Components Of Multicast Extranet - Cisco Nexus 7000 Series Configuration Manual

Components of Multicast Extranet

The Multicast Extranet VRF Select feature provides the capability for RPF lookups to be performed to the
same source address in different VRFs using the group address as the VRF selector. This feature enhances
extranet MVPNs by enabling service providers to distribute content streams coming in from different MVPNs
and redistributing them from there.
The Multicast VPN VRF Select feature is configured by creating group-based VRF selection policies.
Group-based VRF selection policies are configured using the ip multicast rpf select command. The ip multicast
rpf select command is used to configure RPF lookups originating in a receiver MVRF or in the global routing
table to be resolved in a source MVRF or in the global routing table based on group address. Access Control
Lists (ACLs) are used to define the groups to be applied to group-based VRF selection policies.
The figure illustrates an extranet MVPN topology with the Multicast VPN VRF Select feature configured. In
this topology, (S, G1) and (S, G2) PIM joins originating from VPN-Green, the receiver VRF, are forwarded
to PE1, the receiver PE. Based on the group-based VRF selection policies configured, PE1 sends the PIM
joins to VPN-Red and VPN-Blue for groups G1 and G2, respectively.
Figure 19: RPF Lookups Using Group-Based VRF Selection Policies
Components of Multicast Extranet
The figure below illustrates the components that constitute multicast extranet.
• MVRF --Multicast VPN routing and forwarding (VRF) instance. An MVRF is a multicast-enabled VRF.
• Source MVRF --An MVRF that can reach the source through a directly connected customer edge (CE)
• 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.
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding
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.
router.
Configuring Multicast Extranet