IPv6 Source Specific Multicast Mapping
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IPv6 Source Specific Multicast Mapping

Last Updated: July 17, 2012

Source-specific multicast (SSM) SSM mapping for IPv6 supports both static and dynamic Domain Name System (DNS) mapping for MLD version 1 receivers. This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

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 IPv6 Source Specific Multicast Mapping

SSM mapping for IPv6 supports both static and dynamic Domain Name System (DNS) mapping for MLD version 1 receivers. This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

SSM mapping allows the device to look up the source of a multicast MLD version 1 report either in the running configuration of the device or from a DNS server. The device can then initiate an (S, G) join toward the source.

How to Configure IPv6 Source Specific Multicast Mapping

Configuring IPv6 SSM

When the SSM mapping feature is enabled, DNS-based SSM mapping is automatically enabled, which means that the device will look up the source of a multicast MLD version 1 report from a DNS server.

You can configure either DNS-based or static SSM mapping, depending on your device configuration. If you choose to use static SSM mapping, you can configure multiple static SSM mappings. If multiple static SSM mappings are configured, the source addresses of all matching access lists will be used.

Before You Begin

Note
To use DNS-based SSM mapping, the device needs to find at least one correctly configured DNS server to which the device can be directly attached.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ipv6 mld [vrf vrf-name] ssm-map enable

4.    no ipv6 mld [vrf vrf-name] ssm-map query dns

5.    ipv6 mld [vrf vrf-name] ssm-map static access-list source-address

6.    end

7.    show ipv6 mld [vrf vrf-name] ssm-map [source-address]


DETAILED STEPS
Step 1   enable


Example: 
Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2   configure terminal


Example: 
Device# configure terminal

Enters global configuration mode.

Step 3   ipv6 mld [vrf vrf-name] ssm-map enable


Example: 
Device(config)# ipv6 mld ssm-map enable

Enables the SSM mapping feature for groups in the configured SSM range.

Step 4   no ipv6 mld [vrf vrf-name] ssm-map query dns


Example: 
Device(config)# no ipv6 mld ssm-map query dns

Disables DNS-based SSM mapping.

Step 5   ipv6 mld [vrf vrf-name] ssm-map static access-list source-address


Example: 
Device(config)# ipv6 mld ssm-map static SSM_MAP_ACL_2 2001:DB8:1::1

Configures static SSM mappings.

Step 6   end


Example: 
Device(config-if)# end

Returns to privileged EXEC mode.

Step 7   show ipv6 mld [vrf vrf-name] ssm-map [source-address]


Example: 
Device# show ipv6 mld ssm-map

Displays SSM mapping information.

Configuration Examples for IPv6 Source Specific Multicast Mapping

Example: IPv6 SSM Mapping

Device# show ipv6 mld ssm-map 2001:DB8::1

 Group address  : 2001:DB8::1
 Group mode ssm : TRUE
 Database       : STATIC
 Source list    : 2001:DB8::2
                  2001:DB8::3

Device# show ipv6 mld ssm-map 2001:DB8::2

 Group address  : 2001:DB8::2
 Group mode ssm : TRUE
 Database       : DNS
 Source list    : 2001:DB8::3
                  2001:DB8::1

Additional References

Related Documents

Related Topic Document Title

IPv6 addressing and connectivity

IPv6 Configuration Guide

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IP multicast commands

Cisco IOS IP Multicast Command Reference

IPv6 commands

Cisco IOS IPv6 Command Reference

Cisco IOS IPv6 features

Cisco IOS IPv6 Feature Mapping

Standards and RFCs

Standard/RFC Title

RFCs for IPv6

IPv6 RFCs

MIBs

MIB

MIBs Link

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/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.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for IPv6 Source Specific Multicast Mapping

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 1Feature Information for IPv6 Source Specific Multicast Mapping
Feature Name Releases Feature Information

IPv6 Source Specific Multicast Mapping

12.2(33)SRA

12.2(18)SXE

12.4(2)T

Cisco IOS XE Release 2.1

15.0(1)S

This feature allows deployment of IPv6 SSM with hosts that are incapable of providing MLD version 2 support in their TCP/IP host stack and their IP multicast receiving application.

The following commands were introduced or modified: ipv6 mld ssm-map enable, ipv6 mld ssm-map query dns, ipv6 mld ssm-map static, show ipv6 mld ssm-map.

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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.

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