Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS) Traffic Engineering (TE)

Rekhter, Yakov; Kompella, Kireeti

doi:10.17487/rfc4206

Cited by 75 publications

(123 citation statements)

References 12 publications

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“…-Hierarchical LSPs. Signalling must support LSP nesting even with unnumbered links in order to improve the scalability of GMPLS (Kompella 2005). An LSP may be advertised as a TE link for use within the same instance of the control plane as was used to set up the LSP.…”

Section: Distributed Control Of Optical Network:gmplsmentioning

confidence: 99%

Signal Processing, Management and Monitoring in Transmission Networks

Vázquez

Montalvo

Ahmed

et al. 2011

Optical Transmission

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1higher, linear and non-linear fibre impairments become prominent factors affecting the signal quality. Thus, new techniques in both physical layer and network layer are necessary for mitigating impairments to accommodate high-speed traffic (Tomkos et al. 2002). On the other hand, the flexibility of modern networks with dynamic and distributed management, where lightpaths can be dynamically and automatically assigned end-to-end, increases the risk of changing path conditions that affect signal quality and consequently quality of service (QoS) over the lifetime of a connection as well as for subsequent connection set-up requests (on-demand routing and wavelength assignment -RWA). For traditional connection provisioning an ideal physical layer, ignoring transmission impairments (Chlamtac et al. 1992) could be assumed because the implicit per hop regeneration (optics-to-electronics-to-optics conversion -O/E/O) compensated signal impairments hop-by-hop in a rather static manner (section commissioning). For end-to-end all-optically switched connections using photonic cross-connect switches (PXC), the conditions change and common practice is not applicable. Anyhow, intelligent connection provisioning is an important traffic engineering problem, and minimising operational cost as well as efficiently utilising network resources is the main driver. In this context, it seems important to have flexible routing protocols that take into consideration the most relevant physical impairments, and are able to exchange messages with their values as part of the route information with others. This condition, if definitely used to calculate routing, will surely assure better success in data delivery over the network (Huang et al. 2005). Irrespective of the control architecture chosen by an operator of an optical network, the included control plane (in charge of setting up and tearing down optical circuits; also known as lightpaths) needs to have a proper set of tools to satisfyingly deal with physical impairments. The most essential tools are: optical signal monitoring, signal processing and impairment compensation techniques (each all-optically and/or electrically). With the help of these tools, it is possible to predict the QoT (quality of transmission) attainable for a lightpath at a given time (i.e. the latest network-wide monitoring instant), and the control plane can route requests across the network

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Section: Distributed Control Of Optical Network:gmplsmentioning

confidence: 99%

Signal Processing, Management and Monitoring in Transmission Networks

Vázquez

Montalvo

Ahmed

et al. 2011

Optical Transmission

View full text Add to dashboard Cite

show abstract

“…In addition, the reader is assumed to be familiar with [RFC3945], [RFC3471], [RFC4201], [RFC4202], [RFC4203], [RFC4206], and [RFC5307].…”

Section: Conventions Used In This Documentmentioning

confidence: 99%

“…Section 6.2 of [RFC4206] specifies that when a region boundary node receives a Path message, the node determines whether or not it is at the edge of an LSP region with respect to the Explicit Route Object (ERO) carried in the message. If the node is at the edge of a region, it must then determine the other edge of the region with respect to the Explicit Route Object (ERO), using the IGP database.…”

Section: Multi-region Signalingmentioning

confidence: 99%

“…Applying the procedure of [RFC4206] in an MRN environment MAY lead to the setup of single-hop FA-LSPs between each pair of nodes. Therefore, considering that the path computation is able to take into account richness of information with regard to the SC available on given nodes belonging to the path, it is consistent to provide enough signaling information to indicate the SC to be used and over which link.…”

Section: Multi-region Signalingmentioning

confidence: 99%

“…describes the ability of a node to forward data of a particular data plane technology, and uniquely identifies a control plane LSP region. LSP regions are defined in [RFC4206]. A network comprised of multiple switching types (e.g., PSC and TDM) controlled by a single GMPLS control plane instance is called a Multi-Region Network (MRN).…”

Section: Introductionmentioning

confidence: 99%

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