Hierarchy of Routing Knowledge Module

Hierarchy of Routing Knowledge Module

• How to keep interior routers away from maintaining exterior routing information ?
  • allow a packet to carry a “stack” of tags
    • between domains use tags associated with exterior routes
      • BGP tag
    • within a domain use tags associated with interior routes to BGP border routers of the domain
      • IGP tag + BGP tag
      • IGP tag is associated with a group of routes (address prefixes)
        all reachable through the same BGP border router
      • IGP tags could be used without BGP tags

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