Multicast in a virtual privat network: the internet providers view

Aljaž Vajda (2009) Multicast in a virtual privat network: the internet providers view. EngD thesis.

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Abstract

In the last decade we have witnessed a dramatic increase in bandwidth, which led to expand of services and allow providers to begin to offer other services such as video-based contents or IPTV, which operates on multicast technology. Almost everybody know packet offers of Internet providers, such as the so-called TRIO packets (Internet, telephony, and television). These services are usually offered to majority of users, called a private or residential customers. The majority of earnings of the ISPs bring business customers, which have significantly higher requirements than residential customers. Big business systems coordinate their dispersed locations together, through a network of Internet service provider. For example, a large trading company based in Ljubljana have in almost every major place of their own offices, and those offices communicate with the central place of business, through virtual private network (VPN below). This VPN is running through ISP network on the provider's edge (PE) routers, which communicate with the customer's edge (CE) routers. Service provider provides connectivity as well as routing which is running by routing protocol such as MPLS and BGP. From the user's perspective, VPN is visible as a large local area network(LAN). On the Cisco platform this allows implementation of VRF, which represents the routing and forwarding table of a specific VPN. The customers desire and demand is that the provider should provide all necessary conditions and technologies for running their business. One of these technologies is multicast, which client wishes to send within locations in its VPN. For example, the need for video conferencing or to transfer data of critical business applications. All bigger stock exchanges run multicast through their VPNs. This service is called multicast VPN or mVPN. To allow for this type of service transfer, provider must make some changes on their PE routers, and add some parameters within a VRF. MVPN service is like any other VPN services, running through providers network, the routing and management is taking care by the provider. We will get to know why the implementation of mVPN on service provider network is adequate if we want to offer multicast VPN to the enterprises, which would run their multicast VPN over service provider backbone.

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