Configuring Multicast Extranet; Information About Configuring Multicast Extranet - Cisco Nexus 7000 Series Configuration Manual

Configuring Multicast Extranet

This chapter describes how to configure the Multicast Extranet feature on Cisco Nexus 7000 Series Switches.
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Information About Configuring Multicast Extranet

An extranet can be viewed as part of a company's intranet that is extended to users outside the company. It
has also been described as a "state of mind" in which a VPN is used as a way to do business with other
companies as well as to sell products and content to customers and companies. An extranet is a VPN connecting
the corporate site or sites to external business partners or suppliers to securely share part of a business's
information or operations among them.
The Multicast VPN Extranet Support feature enables service providers to distribute IP multicast content
originated from one enterprise site to other enterprise sites. This feature enables service providers to offer the
next generation of flexible extranet services, helping to enable business partnerships between different enterprise
VPN customers. Using this feature, service providers can offer multicast extranet contracts to meet various
business partnership requirements, including short-term, annual, and rolling contracts.
Earlier to Release 8.2(1), Cisco NX-OS multicast implementation, multicast traffic can flow only within the
same virtual routing and forwarding (VRF). However, with the introduction of the Multicast Extranet feature,
multicast receivers can exist in different VRFs from source in an enterprise network.
With multicast extranet, the reverse path forwarding (RPF) lookup for multicast route in the receiver VRF
can be carried out in the source VRF, thereby allowing to return a valid RPF interface. This forms a source
or RP tree from the receiver VRF to the source VRF, thus enabling the traffic that originated from the source
VRF to be forwarded to the outgoing interface (OIF) in the receiver VRF.
The Multicast VPN Extranet Support feature can be used to solve such business problems as:
• Efficient content distribution between enterprises
• Efficient content distribution from service providers or content providers to their different enterprise
Prior to the introduction of the Multicast VPN Extranet VRF Select feature, RPF lookups for a source address
could be performed only in a single VRF, that is, in the VRF where Internet Group Management Protocol
(IGMP) or PIM joins are received, in the VRF learned from BGP imported routes, or in the VRF specified in
static mroutes (when RPF for an extranet MVPN is configured using static mroutes). In those cases, the source
VRF is solely determined by the source address or the way the source address was learned.
Information About Configuring Multicast Extranet, on page 173
VPN customers
C H A P T E R
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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