Cisco ASR 9000 Series Software Manual page 22

Multicast VPN Extranet Routing
table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general,
a VRF includes the routing information that defines a customer VPN site that is attached to a provider edge
(PE) router.
Source MVRF—An MVRF that can reach the source through a directly connected customer edge (CE) router.
Receiver MVRF—An MVRF to which receivers are connected through one or more CE devices.
Source PE—A PE router that has a multicast source behind a directly connected CE router.
Receiver PE—A PE router that has one or more interested receivers behind a directly connected CE router.
Information About the Extranet MVPN Routing Topology
In unicast routing of peer-to-peer VPNs, BGP routing protocol is used to advertise VPN IPv4 and IPv6
customer routes between provider edge (PE) routers. However, in an MVPN extranet peer-to-peer network,
PIM RPF is used to determine whether the RPF next hop is in the same or a different VRF and whether that
source VRF is local or remote to the PE.
Source MVRF on a Receiver PE Router
To provide extranet MVPN services to enterprise VPN customers by configuring a source MVRF on a receiver
PE router, you would complete the following procedure:
• On a receiver PE router that has one or more interested receivers in an extranet site behind a directly
connected CE router, configure an MVRF that has the same default MDT group as the site connected
to the multicast source.
• On the receiver PE router, configure the same unicast routing policy to import routes from the source
MVRF to the receiver MVRF.
If the originating MVRF of the RPF next hop is local (source MVRF at receiver PE router), the join state of
the receiver VRFs propagates over the core by using the default multicast distribution tree (MDT) of the
source VRF.
traffic in an extranet MVPN topology where the source MVRF is configured on a receiver PE router (source
at receiver MVRF topology). An MVRF is configured for VPN-A and VPN-B on PE2, a receiver PE router.
A multicast source behind PE1, the source PE router, is sending out a multicast stream to the MVRF for
VPN-A, and there are interested receivers behind PE2, the receiver PE router for VPN-B, and also behind
PE3, the receiver PE router for VPN-A. After PE1 receives the packets from the source in the MVRF for
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.1.x
22
Figure 7: Source MVRF at the Receiver PE Router, on page 23
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
illustrates the flow of multicast