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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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Overview of BGP/MPLS IPv6 VPN

Overview of BGP/MPLS IPv6 VPN

This section describes the similarities and differences between BGP/MPLS IPv6 VPN and BGP/MPLS IP VPN.

As an enhanced version of IPv4, IPv6 is an Internet protocol of the next generation. IPv6 provides the enhanced address space, configuration, maintenance, and security functions, and supports more access users and devices in the Internet than IPv4.

A VPN is a virtual private communication network built over shared links or public networks, such as the Internet. Users located in different areas can exchange data over shared links or public networks.

IPv6 VPN and IPv4 VPN are different in the packet format. On an IPv6 VPN, CEs send IPv6 packets to PEs, whereas on an IPv4 VPN, CEs send IPv4 packets to PEs.

BGP/MPLS IPv6 VPN networking solutions include:
  • Solution using carriers' IPv4 backbone networks to carry IPv6 VPN services (also called the 6VPE solution)

  • Solution using carriers' IPv6 backbone networks to carry IPv6 VPN services

Currently, only the 6VPE solution is supported. In this situation, PEs must support IPv4/IPv6 dual-stack because the backbone network runs IPv4 and customer sites use IPv6 address families, as shown in Figure 6-1. Any network protocol that supports IPv6 services can be used to set up connections between CEs and PEs. PEs use IPv6 on interfaces connected to customer sites and IPv4 on interfaces connected to the core network.

Figure 6-1 IPv6 VPN over an IPv4 public network

IPv6 VPN uses MP-BGP to advertise VPNv6 routes on the backbone network, triggers MPLS to allocate labels for IPv6 packet identification, and uses LSPs and MPLS TE tunnels to transmit VPN services on the backbone network. The working principle is similar to that of BGP/MPLS IP VPN.

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Updated: 2019-01-14

Document ID: EDOC1100058925

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