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Generalized Multi-Protocol Label Switching = GMPLS


The concepts were actually generalized, and therefore the work was named Generalized MPLS. .
             In an attempt of generalizing the concept, some of the MPLS techniques were targeted on establishing LSPs that matched the IP routing tables; these functions (such as that provided by the LDP signal protocol) are not applicable to non-packet transport networks. Transport networks are more focused on providing end-to-end connections to circuits. The MPLS protocols on which GMPLS is constructed were designed and implemented to apply traffic engineering to MPLS networks. .
             Traffic engineering is the method of managing the traffic over the computed traffic links within the network in order to optimize all the available resources. In practice, this implies routing traffic away from congested links selecting links that give the desired quality of service or satisfy different application constraints, or routing traffic in order to use underutilized links in the network. However, these are all packet-based concepts, which most of the times don't hold good for GMPLS. So, there are many adoptions and up-gradation of concepts of network services in GMPLS which we will be discussing in this article.
             ROUTING ISSUES AND THEIR SOLUTION BY GMPLS.
             In this section, we discuss the enhancements made in support of GMPLS. These enhancements are the solutions to some of the challenges of using MPLS to control optical and SONET/SDH time-division multiplexing (TDM) networks. These include:.
             1) The MPLS label space is huge (one million per port), as compared to the limited number of lambdas and TDM .
             channels (tens to hundreds per port today).
             2) MPLS LSPs can be allocated bandwidth from a continuous spectrum, whereas optical/TDM bandwidth allocation is.
             from a small discrete set of values.
             3) At present, there are hardly more than 10 parallel links between a pair of nodes. To handle the growth of traffic, service .
             providers will need to deploy hundreds of parallel fibers, each carrying hundreds of lambdas between a pair of network elements.


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