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Label Switching
  Multi-protocol Label Switching (MPLS) is a technology that can address ever-increasing network requirements.

The benefits of MPLS include improved network scalability, quality of service (QoS) and traffic engineering. MPLS QoS supports sensitive data such as video by incorporating mechanisms that can provide such traffic with preferential treatment .MPLS traffic engineering allows manipulation of data flow across networks, so that new services can be offered. Additionally, unlike other technologies, MPLS wont consume your budge because many existing routers and WAN switches support the standard.

MPLS presents a simple way to forward information through networks by installing and then examining short, fixed-length ID markings called labels in packets. By relying on labels to forward information, MPLS usually doesn't use a packets IP header unless it is entering or leaving MPLS. Because labels reduce dependency on IP data, new and larger network designs become possible.

MPLS-enabled devices Ccalled MPLS nodes or Label Switch Routers (LSR)-process labels at Layer2. Therefore, slower network devices may work more quickly when enabled for MPLS. In some scenarios, the MPLS label can be directly integrated with other Layer 2 protocol headers. Because MPLS nodes can find integrated labels more rapidly than IP data or regular MPLS labels, network performance may be further improved.

As a packet arrives on an MPLS node, its label-provided there is one-is compared to an onboard database called the label information base (LIB). The LIB contains a table that is used to add a label, while determining the outgoing interface to which the data will be sent. After consulting the LIB, the MPLS node forwards the packet towards its destination. The LIB can simplify forwarding and increase scalability by tying many incoming labels to the same outgoing label information, providing a new type of integrated summary routing.

When a set of MPLS nodes have information in their LIBs related to the same destination, a label switched path (LSP) has been created .LSPs may be built automatically by the label distribution protocol (LDP) or other protocols.

QoS and traffic engineering components round out MPLSs core features. As part of LDP, forwarding equivalence classes specify selected data that should use a particular LSP.MPLS nodes can then provide basic QoS to that LSP and the chose data within. Providing a basic for traffic engineering, explicitly routed LSPs are LSPs whose route through anMPLS network has been granted a priority, avoiding the automatic setup described earlier. Explicitly routed LSPs allow traffic to be engineered to travel through the net and avoid congested areas, according to QoS requirement, security need or other criteria.

Considering the increasing expectations being placed on networks, the benefits provided by MPLS make it a promising technology. MPLS can enhance network scalability and performance while providing advanced services in a simple package. If youre upgrading an existing network or planning a next--generation network, MPLS is a concept bear in mind

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