Link Management Protocol (LMP) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems
RFC 4209
Document | Type |
RFC - Proposed Standard
(October 2005; No errata)
Updated by RFC 6898
|
|
---|---|---|---|
Authors | Andre Fredette , Jonathan Lang | ||
Last updated | 2013-03-02 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4209 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Bert Wijnen | ||
Send notices to | <adrian@olddog.co.uk>, <kireeti@juniper.net> |
Network Working Group A. Fredette, Ed. Request for Comments: 4209 Hatteras Networks Category: Standards Track J. Lang, Ed. Sonos Inc. October 2005 Link Management Protocol (LMP) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2005). Abstract The Link Management Protocol (LMP) is defined to manage traffic engineering (TE) links. In its present form, LMP focuses on peer nodes, i.e., nodes that peer in signaling and/or routing. This document proposes extensions to LMP to allow it to be used between a peer node and an adjacent optical line system (OLS). These extensions are intended to satisfy the "Optical Link Interface Requirements" described in a companion document. 1. Introduction Networks are being developed with routers, switches, optical cross- connects (OXCs), dense wavelength division multiplexing (DWDM) optical line systems (OLSes), and add-drop multiplexors (ADMs) that use a common control plane (e.g., Generalized MPLS (GMPLS)) to dynamically provision resources and to provide network survivability using protection and restoration techniques. The Link Management Protocol (LMP) is being developed as part of the GMPLS protocol suite to manage traffic engineering (TE) links [RFC4204]. In its present form, LMP focuses on peer nodes, i.e., nodes that peer in signaling and/or routing (e.g., OXC-to-OXC, as illustrated in Figure 1). In this document, extensions to LMP are proposed to allow it to be used between a peer node and an adjacent optical line system (OLS). These extensions are intended to satisfy Fredette & Lang Standards Track [Page 1] RFC 4209 LMP for DWDM Optical Line Systems October 2005 the "Optical Link Interface Requirements" described in [OLI]. It is assumed that the reader is familiar with LMP, as defined in [RFC4204]. +------+ +------+ +------+ +------+ | | ----- | | | | ----- | | | OXC1 | ----- | OLS1 | ===== | OLS2 | ----- | OXC2 | | | ----- | | | | ----- | | +------+ +------+ +------+ +------+ ^ ^ | | +---------------------LMP---------------------+ Figure 1: LMP Model Consider two peer nodes (e.g., two OXCs) interconnected by a wavelength-multiplexed link, i.e., a DWDM optical link (see Figure 1 above). Information about the configuration of this link and its current state is known by the two OLSes (OLS1 and OLS2). Allowing them to communicate this information to the corresponding peer nodes (OXC1 and OXC2) via LMP can improve network usability by reducing required manual configuration and by enhancing fault detection and recovery. Information about the state of LSPs using the DWDM optical link is known by the peer nodes (OXC1 and OXC2), and allowing them to communicate this information to the corresponding OLSes (OLS1 and OLS2) is useful for alarm management and link monitoring. Alarm management is important because the administrative state of an LSP, known to the peer nodes (e.g., via the Admin Status object of GMPLS signaling [RFC3471]), can be used to suppress spurious alarm reporting from the OLSes. The model for extending LMP to OLSes is shown in Figure 2. +------+ +------+ +------+ +------+ | | ----- | | | | ----- | | | OXC1 | ----- | OLS1 | ===== | OLS2 | ----- | OXC2 | | | ----- | | | | ----- | | +------+ +------+ +------+ +------+ ^ ^ ^ ^ ^ ^ | | | | | | | +-----LMP-----+ +-----LMP-----+ | | | +----------------------LMP-----------------------+ Figure 2: Extended LMP Model Fredette & Lang Standards Track [Page 2] RFC 4209 LMP for DWDM Optical Line Systems October 2005Show full document text