BGP extended community attributes

• The distribution of VPN routing information is constrained through the use of BGP extended community attributes (32-bit).

• BGP/MPLS VPN can use up to three different types of BGP extended community attributes

  • The route target attribute identifies a collection of sites (VRFs) to which a PE router distributes routes. A PE router uses this attribute to constrain the import of remote routes into its VRFs.
  • The VPN-of-origin attribute
  • The site-of-origin attribute

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