IPv6 Multicast: Static Multicast Routing for IPv6

IPv6 static multicast routes, or mroutes, share the same database as IPv6 static routes and are implemented by extending static route support for reverse path forwarding (RPF) checks.

Information About IPv6 Static Mroutes

IPv6 static mroutes behave much in the same way as IPv4 static mroutes used to influence the RPF check. IPv6 static mroutes share the same database as IPv6 static routes and are implemented by extending static route support for RPF checks. Static mroutes support equal-cost multipath mroutes, and they also support unicast-only static routes.

How to Configure IPv6 Static Multicast Routes

Configuring Static Mroutes

Static multicast routes (mroutes) in IPv6 can be implemented as an extension of IPv6 static routes. You can configure your device to use a static route for unicast routing only, to use a static multicast route for multicast RPF selection only, or to use a static route for both unicast routing and multicast RPF selection.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. ipv6 route ipv6-prefix / prefix-length ipv6-address | interface-type interface-number ipv6-address ]} [administrative-distance ] [administrative-multicast-distance | unicast | multicast ] [tag tag
  4. end
  5. show ipv6 mroute [vrf vrf-name ] [link-local | [group-name | group-address [source-address | source-name ]] [summary ] [count ]
  6. show ipv6 mroute [vrf vrf-name ] [link-local | group-name | group-address ] active [kbps ]
  7. show ipv6 rpf [vrf vrf-name ] ipv6-prefix

DETAILED STEPS

  Command or Action Purpose

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 route ipv6-prefix / prefix-length ipv6-address | interface-type interface-number ipv6-address ]} [administrative-distance ] [administrative-multicast-distance | unicast | multicast ] [tag tag

Example:


Device(config)# ipv6 route 2001:DB8::/64 6::6 100

Establishes static IPv6 routes. The example shows a static route used for both unicast routing and multicast RPF selection.

Step 4

end

Example:


Device(config-if)# end

Exits to privileged EXEC mode.

Step 5

show ipv6 mroute [vrf vrf-name ] [link-local | [group-name | group-address [source-address | source-name ]] [summary ] [count ]

Example:


Device# show ipv6 mroute ff07::1

Displays the contents of the IPv6 multicast routing table.

Step 6

show ipv6 mroute [vrf vrf-name ] [link-local | group-name | group-address ] active [kbps ]

Example:


Device# show ipv6 mroute active

Displays the active multicast streams on the device.

Step 7

show ipv6 rpf [vrf vrf-name ] ipv6-prefix

Example:


Device# show ipv6 rpf 2001:DB8::1:1:2

Checks RPF information for a given unicast host address and prefix.

Configuration Examples for IPv6 Static Multicast Routes

Example: Configuring Static Mroutes

Using the show ipv6 mroute command allows you to verify that multicast IPv6 data is flowing: 

Device# show ipv6 mroute ff07::1

Multicast Routing Table
Flags:D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, 
       C - Connected, L - Local, I - Received Source Specific Host Report,
       P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set,
       J - Join SPT 
Timers:Uptime/Expires
Interface state:Interface, State

(*, FF07::1), 00:04:45/00:02:47, RP 2001:DB8:6::6, flags:S
  Incoming interface:Tunnel5
  RPF nbr:6:6:6::6
  Outgoing interface list:
    POS4/0, Forward, 00:04:45/00:02:47

(2001:DB8:999::99, FF07::1), 00:02:06/00:01:23, flags:SFT
  Incoming interface:POS1/0
  RPF nbr:2001:DB8:999::99
  Outgoing interface list:
    POS4/0, Forward, 00:02:06/00:03:27

The following sample output displays information from the show ipv6 mroute active command: 

Device# show ipv6 mroute active

Active IPv6 Multicast Sources - sending >= 4 kbps
Group:FF05::1
 Source:2001:DB8:1:1:1
   Rate:11 pps/8 kbps(1sec), 8 kbps(last 8 sec)

The following example displays RPF information for the unicast host with the IPv6 address of 2001:DB8:1:1:2: 

Device# show ipv6 rpf 2001:DB8:1:1:2

RPF information for 2001:DB8:1:1:2
  RPF interface:Ethernet3/2
  RPF neighbor:FE80::40:1:3
  RPF route/mask:20::/64
  RPF type:Unicast
  RPF recursion count:0
  Metric preference:110
  Metric:30

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 Multicast: Static Multicast Routing for 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 https://cfnng.cisco.com/. An account on Cisco.com is not required.