•
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
customers.
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 Figure 6: Components
of an Extranet MVPN, on page 21). Extranet networks can run either IPv4 or IPv6, but the core network
always runs only IPv4 active multicast.
Multicast extranet routing is not supported on BVI interfaces.Note
Extranet Components
Figure 6: Components of an Extranet MVPN
MVRF—Multicast VPN routing and forwarding (VRF) instance. An MVRF is a multicast-enabled VRF. A
VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.1.x
21
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
Multicast VPN Extranet Routing
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