MDTs and IPv6 customer routes. IPv6 users can configure IPv6-over-IPv4 multicast VPN support through
BGP.
In Cisco IOS XR Software, MVPNv6 can have a separate data mdt group configured, which can be different
from MVPNv4. But both MVPNv6 and MVPNv4 must have the same default mdt group configured.
The configuration example below shows MVPNv6 data mdt :
vrf cisco-sjc1
address-family ipv4
mdt data 226.8.3.0/24 threshold 5
mdt default ipv4 226.8.0.1
!
address-family ipv6
mdt data 226.8.4.0/24 threshold 5
mdt default ipv4 226.8.0.1
!
BGP Requirements
PE routers are the only routers that need to be MVPN-aware and able to signal remote PEs with information
regarding the MVPN. It is fundamental that all PE routers have a BGP relationship with each other, either
directly or through a route reflector, because the PE routers use the BGP peering address information to derive
the RPF PE peer within a given VRF.
PIM-SSM MDT tunnels cannot be set up without a configured BGP MDT address-family, because you
establish the tunnels, using the BGP connector attribute.
See the Implementing BGP on Cisco IOS XR Software module of the Cisco ASR 9000 Series Aggregation
Services Router Routing Configuration Guide for information on BGP support for Multicast VPN.
Multitopology Routing
Multitopology routing allows you to manipulate network traffic flow when desirable (for example, to broadcast
duplicate video streams) to flow over non-overlapping paths.
At the core of multitopology routing technology is router space infrastructure (RSI). RSI manages the global
configuration of routing tables. These tables are hierarchically organized into VRF tables under logical routers.
By default, RSI creates tables for unicast and multicast for both IPv4 and IPv6 under the default VRF. Using
multitopology routing, you can configure named topologies for the default VRF.
PIM uses a routing policy that supports matching on source or group address to select the topology in which
to look up the reverse-path forwarding (RPF) path to the source. If you do not configure a policy, the existing
behavior (to select a default table) remains in force.
Currently, IS-IS and PIM routing protocols alone support multitopology-enabled network.
Multicast VPN Extranet Routing
Multicast VPN (MVPN) extranet routing lets service providers distribute IP multicast content from one
enterprise site to another across a multicast VRF. In other words, this feature provides capability to seamlessly
hop VRF boundaries to distribute multicast content end to end.
Unicast extranet can be achieved simply by configuring matching route targets across VRFs. However,
multicast extranet requires such configuration to resolve route lookups across VRFs in addition to the following:
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.1.x
20
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
Multitopology Routing
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