Feedback
Contents
- HSRP: Global IPv6 Address
- Finding Feature Information
- Information About HSRP Global IPv6 Address
- HSRP Global IPv6 Address
- How to Enable HSRP Global IPv6 Address
- Enabling and Verifying an HSRP Group for IPv6 Operation
- Configuration Example for HSRP Global IPv6 Address
- Example: Configuring HSRP Global IPv6 Addresses
- Additional References
- Feature Information for HSRP: Global IPv6 Address
- Glossary
HSRP: Global IPv6 Address
IPv6 routing protocols ensure device-to-device resilience and failover. However, in situations in which the path between a host and the first-hop device fails, or the first-hop device itself fails, first hop redundancy protocols (FHRPs) ensure host-to-device resilience and failover.
The Hot Standby Router Protocol (HSRP) protects data traffic in case of a gateway failure.
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 HSRP Global IPv6 Address
HSRP Global IPv6 Address
 Note | This feature is supported only in Cisco IOS Release 12.2(33)SXI4. |
The HSRP global IPv6 address feature allows users to configure multiple nonlink local addresses as virtual addresses, and it allows for the storage and management of multiple global IPv6 virtual addresses in addition to the existing primary link-local address. If an IPv6 address is used, it must include an IPv6 prefix length. If a link-local address is used, it must not have a prefix.
The figure below depicts a deployment scenario that uses an HSRP IPv6 global virtual interface:
In the figure above, the provider equipment (PE) devices need to inject a route to reach the customer premises equipment (CPE) from the backbone devices. Because there are two CPEs, HSRP is convenient to use. The static route will be set with a link-local next hop (FE80::1:1:1:CAFE). If this address is injected in the backbone, this route is useless with a link-local next hop, as link-local addresses only have scope within the Layer 2 local LAN space. To address this issue, the next hop of the static route toward the virtual address must be set to a nonlink-local address, so backbone devices can route packets to the PE devices. At the next-hop address resolution, the active HSRP group member will reply to neighbor solicitation (NS) messages sent to the nonlink-local address.
How to Enable HSRP Global IPv6 Address
Enabling and Verifying an HSRP Group for IPv6 Operation
In this task, when you enter the standby ipv6 command, a modified EUI-64 format interface identifier is generated in which the EUI-64 interface identifier is created from the relevant HSRP virtual MAC address.
In IPv6, a device on the link advertises in RA messages any site-local and global prefixes, and its willingness to function as a default device for the link. RA messages are sent periodically and in response to router solicitation (RS) messages, which are sent by hosts at system startup.
A node on the link can automatically configure site-local and global IPv6 addresses by appending its interface identifier (64 bits) to the prefixes (64 bits) included in the RA messages. The resulting 128-bit IPv6 addresses configured by the node are then subjected to duplicate address detection to ensure their uniqueness on the link. If the prefixes advertised in the RA messages are globally unique, then the IPv6 addresses configured by the node are also guaranteed to be globally unique. RS messages, which have a value of 133 in the Type field of the ICMPv6 packet header, are sent by hosts at system startup so that the host can immediately autoconfigure without needing to wait for the next scheduled RA message.
DETAILED STEPS
Configuration Example for HSRP Global IPv6 Address
Example: Configuring HSRP Global IPv6 Addresses
This example shows three HSRP global IPv6 addresses with an explicitly configured link-local address:
interface Ethernet0/0 no ip address ipv6 address 2001::DB8:1/64 standby version 2 standby 1 ipv6 FE80::1:CAFÃ standby 1 ipv6 2001::DB8:2/64 standby 1 ipv6 2001:DB8::3/64 standby 1 ipv6 2001:DB8::4/64 end
Additional References
Related Documents
| Related Topic | Document Title |
|---|---|
|
IPv6 addressing and connectivity |
IPv6 Configuration Guide |
|
Cisco IOS commands |
|
|
IPv6 commands |
Cisco IOS IPv6 Command Reference |
|
Cisco IOS IPv6 features |
Cisco IOS IPv6 Feature Mapping |
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 HSRP: Global IPv6 Address
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.
| Table 1 | Feature Information for HSRP: Global IPv6 Address |
| Feature Name | Releases | Feature Information |
|---|---|---|
|
HSRP: Global IPv6 Address |
12.2(33)SXI4 15.3(1)S Cisco IOS XE Release 3.2SE |
The HSRP global IPv6 address feature allows users to configure multiple non-link local addresses as virtual addresses. The following command was introduced: standby ipv6. |
Glossary
- CPE --Customer premises equipment
- FHRP --First hop redundancy protocol
- GLBP --Gateway load balancing protocol
- HSRP --Hot standby routing protocol
- NA --Neighbor advertisement
- ND --Neighbor Discovery
- NS --Neighbor solicitation
- PE --Provider equipment
- RA --Router advertisement
- RS --Router solicitation
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.