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

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Linking the Virtual Router with the MPLS VPN Backbone

The configuration examples in the previous section used the simplest possible connectivity between the multi-VRF CE router and the PE router: Frame Relay subinterfaces. This connectivity type or other connectivity types where you could configure subinterfaces on the same physical interface (such as VLAN-based Ethernet, Fast Ethernet, or Gigabit Ethernet connectivity) are highly recommended because they are simple to configure and produce almost no undesired side effects (apart from the IP quality of service, or QoS, configuration that might be more complex than an equivalent connection on a point-to-point link). There are, however, several new access technologies, such as cable networks, that ...

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