Older technologies like frame relay and TDM point-to-point connections are being replaced by MPLS networks. This shift from switched circuit to packet-switched networks reflects the declining significance of traditional telephone traffic in global voice, data, and video communication.

MPLS’s adaptability makes it the preferred WAN technology. The acronym’s MP stands for Multi-Protocol, signifying its ability to handle various traffic types. By attaching a label to each packet, MPLS ensures seamless transmission from origin to destination via Label Switching (LS).

Another burgeoning networking technology is VPLS (Virtual Private LAN Service). This Ethernet WAN service interconnects multiple company LANs, forming a unified, expansive LAN encompassing global sites.

You might think, “That’s it, I want VPLS, not MPLS.”

However, VPLS relies on MPLS networks for transport. It functions as a service operating on MPLS, leveraging the multi-protocol capabilities of MPLS networks.

Technically, VPLS employs “pseudo-wires,” which, as the name suggests, emulate a wired connection over a network. Unlike a dedicated physical wire leased for private line service, pseudo-wires establish private lines within packet-switched networks, creating a transparent connection for service delivery between two points.

Consider a pseudo-wire analogous to an Ethernet cable on your LAN—it doesn’t interfere with your protocol. Similarly, it ensures protocol transparency on the WAN. By establishing pseudo-wires across the MPLS network, virtual LAN connections spanning vast distances can be created, extending your LAN beyond physical boundaries.

The network also emulates a switch or bridge to establish a meshed network, enabling all locations to communicate seamlessly, as if on a bridged LAN. VPLS, being a multi-point service, is ideal for connecting multiple locations, while a simple point-to-point connection could be achieved with Ethernet Line Service over a pseudo-wire through the MPLS network.

Visualize the MPLS network as a data-transporting cloud, establishing a multipoint switched network to interconnect two or more business LANs, regardless of their geographic distribution. This cloud-like nature abstracts the complexities of packet routing, requiring only a connection to the cloud from your desired locations.

These “last mile” connections can utilize various protocols and bandwidths. VPLS service necessitates Ethernet connections in the last mile, whether over copper, fiber, or even DS1 or DS3 when EoC is unavailable.

Alternatively, if layer 2 connectivity between LANs isn’t required and only file transfer between locations is desired, a MPLS VPN service can be implemented. This service can leverage layer 3 routing, similar to private lines or the Internet. One advantage is the flexibility to utilize diverse connection types, such as T1 lines, DSL, and SONET fiber optic, accommodating different connection types at each location. The network efficiently encapsulates packets with MPLS labels for seamless delivery.

Consider evaluating your WAN connectivity for potential improvements in bandwidth, quality of service, or cost. Obtain competitive quotes for VPLS over MPLS and MPLS VPN network services to explore available options for your business locations.

Note: World map graphic courtesy of Wikimedia Commons.