routers. However, tunnel meshing is required as the number of CEs to connect increases, and it is difficult to
delegate a global IPv6 prefix for an ISP.
The following figure illustrates the network architecture using tunnels on the CE routers.
Figure 11: IPv6 Using Tunnels on the CE Routers
IPv6 Provider Edge Multipath
Internal and external BGP multipath for IPv6 allows the IPv6 router to balance load between several paths
(for example, the same neighboring autonomous system (AS) or sub-AS, or the same metrics) to reach its
destination. The 6PE multipath feature uses multiprotocol internal BGP (MP-IBGP) to distribute IPv6 routes
over the MPLS IPv4 core network and to attach an MPLS label to each route.
When MP-IBGP multipath is enabled on the 6PE router, all labeled paths are installed in the forwarding table
with available MPLS information (label stack). This functionality enables 6PE to perform load balancing.
OSPFv3 6VPE
The Open Shortest Path First version 3 (OSPFv3) IPv6 VPN Provider Edge (6VPE) feature adds VPN routing
and forwarding (VRF) and provider edge-to-customer edge(PE-CE) routing support to Cisco IOS XR OSPFv3
implementation. This feature allows:
• Multiple VRF support per OSPFv3 routing process
• OSPFV3 PE-CE extensions
Multiple VRF Support
OSPFv3 supports multiple VRFs in a single routing process that allows scaling to tens and hundreds of VRFs
without consuming too much route processor (RP) resources. Multiple OSPFv3 processes can be configured
on a single router. In large-scale VRF deployments, this allows partition VRF processing across multiple RPs.
It is also used to isolate default routing table or high impact VRFs from the regular VRFs. It is recommended
L3VPN Configuration Guide for Cisco NCS 540 Series Routers, IOS XR Release 6.3.x
57
Implementing IPv6 VPN Provider Edge Transport over MPLS
OSPFv3 6VPE
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