--- 1/draft-ietf-pce-wson-rwa-ext-04.txt 2016-08-15 11:16:28.227343831 -0700 +++ 2/draft-ietf-pce-wson-rwa-ext-05.txt 2016-08-15 11:16:28.271344921 -0700 @@ -1,21 +1,22 @@ Network Working Group Y. Lee, Ed. Internet Draft Huawei Technologies Intended status: Standard R. Casellas, Ed. -Expires: January 2016 CTTC +Expires: February 2017 +CTTC - February 11, 2016 + August 15, 2016 PCEP Extension for WSON Routing and Wavelength Assignment - draft-ietf-pce-wson-rwa-ext-04.txt + draft-ietf-pce-wson-rwa-ext-05.txt Abstract This document provides the Path Computation Element communication Protocol (PCEP) extensions for the support of Routing and Wavelength Assignment (RWA) in Wavelength Switched Optical Networks (WSON). Lightpath provisioning in WSONs requires a routing and wavelength assignment (RWA) process. From a path computation perspective, wavelength assignment is the process of determining which wavelength can be used on each hop of a path and forms an additional routing @@ -34,21 +35,21 @@ Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. - This Internet-Draft will expire on August 11, 2016. + This Internet-Draft will expire on February 15, 2017. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents @@ -213,21 +214,21 @@ are used. Those modulation properties contribute not only to optical signal quality checks but also constrain the selection of sender and receiver, as they should have matching signal processing capabilities. This document includes signal compatibility constraints as part of RWA path computation. That is, the signal processing capabilities (e.g., modulation and FEC) by the means of optical interface class (OIC) must be compatible between the sender and the receiver of the optical path across all optical elements. This document, however, does not address optical impairments as part - of RWA path computation. See [RFC6566] and [RSVP-Imp] for more + of RWA path computation. See [WSON-Imp] and [RSVP-Imp] for more information on optical impairments and GMPLS. 4. Encoding of a RWA Path Request Figure 2 shows one typical PCE based implementation, which is referred to as the Combined Process (R&WA). With this architecture, the two processes of routing and wavelength assignment are accessed via a single PCE. This architecture is the base architecture from which the requirements have been specified in [RFC7449] and the PCEP extensions that are going to be specified in this document based on @@ -242,22 +243,23 @@ +----------------------------+ Figure 2 Combined Process (R&WA) architecture 4.1. Wavelength Assignment (WA) Object Wavelength allocation can be performed by the PCE by different means: (a) By means of Explicit Label Control (ELC) where the PCE allocates - which label to use for each interface/node along the path. - + which label to use for each interface/node along the path. in the + sense that the allocated labels MAY appear after an interface route + subobject. (b) By means of a Label Set where the PCE provides a range of potential labels to allocate by each node along the path. Option (b) allows distributed label allocation (performed during signaling) to complete wavelength assignment. Additionally, given a range of potential labels to allocate, the request SHOULD convey the heuristic / mechanism to the allocation. The format of a PCReq message after incorporating the WA object is @@ -617,23 +620,23 @@ | Allocated Wavelength(s) | // . . . . // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 6 Wavelength Allocation TLV Encoding o Reserved: Reserved for future use (31 bits) o M (Mode): 1 bit - . 0 - indicates the allocation is under Explicit Label Control. + . 0 - - indicates the allocation is under Explicit Label Control. - . 1 - indicates the allocation is expressed in Label Sets. + . 1 - - indicates the allocation is expressed in Label Sets. Note that all link identifiers in the same list must be of the same type. o Link Identifier (variable): Identifies the interface to which assignment wavelength(s) is applied. See Section 4.2.1. for Link Identifier encoding. o Assigned Wavelength(s) (variable): Indicates the assigned wavelength(s) to the link identifier. See Section 4.2.2 for encoding @@ -926,37 +929,38 @@ [RFC6205] Tomohiro, O. and D. Li, "Generalized Labels for Lambda- Switching Capable Label Switching Routers", RFC 6205, January, 2011. [RFC7689] Bernstein et al,''Signaling Extensions for Wavelength Switched Optical Networks'', RFC 7689, November 2015. [RFC7688] Y. Lee, and G. Bernstein,''OSPF Enhancement for Signal and Network Element Compatibility for Wavelength Switched - Optical Networks'', RFC 7688, November, 2015. + Optical Networks'', RFC 7688, November 2015. [RFC7446] Y. Lee, G. Bernstein. (Editors), ''Routing and Wavelength Assignment Information Model for Wavelength Switched Optical Networks'', RFC 7446, February 2015. [RFC7581] Bernstein and Lee, ''Routing and Wavelength Assignment Information Encoding for Wavelength Switched Optical Networks'', RFC7581, June 2015. [RFC7579] Bernstein and Lee, ''General Network Element Constraint Encoding for GMPLS Controlled Networks'', RFC 7579, June 2015. - [RFC6566] Y. Lee, G. Bernstein, D. Li, G. Martinelli, "A Framework + [WSON-Imp] Y. Lee, G. Bernstein, D. Li, G. Martinelli, "A Framework for the Control of Wavelength Switched Optical Networks - (WSON) with Impairments", RFC 6566, March 2012. + (WSON) with Impairments", draft-ietf-ccamp-wson- + impairments, work in progress. [RSVP-Imp] agraz, ''RSVP-TE Extensions in Support of Impairment Aware Routing and Wavelength Assignment in Wavelength Switched Optical Networks WSONs)'', draft-agraz-ccamp-wson- impairment-rsvp, work in progress. [OSPF-Imp] Bellagamba, et al., ''OSPF Extensions for Wavelength Switched Optical Networks (WSON) with Impairments'',draft- eb-ccamp-ospf-wson-impairments, work in progress.