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Interface and Hardware Component Configuration Guide, Cisco IOS Release 15M&T
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mGRE Tunnel Support over IPv6
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IP over IPv6 Tunnels
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IPv6 Rapid Deployment
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Configuring LAN Interfaces
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Configuring Serial Interfaces
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Circuit Emulation over IP
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Lossless Compression R1 ATM Cell Switching and External BITS Clocking Source
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Minimal Disruptive Restart of VIP Cards
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Rate Based Satellite Control Protocol
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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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Managing Dial Shelves
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Router-Shelf Redundancy for the Cisco AS5800
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Route-Switch-Controller Handover Redundancy on the Cisco AS5850
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Route Processor Redundancy Plus (RPR+)
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Manually Configured IPv6 over IPv4 Tunnels
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IPv6 Automatic 6to4 Tunnels
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IPv6 Automatic IPv4-Compatible Tunnels
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IPv6 GRE Tunnels in CLNS Networks
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ISATAP Tunnel Support for IPv6
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IPv6 over IPv4 GRE 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
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
| Related Topic | Document Title |
|---|---|
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IPv6 addressing and connectivity |
IPv6 Configuration Guide |
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Cisco IOS commands |
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IPv6 commands |
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Cisco IOS IPv6 features |
Cisco IOS IPv6 Feature Mapping |
MIBs
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 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.
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.