In BGP (Border Gateway Protocol), mesh peering is a configuration in which all routers in an autonomous system (AS) are connected to each other via BGP peering sessions. This type of configuration can be used to improve the stability and reliability of the BGP network, as well as to reduce the risk of routing loops.
One way that mesh peering can help to avoid routing loops is by allowing all routers in the AS to have a complete view of the routing table. When a router receives a route from a neighbor, it can compare the route to the routes in its own routing table to determine if it is the best path. If the route is not the best path, the router can ignore it and prevent it from being advertised to other neighbors. This can help to ensure that traffic is directed along the correct path and prevent routing loops.
To configure mesh peering in an internal BGP network, you will need to establish BGP peering sessions between all routers in the AS. This can be done using the “neighbor” command in the BGP configuration.
In the case of multihoming BGP, where your AS becomes a transit hub to forward traffic between external AS, each BGP edge router within AS needs to do peering each other in order to forward traffic optimally without loop. therefore it is very useful to do mesh peering within BGP router.
How BGP tuning Mesh Peering to Avoid Loop works ? we discussed on this webinar series
Webinar topic: BGP Tuning: Peer with Loopback
Presenter: Achmad Mardiansyah (CEO GLC Networks)
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