MPLS


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MPLS

MPLS

(1) (MultiProtocol Lambda Switching) An earlier name for generalized multiprotocol label switching (see GMPLS).

(2) (MultiProtocol Label Switching) A standard from the IETF for directing packets in a wide area IP network. Operating below the IP layer and above the optical layer, MPLS is used to ensure that packets take the same route. It is deployed by telcos and ISPs to support service level agreements (SLAs) that guarantee bandwidth. Large enterprises may also use MPLS in national private networks.

Label Edge Routers and Label Switching Routers
Similar to Cisco's tag switching, an MPLS router attaches labels (tags) containing forwarding information to outgoing IP packets. These "label edge routers" (LERs) sit at the edge of the network and perform the complex packet analysis and classification before the packet enters the core of the network. The routers within the core, known as "label switching routers" (LSRs), quickly examine the label and forward the packet per its directions without having to look up data in tables and compute the forwarding path each time. The edge routers at the receiving end remove the labels. See VPLS, GMPLS and Diffserv.


An MPLS Core
Using IP and MPLS in the core, a service provider can offer its customers a virtual private VPN service for IP traffic with guaranteed bandwidth.
References in periodicals archive ?
One of the greatest advantages of MPLS VPNs is that no intelligence is required in the CPE devices, since all of the VPN functions are performed at the core, meaning that customers may now use much less expensive CPE devices.
Redback has also announced features to enhance its QoS implementation such as per class policing and MPLS QoS.
Cisco's MPLS enhancements have given us improved network efficiencies and added functionality for our IP VPN customers," says Charles Salameh, vice president of New Cisco Technologies Enable Managed Shared Services Over MPLS Page 3 Bell Managed Solutions, Bell Canada.