Cisco XR 12000 Series Configuration Manual page 24

Information About Implementing Multicast Routing
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:
•
•
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:
•
•
MVPN extranet routing provides support for IPv4 over IPv4 address family solely on the
Cisco XR 12000 Series Router platform.
An extranet network requires the PE routers to pass traffic across VRFs (labeled "P" in
Extranet networks can run either IPv4 or IPv6 (Cisco IOS XR software currently supports only IPv4),
but the core network always runs only IPv4 native multicast.
Extranet Components
Figure 6
Figure 6
Source
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 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.
Multicast Configuration Guide
MCC-16
Maintain multicast topology maps across VRFs.
Maintain multicast distribution trees to forward traffic across VRFs.
Inefficient content distribution between enterprises.
Inefficient content distribution from service providers or content providers to their enterprise VPN
customers.
illustrates the components comprising an extranet MVPN.
Components of an Extranet MVPN
MVRF for VPN-A
Source MVRF
PE1 => Source PE
CE
VPN-
A
Implementing Multicast Routing on Cisco IOS XR Software Cisco ASR 9000 Series Routers
PE1 P
MVRF for VPN-B
Source MVRF
PE1 => Source PE
VPN-B
CE
PE2
PE3
CE
VPN-
MVRF for VPN-A
Figure 6).
Receiver
Receiver
A
OL-