INTERNET-DRAFT Khuzema Pithewan Intended Status: Standard Track Rajan Rao Infinera Expires: February 2, 2013 August 1, 2012 OSPF-TE extensions for MLNMRN based on OTN draft-rao-ccamp-otn-mlnmrn-ospfte-ext-00.txt Abstract This document specifies OSPF extensions for multi-layer/multi-region where one of the regions is OTN. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Copyright and License Notice Copyright (c) 2012 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 Khuzema Pithewan Expires February 2, 2013 [Page 1] INTERNET DRAFTdraft-rao-ccamp-otn-mlnmrn-ospfte-ext-00.txtAugust 1, 2012 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. OTN Layer Identification . . . . . . . . . . . . . . . . . . . 3 3. Interface Adjustment Capability Extensions for OTN . . . . . . 4 4 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 6 Security Considerations . . . . . . . . . . . . . . . . . . . . 5 7 References . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 Khuzema Pithewan Expires February 2, 2013 [Page 2] INTERNET DRAFTdraft-rao-ccamp-otn-mlnmrn-ospfte-ext-00.txtAugust 1, 2012 1 Introduction This document specifies the OSPF extensions required to work in multi-region networks involving OTN. The specification is based on the requirement as specified in RFC 5212. As per the said RFC, ISCD characterizes the information associated to one or more network layers. Same RFC also says that the information about the adjustment capabilities of the nodes in the network allow the path computation process to select an end-to-end multi-layer or multi- region path that includes links with different switching capabilities joined by LSRs that can adapt (i.e., adjust) the signal between the links. By inference, information about the adjustment capabilities should be able to identify a layer in ISCD, if ISCD specifies more than one layer. RFC6001 specifies how to advertise adjustment capabilities between two switching regions. IACD definition has provision to extend it for a specific technology through Adjustment Capability Specific information (ACSI) field, if required. ACSI field can be used to identify a layer in the multi-layer ISCD. OTN being defined as multi- layer ISCD, the corresponding IACD needs to be extended to be able to carry layer identification so as to enable multi-layer/multi-region path computation. 2. OTN Layer Identification [GMPLS-OTN-OSPF] defines attributes that identifies a layer in multi- layer OTN ISCD. These attributes are part of Bandwidth sub-TLV in Switch capability specific information of ISCD. These attributes are reproduced here for completeness sake. * Signal Type: Layer for which bandwidth is being advertised. * Hierarchy : also called as multiplexing branch that specifies all the layers between server layer and signal type. * TSG : Time Slot Granularity Khuzema Pithewan Expires February 2, 2013 [Page 3] INTERNET DRAFTdraft-rao-ccamp-otn-mlnmrn-ospfte-ext-00.txtAugust 1, 2012 3. Interface Adjustment Capability Extensions for OTN RFC6001 defines IACD sub-TLV as follows. Please refer to the RFC for definition of individual fields of the sub-TLV. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Lower SC | Lower Encoding| Upper SC | Upper Encoding| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 5 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 6 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 7 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Adjustment Capability-specific information | | (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Adjustment Capability-specific information abbreviated as ACSI henceforth for OTN G.709v3 carries LayerID Sub-TLV which is defined as follows 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type = 1 (LayerID TLV) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Signal type | Num of stages |TSG | Res | Stage#1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Stage#2 | ... | Stage#N | Padding | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The definition & meaning of fields used in the above sub-TLV is same as in bandwidth sub-TLV of ISCD as defined in [GMPLS-OTN-OSPF]. This LayerID sub-TLV is applicable only when one of the regions is OTN, which means either lower or upper SC and Encoding type MUST have Switch Cap as OTN-TDM and encoding type as G.709 ODUk. The 8 Khuzema Pithewan Expires February 2, 2013 [Page 4] INTERNET DRAFTdraft-rao-ccamp-otn-mlnmrn-ospfte-ext-00.txtAugust 1, 2012 priorities of the BW as defined in main IACD structure, is adjustment capability between the two regions where one of the region is identifies by LayerID sub-TLV. 4 Procedure A node advertising IACD for the bandwidth between a non-OTN interface and an OTN interface MUST include the Layer ID TLV as part of ACSI as defined above. For multi-region path computation, the path computing node MUST look at the LayerID sub-TLV (in ACSI part of IACD) if lower/upper SC and encoding type is OTN-TDM and G.709 ODUk respectively to identify the layer in OTN ISCD. 5 IANA Considerations TBD 6 Security Considerations TBD 7 References [RFC5212] K. Shiomoto, Papadimitriou, D.,JL. Le Roux, Vigoureux, M., Brungard, D., "Requirements for GMPLS-Based Multi-Layer and Multi-Region Networks (MLN/ MRN)",RFC 5212, July 2008. [RFC6001] Papadimitriou, D., Vigoureux, M., Shiomoto, K., Brungard, D., and JL. Le Roux, "Generalized MPLS (GMPLS) Protocol Extensions for Multi-Layer and Multi-Region Networks (MLN/MRN)", RFC 6001, October 2010. [GMPLS-OTN-OSPF] Traffic Engineering Extensions to OSPF for Generalized MPLS (GMPLS) 8 Authors' Addresses Khuzema Pithewan Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: kpithewan@infinera.com Rajan Rao Infinera 140 Caspian Ct., Sunnyvale, CA 94089 Email: rrao@infinera.com Khuzema Pithewan Expires February 2, 2013 [Page 5]