Cisco XR 12000 Series Configuration Guide

Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
Information About Implementing Multicast Routing
MCC-15
Multicast Configuration Guide
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MVPN IPv4 and IPv6 Connectivity
MVPN IPv4 and IPv6 Connectivity MPVN services occur over IPv4 core networks. IPv6 connectivity
is supported between customer sites over an IPv4-only core network with a default VRF. VPN PE routers
must interoperate between the two address families, with control and forwarding between
IPv4-encapsulated MDTs and IPv6 customer routes. In this document, therefore, MVPNv4 refers to the
core network, while MVPNv6 refers to IPv6-over-IPv4 functionality.
IPv4 generic routing encapsulation (GRE) multicast distribution trees (MDTs) are supported over the
service provider network, while IPv6-encapsulated MDTs are currently unsupported. However, on the
Cisco
XR 12000 Series Router, IPv6 users can configure IPv6-over-IPv4 multcast VPN support through
BGP. For information, see
Configuring IPv6 Multicast VPN on the Cisco XR 12000 Series Router:
Example, page MCC-79.
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 IOS XR 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.
For information on how to configure multitopology routing, see Configuring Multitopology Routing,
page MCC-50.
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.

Cisco XR 12000 Series Specifications

General

Brand	Cisco
Model	XR 12000 Series
Category	Network Router
Language	English