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Implementing Multicast Routing on Cisco IOS XR Software
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
VPN-A, it replicates and forwards the packets to PE2 and PE3. The packets received at PE2 in VPN-A are
decapsulated and replicated to receivers in VPN-B.
Figure 7: Source MVRF at the Receiver PE Router
Receiver MVRF on the Source PE Router
To provide extranet MVPN services to enterprise VPN customers by configuring the receiver MVRF on the
source PE router, complete the following procedure:
• For each extranet site, you would configure an additional MVRF on the source PE router, which has the
same default MDT group as the receiver MVRF, if the MVRF is not already configured on the source
PE.
• In the receiver MVRF configuration, you would configure the same unicast routing policy on the source
and receiver PE routers to import routes from the source MVRF to the receiver MVRF.
If the originating MVRF of the RPF next-hop is remote (receiver MVRF on the source PE router), then the
join state of receiver VRFs propagates over the core through the MDT of each receiver.
Figure 8: Receiver MVRF at the Source PE Router Receiver, on page 26
traffic in an extranet MVPN topology where a receiver MVRF is configured on the source PE router. An
MVRF is configured for VPN-A and VPN-B on PE1, the source PE router. A multicast source behind PE1
is sending out a multicast stream to the MVRF for VPN-A, and there are interested receivers behind PE2 and
PE3, the receiver PE routers for VPN-B and VPN-A, respectively. After PE1 receives the packets from the
source in the MVRF for VPN-A, it independently replicates and encapsulates the packets in the MVRF for
Figure 7: Source MVRF at the Receiver PE Router, on page 25
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
Multicast VPN Extranet Routing
illustrates the flow of multicast
illustrates the flow of multicast
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