Here is another cut at the VRF text. Thanks to both the on-list and
off-list comments/discussion. Hopefully third time's the charm! :-)
<t>
In the case of IP networks, many routers provide a virtual
routing and forwarding capability whereby a single
router supports multiple "virtual routers", each using its
own forwarding table, i.e., one tied to a specific tenant or
VPN. Each forwarding table instance is populated separately
via routing protocols, and adjacent routers encapsulate
traffic in such a way that the data plane identifies the
tenant or VPN that traffic belongs to. The combination of
virtual router functionality and data plane separation
provides address and traffic isolation for individual
tenants.
</t>
<t>
Virtual routing and forwarding is also used on PEs as part
of providing BGP/MPLS VPN
service <xref target="RFC4364"></xref>. With BGP/MPLS VPNs,
MPLS encapsulation is used to provide tenant separation
across the transport "underlay" network between PEs. When
PEs are connected by MPLS paths, control plane protocols
(e.g., LDP <xref target="RFC5036"></xref>) are used to set
up the data path between PEs. Whether native MPLS paths or
MPLs over GRE encapsulation is
used <xref target="RFC4023"></xref>, BGP distributes the
necessary labels among PEs for tenant separation.
</t>
Thomas
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