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Business Internet IP Virtual Private Networks

44 Montgomery, San Francisco has enjoyed dedicated BuildiNet™ since February, 2000.

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MultiProtocol Label Switching is the fastest growing telecommunication service of the last few years. MPLS allows offices to replace their existing Frame Relay with faster and more reliable services. This means no more Committed Information Rates (CIRs).  With MPLS, companies can connect multiple networks and locations together globally with as much as 10 class layers of service for voice, video and data.

MultiProtocol Label Switching (MPLS) is a high performance secure process in telecommunication networks that directs data from one network node to another based on short path "Labels," instead of using long network addresses.  This avoids complex queries in the routing tables, at each hop. MPLS securely encapsulates packets of various network protocols, while supporting a range of routing technologies, including Frame Relay DSL, ATM, T1, E1. The most widely deployed usage of MPLS is for enabling and optimizing Virtual Private Networks (VPNs). As a Wide Area Network technology for communicating data between multiple points, MPLS allows you to run secure applications over a single Virtual Private Network. MPLS is protocol agnostic, highly scalable and flexible, while prioritizing both delivery and applications. MPLS integrates Layer 2 (L2) switching and Layer 3 (L3) routing, and enables network-edge-routers to apply simple MPLS labels to packets and frames.

In Traditional IP networks:

  • Every router performs IP searches, called "routing," determining the next hop, according to its routing-table. The router then forwards the packet to that next hop in the sequence.
  • At every stop, the new router will clear and repeat, each time making their own independent routing choices. This will go on until the packet gets to the final destination.

MPLS Instead Performs "Label Switching":

  • The initial router performs a routing search
  • Instead of seeking the next hop, the router searches and finds the router at the final destination
  • Then the same initial router finds a predetermined path from starting point to the final destination router
  • The router then applies a "Label,"  also known as a shim, based on all this path data collected
  • Then, all other routers on the path use this label to direct the traffic without having to perform additional IP searches
  • At the final destination, the label is removed from the router and the packet is delivered via normal IP routing.

Consequently, in an MPLS network, data packets are assigned labels. Forwarding of packet decisions are then made exclusively on the contents of its specified label at each hop, instead of the routers having to examine the contents of the packet itself, each time.

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