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Contents
- IPv6 Multicast: Routable Address Hello Option
- Finding Feature Information
- Information About the Routable Address Hello Option
- How to Configure IPv6 Multicast: Routable Address Hello Option
- Configuring the Routable Address Hello Option
- Configuration Example for the Routable Address Hello Option
- Additional References
- Feature Information for IPv6 Multicast: Routable Address Hello Option
IPv6 Multicast: Routable Address Hello Option
The routable address hello option adds a PIM hello message option that includes all the addresses on the interface on which the PIM hello message is advertised.
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 the Routable Address Hello Option
When an IPv6 interior gateway protocol is used to build the unicast routing table, the procedure to detect the upstream device address assumes the address of a PIM neighbor is always same as the address of the next-hop device, as long as they refer to the same device. However, it may not be the case when a device has multiple addresses on a link.
Two typical situations can lead to this situation for IPv6. The first situation can occur when the unicast routing table is not built by an IPv6 interior gateway protocol such as multicast BGP. The second situation occurs when the address of an RP shares a subnet prefix with downstream devices (note that the RP address has to be domain-wide and therefore cannot be a link-local address).
The routable address hello option allows the PIM protocol to avoid such situations by adding a PIM hello message option that includes all the addresses on the interface on which the PIM hello message is advertised. When a PIM device finds an upstream device for some address, the result of RPF calculation is compared with the addresses in this option, in addition to the PIM neighbor's address itself. Because this option includes all the possible addresses of a PIM device on that link, it always includes the RPF calculation result if it refers to the PIM device supporting this option.
Because of size restrictions on PIM messages and the requirement that a routable address hello option fits within a single PIM hello message, a limit of 16 addresses can be configured on the interface.
How to Configure IPv6 Multicast: Routable Address Hello Option
Configuring the Routable Address Hello Option
DETAILED STEPS
Configuration Example for the Routable Address Hello Option
The following example shows output from the show ipv6 pim neighbor command using the detail keyword to identify the additional addresses of the neighbors learned through the routable address hello option:
Device# show ipv6 pim neighbor detail
Neighbor Address(es) Interface Uptime Expires DR pri Bidir
FE80::A8BB:CCFF:FE00:401 Ethernet0/0 01:34:16 00:01:16 1 B
60::1:1:3
FE80::A8BB:CCFF:FE00:501 Ethernet0/0 01:34:15 00:01:18 1 B
60::1:1:4
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 IPv6 Multicast: Routable Address Hello Option
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 IPv6 Multicast: Routable Address Hello Option |
| Feature Name | Releases | Feature Information |
|---|---|---|
|
IPv6 Multicast: Routable Address Hello Option |
12.0(26)S 12.3(4)T 12.2(25)S 12.2(25)SG 12.2(33)SRA 12.2(33)SXH 12.4 12.4(2)T Cisco IOS XE Release 2.4 15.0(1)S |
The routable address hello option adds a PIM hello message option that includes all the addresses on the interface on which the PIM hello message is advertised. The following commands were introduced or modified: ipv6 pim hello-interval, show ipv6 pim neighbor. |
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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.