MPLS performs the following functions: - Specifies mechanisms to manage traffic flows of various granularities, such as flows between different hardware, machines, or even flows between different applications
- Remains independent of the Layer-2 and Layer-3 protocols
- Provides a means to map IP addresses to simple, fixed-length labels used by different packet-forwarding and packet-switching technologies
- Interfaces routing protocols such as resource reservation protocol (RSVP) and open shortest path first (OSPF)
- Supports the IP, ATM, and frame-relay Layer-2 protocols
Mainly, there are three flavours of MPLS based Virtual Private Networks (VPN): MPLS VPN Networks:Layer 3 VPNs:With L3 VPNs , Orion participates in the customer’s Layer 3 routing. The customer’s CE router at each of his sites speaks a routing protocol such as BGP or OSPF to the Orion’s underlying provider’s PE router, and the IP prefixes advertised at each customer site are carried across the provider network. L3 VPNs are attractive to customers who want to leverage Orion’s technical expertise to insure efficient site-to-site routing. 
Layer 2 VPNs:Orion interconnects the customer sites via the Layer 2 technology – usually ATM, Frame Relay, or Ethernet. The customer implements whatever Layer 3 protocol he wants to run, with no participation by Orion’s underlying network provider at that level. L2 VPNs are attractive to customers who want complete control of their own routing. 
Virtual Private LAN Service:VPLS makes the network look like a single Ethernet switch from the customer’s viewpoint. The attraction of VPLS to customers is that they can make their WAN look just like their local campus- or building-scope networks, using a single technology (Ethernet) that is cheap and well understood. Unlike traditional Metro Ethernet services built around actual Ethernet switches, Orion can connect VPLS customers from regional all the way up to global scales. So a customer with sites in London, Dubai, Bangalore, Hong Kong, Los Angeles, and New York can connect all his sites with what appears to be a single Ethernet switch. 
Business Benefits of MPLS VPN Network:- MPLS benefits include better performance, lower total cost of ownership, greater flexibility to accommodate new technologies, better security and survivability.
| - Consolidate your network to a single, enterprise-wide view of your sites/group of companies.
| - Better performance: Uses Classes of Service (CoS/QoS) and priority queuing so your network knows which traffic is most important and ensures that it takes priority over other traffic.
| - Have the option to deliver firewalled internet access from the cloud to specified facilities to eliminate internet local loop costs.
| - Depending on your current enterprise class network, you can reduce your on-going WAN operating costs by up to 50%, while maintaining a high level of reliability and service.
| - Reduce the time and cost involved in managing a technologically disparate “system of systems”.
| - “Future-proof” the architecture of your network so it can respond rapidly to changing business needs (e.g. New services, latency sensitive traffic, bandwidth intensive traffic, VoIP, video).
| - Online reporting allows you to truly see what is happening on your network so you subscribe only to the bandwidth that you really need.
| - Lower packet loss means faster response for applications and Network survivability from its fully meshed nature.
| - Simplify the administration and on-going management of your network
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For more information regarding these and other Orion services, please contact us today. 1-800-398-5770 or
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