- MPLS Virtual Private Networks
- Multiprotocol BGP MPLS VPN
- MPLS VPN Support for EIGRP Between PE and CE
- IPv6 VPN over MPLS
- Assigning an ID Number to an MPLS VPN
- Multi-VRF Selection Using Policy-Based Routing
- VRF Aware System Message Logging
- MPLS VPN Route Target Rewrite
- MPLS VPN Show Running VRF
- MPLS VPN VRF CLI for IPv4 and IPv6 VPNs
- MPLS VPN VRF Selection Using Policy-Based Routing
- MPLS VPN 6VPE Support Over IP Tunnels
- IPv6 VRF Aware System Message Logging
Contents
- MPLS VPN 6VPE Support Over IP Tunnels
- Finding Feature Information
- Information About MPLS VPN 6VPE Support Over IP Tunnels
- MPLS Forwarding
- 6VPE over GRE Tunnels
- Additional References
- Feature Information for MPLS VPN 6VPE Support Over IP Tunnels
MPLS VPN 6VPE Support Over IP Tunnels
This feature allows the use of IPv4 generic routing encapsulation (GRE) tunnels to provide IPv6 Virtual Private Network (VPN) over Multiprotocol Label Switching (MPLS) functionality to reach the Border Gateway Protocol (BGP) next hop.
- Finding Feature Information
- Information About MPLS VPN 6VPE Support Over IP Tunnels
- Additional References
- Feature Information for MPLS VPN 6VPE Support Over IP Tunnels
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Information About MPLS VPN 6VPE Support Over IP Tunnels
MPLS Forwarding
When it receives IPv6 traffic from one customer site, the ingress provider edge (PE) device uses Multiprotocol Label Switching (MPLS) to tunnel IPv6 Virtual Private Network (VPN) packets over the backbone toward the egress PE device identified as the Border Gateway Protocol (BGP) next hop. The ingress PE device prepends the IPv6 packets with the outer and inner labels before putting the packet on the egress interface.
Under normal operation, a provider (P) device along the forwarding path does not look inside the frame beyond the first label. The provider (P) device either swaps the incoming label with an outgoing one or removes the incoming label if the next device is a PE device. Removing the incoming label is called penultimate hop popping. The remaining label (BGP label) is used to identify the egress PE interface toward the customer site. The label also hides the protocol version (IPv6) from the last P device, which it would otherwise need to forward an IPv6 packet.
A P device is ignorant of the IPv6 VPN routes. The IPv6 header remains hidden under one or more MPLS labels. When the P device receives an MPLS-encapsulated IPv6 packet that cannot be delivered, it has two options. If the P device is IPv6 aware, it exposes the IPv6 header, builds an Internet Control Message Protocol (ICMP) for IPv6 message, and sends the message, which is MPLS encapsulated, to the source of the original packet. If the P device is not IPv6 aware, it drops the packet.
6VPE over GRE Tunnels
In some Cisco software releases, the ingress provider edge (PE) device uses IPv4 generic routing encapsulation (GRE) tunnels combined with IPv6 over MPLS (6VPE) over Multiprotocol Label Switching (MPLS) to tunnel IPv6 Virtual Private Network (VPN) packets over the backbone toward the egress PE device identified as the Border Gateway Protocol (BGP) next hop.
Additional References
Related Documents
Related Topic |
Document Title |
|---|---|
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Cisco IOS commands |
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IPv6 addressing and connectivity |
IPv6 Configuration Guide Library |
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IPv6 commands |
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Cisco IOS IPv6 features |
Standards and RFCs
Standard/RFC |
Title |
|---|---|
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RFCs for IPv6 |
Technical Assistance
Description |
Link |
|---|---|
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for MPLS VPN 6VPE Support Over IP Tunnels
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
|---|---|---|
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MPLS VPN 6VPE Support Over IP Tunnels |
12.2(33)SRB1 12.2(33)SXI Cisco IOS XE Release 3.1S |
This feature allows the use of IPv4 GRE tunnels to provide IPv6 VPN over MPLS functionality to reach the BGP next hop. |