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Interface and Hardware Component Configuration Guide, Cisco IOS XE Release 3S
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mGRE Tunnel Support over IPv6
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IP over IPv6 Tunnels
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Manually Configured IPv6 over IPv4 Tunnels
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Configuring Physical Interfaces
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Configuring Virtual Interfaces
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Implementing Tunnels
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Tunnel Route Selection
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MPLS VPN over mGRE
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IP Tunnel MIBs
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IF-MIBs
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Synchronous Ethernet (SyncE) ESMC and SSM
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1+1 SR-APS Without Bridging
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IPv6 Rapid Deployment
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IPv6 Automatic 6to4 Tunnels
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IPv6 over IPv4 GRE Tunnels
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GRE IPv6 Tunnels
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ISATAP Tunnel Support for IPv6
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VRF-Aware Tunnels
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Feedback
Contents
mGRE Tunnel Support over IPv6
mGRE tunnels are configured to enable service providers deploy IPv6 in their core infrastructure.
- Finding Feature Information
- Information About mGRE Tunnel Support over IPv6
- Additional References
- Feature Information for mGRE Tunnel Support over IPv6
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 mGRE Tunnel Support over IPv6
mGRE Support over IPv6
Multiple sites of a DMVPN are interconnected by IPv6. A single logical mGRE tunnel interface interconnects one VPN site to another. An IPv6 subnet connects a tunnel interface with other tunnel interfaces from various VPN sites. All tunnel interfaces connecting VPN sites act as hosts on the logical IPv6 subnet. This structure is referred to as the tunnel overlay network.
mGRE Tunnels Support over IPv6
To enable service providers deploy IPv6 in their core infrastructure, multipoint generic routing encapsulation (mGRE) tunnels over IPv6 are supported. Dynamic Multipoint Virtual Private Network (DMVPN) customers may run either IPv4 or IPv6 in their local networks, so the overlay endpoints can be either IPv4 or IPv6. For an IPv6 transport endpoint, the overlay endpoint can either be an IPv4 or IPv6 private network address.
GRE has a protocol field that identifies the passenger protocol. GRE tunnels allow Intermediate System-to-Intermediate System (IS-IS) or IPv6 to be specified as a passenger protocol, which allows both IS-IS and IPv6 traffic to run over the same tunnel. If GRE did not have a protocol field, it would be impossible to distinguish whether the tunnel was carrying IS-IS or IPv6 packets. The GRE protocol field is why it is desirable that you tunnel IS-IS and IPv6 inside GRE.
Additional References
Related Documents
MIBs
Technical Assistance
Description
Link
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 mGRE Tunnel Support over IPv6
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.