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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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VRF Selection Based on Source IP Address

In the traditional implementation of the MPLS VPN architecture in Cisco IOS, each physical or logical interface was associated with one VRF table, resulting in a one-VPN-per-interface design limitation. Service providers that wanted to offer access to different VPN networks (or different upstream ISPs) to many customers who were connected to a shared media (cable or Ethernet infrastructure) first encountered this limitation.

In situations in which more than one VPN customer had to be connected to a single physical interface, the following solutions were available:

  • VPN customers who were connected to a LAN interface were split into multiple virtual LANs (VLAN), each VLAN subinterface belonging to a different ...

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