AS and requires a different approach. The router will discard the route if it sees its own AS number on the list. To understand BGP Route Reflector, it’s important to understand how iBGP advertises network paths to neighbors.ĮBGP uses the AS_PATH attribute to avoid routing loops. iBGP connects routers within an AS, while External BGP (eBGP) connects routers in different Autonomous Systems.

Internet Service Providers (ISPs) and large enterprises use BGP to interconnect Autonomous Systems (AS) and route traffic within an AS.īGP comes in two flavors: internal BGP (iBGP) and external BGP (eBGP). Understanding BGPīorder Gateway Protocol (BGP) is the engine that keeps the whole internet running. To help you get started with BGP Route Reflectors, let’s take a closer look at how they work and provide a walkthrough of a BGP Route Reflector configuration so you can get hands-on with it. Additionally, Route Reflectors simplify network configuration from an iBGP neighborship perspective and improve scalability. BGP Route Reflectors solve this problem and enable full-mesh topology within an AS and route propagation across an AS. However, iBGP routers do not advertise routes learned from iBGP neighbors. Full mesh network topologies are a vital aspect of resilient networks.

Bgp route reflector