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 ?
(2013), a TIR esta diretamente relacionada ao VPL, pois, com a TIR, existe a busca por uma unica taxa de retorno que compreenda os meritos de um projeto.
Additionally, as we are going to show only mean VPLs in all the following plots, Figure 11 relates this to minimum, maximum, and 95th percentile VPL values.
There are several known high pressure two-phase phenomena including CIS, VPLS, CIWH, BLEVE, BLCBE that can develop in HVAC&R systems if appropriate design and maintenance procedures are not in place.
No caso das plantas com flexibilidade de input (com input FLEX), onde se pode-se utilizar GN ou OP como materia-prima do processo, os VPLs sao positivos, exceto para a planta que segue a rota A que tem VPL negativo para ambos os processos estocasticos.
Moreover, factor analysis for main variables by use of VPLS software indicates that with 89% approximation, changes of human resources empowerment (dependent variable) with KM (independent variable) are accurately explained.
This is an opportunity for a networking person to learn more about virtualisation, newer technologies such as VPLS and MPLS and how you can get a tighter working relationship with the server and the application.
Specifically, GBI can provide capacity to Tinet in countries and cities in which the GBI Cable System lands; meanwhile Tinet can provide Global IP Transit, Ethernet and VPLS connectivity services in all of its PoPs to GBI.
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Bobbies have been banned from wearing revealing underwear over fears members of the public will be exposed to their VPLs as they walk the beat.
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The data center version supports a forwarding information base that's half the size of the service provider version and does not include MPLS or VPLS.