Generalized Multi-Protocol Label Switching: Difference between revisions

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The '''Generalized Multi-Protocol Label Switching''' ('''GMPLS)''')<ref>E. Mannie, "Generalized Multi-Protocol Label Switching (GMPLS) architecture", RFC 3945, Oct. 2004, IETF.</ref> 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.

extending [[MPLS]] to manage further classes of interfaces and switching technologies

other than packet interfaces and switching, i.e., time division multiplex, layer-2

switch, wavelength switch and fiber-switch. GMPLS is composed of three main

protocols:

* Resource Reservation Protocol with Traffic Engineering extensions ([[RSVP-TE]]) signaling protocol.<ref>D. Awduche, L. Berger, D. Gan, T. Li, V. Srinivasan, and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP tunnels", RFC 3209, Dic. 2001, IETF.</ref><ref>L. Berger, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, Jan. 2003, IETF.</ref>

* Open Shortest Path First with Traffic Engineering extensions ([[OSPF-TE]]) routing protocol.<ref>D. Katz, K. Kompella, and D. Yeung, "Traffic Engineering (TE) Extensions to OSPF Version 2 Architecture", RFC 3630, Sep. 2003, IETF.</ref><ref>K. Kompella and Y. Rekhter, "OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4203, Oct. 2005, IETF.</ref>

* Link Management Protocol ([[LMP]]).<ref>J. Lang, "Link Management Protocol (LMP)", RFC 4204, Oct. 2005, IETF.</ref>

==Differences between MPLS and GMPLS==

Generalized MPLS differs from traditional MPLS<ref>GMPLS RFC 3945 "1.2. Multiple Types of Switching and Forwarding Hierarchies"</ref> in that it extends support to multiple types of switching such as TDM, wavelength and fiber (port) switching. For instance, GMPLS is the ''[[de facto]]'' control plane of [[wavelength switched optical network]] (WSON).<ref>{{cite journal | last1 = Bernstein | first1 = G. M. | last2 = Lee | first2 = Y. | last3 = Galver | first3 = A. | last4 = Martensson | first4 = J. | year = 2009 | title = Modeling WDM wavelength switching systems for use in GMPLS and automated path computation | journal = [[Journal of Optical Communications and Networking]]| volume = 1 | issue = 1| pages = 187–195 | doi = 10.1364/JOCN.1.000187 | s2cid = 18648649 }}</ref> The support for the additional types of switching has driven GMPLS to extend certain base functions of traditional MPLS and, in some cases, to add functionality.

GMPLS differs from MPLS as it supports multiple types of switching. In particular, GMPLS offers the additional support for [[TDM]], wavelength, and fiber switching''<ref>L. Berger, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description", RFC 3471, Jan. 2003, IETF.</ref>

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.

==How GMPLS works==

GMPLS is based on Generalized Labels. 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). The Generalized Label can also carry a label that represents a generic MPLS label, a Frame Relay label, or an ATM label.

GMPLS is composed of three main protocols:

* Resource Reservation Protocol with Traffic Engineering extensions ([[RSVP-TE]]) signaling protocol.<ref>D. Awduche, L. Berger, D. Gan, T. Li, V. Srinivasan, and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP tunnels", RFC 3209, Dic. 2001, IETF.</ref><ref>L. Berger, "Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Extensions", RFC 3473, Jan. 2003, IETF.</ref>

* Open Shortest Path First with Traffic Engineering extensions ([[OSPF-TE]]) routing protocol.<ref>D. Katz, K. Kompella, and D. Yeung, "Traffic Engineering (TE) Extensions to OSPF Version 2 Architecture", RFC 3630, Sep. 2003, IETF.</ref><ref>K. Kompella and Y. Rekhter, "OSPF Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)", RFC 4203, Oct. 2005, IETF.</ref>

* Link Management Protocol ([[LMP]]).<ref>J. Lang, "Link Management Protocol (LMP)", RFC 4204, Oct. 2005, IETF.</ref>

==See also==

* [[Wavelength switched optical network]] (WSON)

* [[Automatic switched-transport network]] (ASTN)

==References==

{{Reflist}}

==BooksFurther reading==

* Adrian Farrel, Igor Bryskin, "GMPLS: architecture and applications", {{ISBN: |978-0-12-088422-3}}

== External links ==

* IETF CCAMP Working Group: [http://datatracker.ietf.org/wg/ccamp/charter/ ccamp charter].

* IETF TEAS Working Group: [http://datatracker.ietf.org/wg/teas/charter/ charter].

[[Category:Internet standardsStandards]]

[[Category:Network protocols]]

[[Category:Telecommunication protocols]]

{{network-stub}}