routeprotocol.com

Revision Topics

  • BGP Path Attributes: Accumulated Interior Gateway Protocol

    AIGP, Accumulated Interior Gateway Protocol, is an optional nontransitive path attribute that is included with advertisements throughout an AS. It is the fourth decider in a BGP best path after ‘Locally Originated via Network or Aggregate Advertisement’ Interior Gateway Protocols, OSPF or EIGRP, use the lowest path metric to identify the shortest path to a…

  • BGP Communities

    BGP communities can provide additional capability by tagging routers and modifying the BGP policy on other routers that are upstream or downstream. BGP communities are an optional transitive BGP attribute that can travel from AS to AS on a route. The BGP community itself is a 32-bit integer that is included with a route. It…

  • BGP Access Control Lists

    Access Control Lists, ACLs, are traditionally used for a basic filtering of network packets going through as routers interface. Access Control Lists can also be used for providing classification for a number of other router features such as identifying particular networks in a routing protocol like BGP. An ACL consists of Access Control Entries, ACEs.…

  • BGP Route Summarisation

    By reducing the number of routes presented, it can reduce the router resources required to operate the BGP process and reduce the overall size of the BGP table. By summarising routes dynamic route flaps from downstream routers can be hidden from BGP advertisements, providing stability. There are two main techniques for summarising routes: Static Create…