From Next Generation SONET/SDH
3.14 MPLS, MPλS, AND GMPLS
The generic multiprotocol label switching (GMPLS) protocol is a generalization of
a previously defined IETF multiprotocol wavelength switching (MPλS) in order to
support very high bit rates and lightpath connectivity in optical and, particularly,
WDM networks. MPλS was an extension of the initially defined multiprotocol label
switching (MPLS) protocol to include features needed for optical networking.
According to MPLS, one or more labels are attached to IP packets when they enter
a label edge router (LER) of a MPLS network domain. Labels indicate the next
router destination in the MPLS network* (Figure 3.24).
The basic principle is that the control plane, which deals with routing, is decoupled
from the switching, which deals with packet forwarding. Thus, when a label-
*Labels have been calculated according to a search algorithm and signaling messages that identify and
establish the best path throughout the MPLS network; the path from source to destination is known as a
switched router (LSR) receives an MPLS packet, it forwards it to one of its outputs,
which is selected according to the label value in the packet and the port it was received.†
Thus, the LSR function in the router may swap...
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Introduction Multiprotocol Label Switching is designed to forward packets through a network with extremely high performance by adding a label to packets as they enter the network at edge routers.
This chapter introduces GMPLS signaling. It explains the role of signaling within a GMPLS network and defines the signaling protocol that is used to exchange messages within the control plane in order...
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