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Implementing Multicast Routing on Cisco IOS XR Software
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
116.
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:
• Maintain multicast topology maps across VRFs.
• Maintain multicast distribution trees to forward traffic across VRFs.
Information About Extranets
An extranet can be viewed as part of an enterprise intranet that is extended to users outside the enterprise. A
VPN is used as a way to do business with other enterprises and with customers, such as selling products and
maintaining strong business partnerships. An extranet is a VPN that connects to one or more corporate sites
to external business partners or suppliers to securely share a designated part of the enterprise's business
information or operations.
MVPN extranet routing can be used to solve such business problems as:
• Inefficient content distribution between enterprises.
• Inefficient content distribution from service providers or content providers to their enterprise VPN
MVPN extranet routing provides support for IPv4 and IPv6 address family.
An extranet network requires the PE routers to pass traffic across VRFs (labeled "P" in
of an Extranet MVPN, on page
always runs only IPv4 active multicast.
Multicast extranet routing is not supported on BVI interfaces.
Note
customers.
24). Extranet networks can run either IPv4 or IPv6, but the core network
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
Multicast VPN Extranet Routing
Configuring Multitopology Routing, on page
Figure 6: Components
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