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The Multicast MTR in VRF feature provides Multitopology Routing (MTR) support for multicast and allows you to control the path of multicast traffic in the network.
The Multicast MTR in VRF feature extends to IPv4 and VRF contexts the Cisco IOS software's capability that allows users to configure one or more non-congruent multicast topologies in global IPv4 routing context. These contexts can be used to forward unicast and multicast traffic over different links in the network, or in the case of non-base topologies to provide a Live-Live multicast service using multiple non-congruent multicast topologies mapped to different (S,G) groups.
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.
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 Multicast MTR in VRF
Cisco software supports legacy pre-Multitopology Routing (MTR) IP multicast behavior by default. MTR support for IP multicast must be explicitly enabled. Legacy IP multicast uses reverse path forwarding (RPF) on routes in the unicast Routing Information Base (RIB) to build multicast distribution trees (MDTs).
MTR introduces a multicast topology that is completely independent from the unicast topology. MTR integration with multicast allows you to control the path of multicast traffic in the network.
The multicast topology maintains separate routing and forwarding tables. The following list summarizes MTR multicast support that is integrated into Cisco software:
Conventional longest match support for multicast routes.
RPF support for Protocol Independent Multicast (PIM).
Border Gateway Protocol (BGP) MDT sub address family identifier (SAFI) support for Inter-AS VPNs (SAFI number 66).
Support for static multicast routes integrated into the ip route topology command (modifying the ip mroute command).
As in pre-MTR software, enable multicast support by configuring the ip multicast-routing command in global configuration mode. You enable MTR support for multicast by configuring the ip multicast rpf multitopology command. After the device enters global address family configuration mode, you then enter the topology command with the base keyword; global topology configuration parameters are applied in this mode.
For details on multitopology routing, see “Multitopology Routing” module. For details on MTR in VRF feature, see “MTR in VRF” module.
How to Configure Multicast MTR in VRF
1.
enable
2.
configure
terminal
3.
ip
multicast vrf
vrf-name
topology {unicast |
multicast}
topology-name
tid
topology-number
4.
ip multicast vrf
vrf-name
rpf select topology
{unicast |
multicast}
topology-name
ip acl extended
5.
ip route
vrf
vrf-name
topology
topology-name
destination-address
destination-mask {forwarding-address |
interface [forwarding-address]}
[multicast]
6.
exit
Configuration Examples for Multicast MTR in VRF
! ip multicast vrf kmdvrf topology multicast kmdtopo tid 111 ip multicast vrf kmdvrf rpf select topology multicast kmdtopo ip acl extended ip route vrf kmdvrf topology kmdtopo 10.0.0.0 255.0.0.0 Ethernet 0/0 multicast !
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
|
Multitopology Routing (MTR) commands |
|
IP Multicast commands |
|
Multitopology Routing MTR Support for Multicast MTR in VRF |
Multitopology Routing Configuration Guide |
Description | Link |
---|---|
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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 . An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
---|---|---|
Multicast MTR in VRF |
15.4(2)T |
The Multicast MTR in VRF feature extends to IPv4 and VRF contexts the Cisco IOS software's capability that allows users to configure one or more non-congruent multicast topologies in global IPv4 routing context. The following commands were introduced or modified: ip mulitcast vrf vrf-name topology {unicast | multicast} topology-name tid topology number, ip mulitcast vrf vrf-name rpf select topology {unicast | multicast} topology-name ip acl extended , ip route vrf vrf-name topology topology-name destination-address destination-mask {forwarding-address | interface [forwarding-address]} [multicast] |