VPLS


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Related to VPLS: Mpls

VPLS

(Virtual Private LAN Service) A multipoint virtual private network (VPN) service from carriers that connects any number of Ethernet LANs together over an IP core, typically using MPLS, although other encapsulation protocols can be used. Known as a "transparent LAN service" (TLS), from a customer's viewpoint, all connections appear as one Ethernet network, and all protocols in the customer's network (IP, IPX, etc.) are automatically supported.

Prior to VPLS, attempts at transparent LAN services had been problematic. Ethernet is a broadcasting technology, while carrier networks are point-to-point. VPLS was designed to resolve this dichotomy and provide ease of scalability for the service provider.

The Provider Creates the Mesh
Connecting two LANs together can be easily done using a private line or frame relay, however, three or more LANs requires provisioning private lines or frame relay virtual circuits between each site. For example, in a frame relay VPN, four sites would need 12 unidirectional circuits. With VPLS, the customer leases one circuit for each site, and the service provider's network creates the mesh of connections over IP.

LANs Connect to Edge Routers
Each LAN connects to a VPLS edge router that looks up the destination Ethernet address (MAC address) and adds a virtual channel label to the packet. The edge routers provide a special form of packet replication in order to support Ethernet's broadcasting architecture. Packets are directed through the Internet via MPLS label switch routers (LSRs) to the edge router at the other end. Service providers can serve multiple customers from a single location by multiplexing several streams of data from that location to the same edge router. See virtual private network and MPLS.


Frame Relay VPN Vs. VPLS Services
Frame relay services have to be provisioned with virtual circuits for each site-to-site connection. VPLS customers lease connections from each location to the carrier, and the MPLS fabric handles the routing. (Illustration drawn with assistance courtesy of Alcatel, www.alcatel.com)



Frame Relay VPN Vs. VPLS Services
Frame relay services have to be provisioned with virtual circuits for each site-to-site connection. VPLS customers lease connections from each location to the carrier, and the MPLS fabric handles the routing. (Illustration drawn with assistance courtesy of Alcatel, www.alcatel.com)
References in periodicals archive ?
Alcatel-Lucent VPLS solution enables service providers to offer enterprise customers the operational cost benefits of Ethernet with the predictable QoS characteristics of MPLS.
The successful Ethernet OAM functionality was verified across maintenance domains including the customer layer 2 domains and across the provider-provisioned LDP signaled VPLS bridge domain.
Reliance Globalcom was one of the first carriers to offer a global VPLS service and strong service level guarantees, which helped put them at the forefront of the managed Ethernet services market," said Michael Howard, principal analyst at Infonetics Research.
The standard VPLS solutions available do not enable carriers to guarantee SLAs or Quality of Service (QoS), according to Atrica.
extensive discussion of multicast support over MPLS, including a new chapter dedicated to multicast in VPNs, explaining both the PIM/GRE (Protocol Independent Multicast / Generic Routing Encapsulation) and the next generation BGP/MPLS solutions, new material on support of multicast in VPLS, a much-expanded chapter on MPLS multicast and a section perations and management (OAM) tools for point-to-multipoint LSPs.
A spokesperson for Comstar said that Riverstone was chosen because its VPLS solution allows Comstar to gain additional revenues by offering a new Ethernet service with more flexible bandwidth capabilities and more sophisticated service level agreements.
MX960 Ethernet Services Router Demonstrates LDP Signaling for VPLS and Interoperability of Metro Ethernet Forum Specifications
Carrier Class CLE Supports Both Carrier Ethernet and VPLS
Global Ethernet VPLS Network Enables Large Law Firm to Support VoIP, Video and Data Convergence across 26 Sites
The combination of CoS, Yipes' global Ethernet VPLS, the industry's strongest SLAs, and the ability to provision service over both copper and fiber, means customers can enjoy high-quality service throughout the Yipes network -- and with a lower total cost of ownership than other network technologies.
Juniper is also announcing enhancements to BGP (Border Gateway Protocol)-based VPLS (Virtual Private LAN Services), a technology pioneered in the industry by Juniper.