Chapter 19
6VPE Configuration
Table of Contents
19.1 6VPE Overview
IPv6 VPN Provider Edge (
) is a technology that provides BGP Multi Protocol Label
Switching (
) service on an IPv6 network. The 6VPE
technology originates from IPv4 BGP MPLS VPN. It is an extension of the IPv4 BGP MPLS
VPN.
The handling procedure on the 6VPE control plane consists of six steps.
1.
6VPE uses IPv4/IPv6 IGP (such as OSPF/OSPFv3) to establish the routes among
backbone routers. The loopback address of a 6VPE router is advertised to all P routers
and other 6VPE routers on the network.
2.
6VPE uses IPv4/IPv6 label distribution protocols (such as Label Distribution Protocol
), Resource ReSerVation Protocol-Traffic Engineering (
)) to establish
Label Switch Paths (
s) among 6VPE routers, that is, the MPLS tunnels among
6VPE routers.
3.
6VPE routers contact each other according to the VPN route reachability information.
It is necessary to configure IPv4/IPv6 Virtual Route Forwarding (
).
4.
6VPE routers obtain route reachability information from Customer Edge (
) routers
on IPv4/IPv6 sites.
5.
6VPE routers distribute labels for route reachability information, and advertise the
reachability information for address prefixes in VPNs through the extended attributes
of MP-BGP. If the user network that 6VPE routers connected to uses the IPv4
protocol, the route reachability information uses VPN-IPv4 address family. If the user
network that 6VPE routers connected to uses the IPv6 protocol, the route reachability
information uses new-defined VPN-IPv6 address family.
6.
6VPE routers advertise IPv4/IPv6 route reachability information to IPv4/IPv6 CE sites
through IPv4/IPv6 routing protocols.
According to the 6VPE handling procedure, the key part of 6VPE is that the VPN-IPv6
address family is defined to distinguish the IPv6 routing information from different VPNs.
VPN-IPv6 is a new-defined address family. In the extended attributes of MP-BGP, the
codes of VPN-IPv6 address family are expressed as:
l
AFI = 2: indicating IPv6
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