In particular, GMPLS will provide support for photonic networking, also known as optical communications. You forgot to provide an Email Address. This email address is already registered. Please login.
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It was originally developed in the late s to provide faster packet forwarding for IP routers see RFC Since then its capabilities have expanded massively, for example to support service creation VPNs , traffic engineering, network convergence, and increased resiliency.
MPLS is now the de-facto standard for many carrier and service provider networks and its deployment scenarios continue to grow. Traditional IP networks are connectionless: when a packet is received, the router determines the next hop using the destination IP address on the packet alongside information from its own forwarding table.
The label is an inherent part of the switch fabric and the switching operations depend on wavelength, or timeslot etc. This permits the benefits of MPLS to be shared by many different types of switching platform. When a packet is received, the router uses this label and sometimes also the link over which it was received to identify the LSP.
It then looks up the LSP in its own forwarding table to determine the best link over which to forward the packet, and the label to use on this next hop.
A different label is used for each hop, and it is chosen by the router or switch performing the forwarding operation. This allows the use of very fast and simple forwarding engines, which are often implemented in hardware. Ingress routers at the edge of the MPLS network classify each packet potentially using a range of attributes, not just the packet's destination address, to determine which LSP to use.
The above is only one use of MPLS. It can be used to carry any content not only packets over any link technology using different label encoding for each layer 2 link type. The most commonly used schemes are. Using the TDM and WDM examples above, the LSP traffic is switched based on a continuous, constant property of the data stream — the data stream is not switched one packet at a time. This allows for a very efficient implementation in the data plane with zero per-packet lookups, making GMPLS a highly suitable protocol to run in high bandwidth networks.
At each LSR, the implicit label on received data determines the outgoing interface and the implicit label with which to transmit onwards data. Two separate protocols are needed to perform this task: a routing protocol and a signaling protocol.
These are described below. Static provisioning has not been very widely deployed to date, but it can have a role in the access network. The routing protocol distributes network topology information through the network so that the route of an LSP can be calculated automatically. However, these routing protocols only distribute network topology. When traffic engineering is required to establish LSPs with guaranteed QoS characteristics and backup LSPs that avoid any single point of failure, the traffic engineering TE extensions to these protocols are used.
Various mechanisms to extend this traffic engineering to inter-area and inter-carrier routing have been proposed, but none is yet universally accepted. The signaling protocol informs the switches along the route which labels and links to use for each LSP.
This information is used to program the switching fabric. For MPLS, one of three main signaling protocols is used, depending on the application. Skip to Content. Blog Support Search Search:. Menu Close. Learn more: view the specification of our MPLS protocol stack. Contact us to buy our MPLS protocol stack.
ASON GMPLS Optical Control Plane Tutorial
Generalized Multi-Protocol Label Switching GMPLS  is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies other than packet interfaces and switching, such as time-division multiplexing , layer-2 switching, wavelength switching and fiber-switching. These changes and additions impact basic label-switched path LSP properties: how labels are requested and communicated, the unidirectional nature of LSPs, how errors are propagated, and information provided for synchronizing the ingress and egress LSRs. The Generalized Label is a label that can represent either a a single fiber in a bundle, b a single waveband within fiber, c a single wavelength within a waveband or fiber , or d a set of time-slots within a wavelength or fiber. From Wikipedia, the free encyclopedia. Journal of Optical Communications and Networking.
Generalized Multi-Protocol Label Switching
It was originally developed in the late s to provide faster packet forwarding for IP routers see RFC Since then its capabilities have expanded massively, for example to support service creation VPNs , traffic engineering, network convergence, and increased resiliency. MPLS is now the de-facto standard for many carrier and service provider networks and its deployment scenarios continue to grow. Traditional IP networks are connectionless: when a packet is received, the router determines the next hop using the destination IP address on the packet alongside information from its own forwarding table.