MPLS

What is MPLS?

 

MPLS allows most packets to be forwarded at Layer 2 (the switching level) rather than having to be passed up to Layer 3 (the routing level). Each packet gets labeled on entry into the service provider's network by the ingress router. All the subsequent routing switches perform packet forwarding based only on those labels—they never look as far as the IP header. Finally, the egress router removes the label(s) and forwards the original IP packet toward its final destination.

 

The label determines which pre-determined path the packet will follow. The paths, which are called label-switched paths (LSPs), allow service providers to decide ahead of time what will be the best way for certain types of traffic to flow within a private or public network.

 

How does MPLS works?

 

Service providers can use MPLS to improve quality of service (QoS) by defining LSPs that can meet specific service level agreements (SLAs) on traffic latency, jitter, packet loss and downtime. For example, a network might have three service levels -- one level for voice, one level for time-sensitive traffic and one level for “best effort” traffic. MPLS also supports traffic separation and the creation of virtual private networks (VPNs) virtual private LAN services (VPLS) and virtual leased lines (VLLs).

 

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