Customer Carrier: Mpls Service Provider; Ipv6 Vpn Provider Edge (6Vpe) Support; 6Vpe Benefits - Cisco CRS Configuration Manual

IPv6 VPN Provider Edge (6VPE) Support

Customer Carrier: MPLS Service Provider

The following figure shows a network configuration where the backbone carrier and the customer carrier are
BGP/MPLS VPN service providers. The customer carrier has two sites. The customer carrier uses MPLS in
its network while the backbone carrier may use MPLS or IP tunnels in its network.
Figure 37: Network: Customer Carrier Is an MPLS VPN Service Provider
In Network: Customer Carrier Is an MPLS VPN Service Provider configuration, the customer carrier can
configure its network in one of these ways:
• The customer carrier can run an IGP and LDP in its core network. In this case, the CSC-CE1 router in
• The CSC-CE1 router of the customer carrier system can run an IPv4 and labels iBGP session with the

IPv6 VPN Provider Edge (6VPE) Support

6VPE uses the existing MPLS IPv4 core infrastructure for IPv6 transports to enable IPv6 sites to communicate
over an MPLS IPv4 core network using MPLS label switch paths (LSPs). 6VPE relies on multiprotocol BGP
extensions in the IPv4 network configuration on the provider edge (PE) router to exchange IPv6 reachability
information. Edge routers are then configured to be dual stacks running both IPv4 and IPv6, and use the IPv4
mapped IPv6 address for IPv6 prefix reachability exchange, see
This section includes the follow subsections:

6VPE Benefits

6VPE provides the following benefits to service providers:
• Support for IPv6 without changing the IPv4 MPLS backbone.
• No requirement for a separate signaling plane.
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
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the customer carrier redistributes the eBGP routes it learns from the CSC-PE1 router of the backbone
carrier to an IGP
PE1 router.
Implementing MPLS Layer 3 VPNs
"Dual
Stack".