Internet Engineering Task Force (IETF) T. Otani, Ed.
Request for Comments: 6205 KDDI
Updates: 3471 D. Li, Ed.
Category: Standards Track Huawei
ISSN: 2070-1721 March 2011
Generalized Labels for Lambda-Switch-Capable (LSC)
Label Switching Routers
Technology in the optical domain is constantly evolving, and, as a
consequence, new equipment providing lambda switching capability has
been developed and is currently being deployed.
Generalized MPLS (GMPLS) is a family of protocols that can be used to
operate networks built from a range of technologies including
wavelength (or lambda) switching. For this purpose, GMPLS defined a
wavelength label as only having significance between two neighbors.
Global wavelength semantics are not considered.
In order to facilitate interoperability in a network composed of next
generation lambda-switch-capable equipment, this document defines a
standard lambda label format that is compliant with the Dense
Wavelength Division Multiplexing (DWDM) and Coarse Wavelength
Division Multiplexing (CWDM) grids defined by the International
Telecommunication Union Telecommunication Standardization Sector.
The label format defined in this document can be used in GMPLS
signaling and routing protocols.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
Otani & Li Standards Track [Page 1]RFC 6205 Generalized Labels for LSC LSRs March 2011Copyright Notice
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As described in [RFC3945], GMPLS extends MPLS from supporting only
Packet Switching Capable (PSC) interfaces and switching to also
supporting four new classes of interfaces and switching:
o Layer-2 Switch Capable (L2SC)
o Time-Division Multiplex (TDM) Capable
o Lambda Switch Capable (LSC)
o Fiber Switch Capable (FSC)
A functional description of the extensions to MPLS signaling needed
to support new classes of interfaces and switching is provided in
This document presents details that are specific to the use of GMPLS
with LSC equipment. Technologies such as Reconfigurable Optical
Add/Drop Multiplex (ROADM) and Wavelength Cross-Connect (WXC) operate
Otani & Li Standards Track [Page 2]RFC 6205 Generalized Labels for LSC LSRs March 2011
at the wavelength switching level. [RFC3471] states that wavelength
labels "only have significance between two neighbors" (Section
18.104.22.168); global wavelength semantics are not considered. In order
to facilitate interoperability in a network composed of LSC