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Configuring IPv6 MPLS L3VPN
Overview
IPv6 MPLS L3VPN uses BGP to advertise IPv6 VPN routes and uses MPLS to forward IPv6 VPN
packets on the service provider backbone.
Figure 75 shows a typical IPv6 MPLS L3VPN model. The service provider backbone in the IPv6
MPLS L3VPN model is an IPv4 network. IPv6 runs inside the VPNs and between CE and PE.
Therefore, PEs must support both IPv4 and IPv6. The PE-CE interfaces of a PE run IPv6, and the
PE-P interface of a PE runs IPv4.
Figure 75 Network diagram for the IPv6 MPLS L3VPN model
IPv6 MPLS L3VPN packet forwarding
Figure 76 IPv6 MPLS L3VPN packet forwarding diagram
As shown in Figure 76, the IPv6 MPLS L3VPN packet forwarding procedure is as follows:
1. The PC at Site 1 sends an IPv6 packet destined for 2001:2::1, the PC at Site 2. CE 1 transmits
the packet to PE 1.
VPN
1
CE
IPv6 Site 1
VPN 2
CE
CE
CE
IPv6 Site 3
VPN 2
PE
VPN 1
IPv6
Site 2
IPv
6 Site 4
PE
PE
P
P
P
P
IPv4 network
CE 1Site 1
PE 1
P P
PE
2
CE 2
Site 2
2001:1
::1
/96
2001
:2::1
2001:2::1
Layer2
Layer1
2001:2::1/96
2001:2::1
Layer2
2001:2::1
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