--- 1/draft-ietf-idr-bgp-ls-segment-routing-msd-00.txt 2017-10-16 08:13:23.194902845 -0700 +++ 2/draft-ietf-idr-bgp-ls-segment-routing-msd-01.txt 2017-10-16 08:13:23.210903223 -0700 @@ -1,60 +1,60 @@ IDR Working Group J. Tantsura Internet-Draft Individual Intended status: Standards Track U. Chunduri -Expires: January 18, 2018 Huawei Technologies +Expires: April 18, 2018 Huawei Technologies G. Mirsky ZTE Corp. S. Sivabalan Cisco - July 17, 2017 + October 15, 2017 Signaling Maximum SID Depth using Border Gateway Protocol Link-State - draft-ietf-idr-bgp-ls-segment-routing-msd-00 + draft-ietf-idr-bgp-ls-segment-routing-msd-01 Abstract This document proposes a way to signal Maximum SID Depth (MSD) supported by a node at node and/or link granularity by a BGP-LS speaker. In a Segment Routing (SR) enabled network a centralized controller that programs SR tunnels needs to know the MSD supported by the head-end at node and/or link granularity to push the SID stack of an appropriate depth. MSD is relevant to the head-end of a SR tunnel or Binding-SID anchor node where Binding-SID expansions might result in creation of a new SID stack. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- - Drafts is at http://datatracker.ietf.org/drafts/current/. + Drafts is at https://datatracker.ietf.org/drafts/current/. 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." - This Internet-Draft will expire on January 18, 2018. + This Internet-Draft will expire on April 18, 2018. Copyright Notice Copyright (c) 2017 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 + (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents 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 . . . . . . . . . . . . . . . . . . . . . . . . 2 @@ -147,22 +147,22 @@ 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 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sub-Type and Value ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ... Figure 1: Node attribute format Type : A 2-octet field specifiying code-point of the new TLV type. - Code-point:(to be assigned by IANA) from BGP-LS Node Descriptor, Link - Descriptor, Prefix Descriptor, and Attribute TLVs registry + Code-point:(TBD1) from BGP-LS Node Descriptor, Link Descriptor, + Prefix Descriptor, and Attribute TLVs registry Length: A 2-octet field that indicates the length of the value portion Sub-Type and value fields are as defined in corresponding OSPF [I-D.ietf-ospf-segment-routing-msd] and IS-IS [I-D.ietf-isis-segment-routing-msd] extensions. 4. MSD supported on a link @@ -173,34 +173,36 @@ 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 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sub-Type and Value ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ... Figure 2: Link attribute format Type : A 2-octet field specifiying code-point of the new TLV type. - Code-point:(to be assigned by IANA) from BGP-LS Node Descriptor, Link - Descriptor, Prefix Descriptor, and Attribute TLVs registry + Code-point:(TBD2) from BGP-LS Node Descriptor, Link Descriptor, + Prefix Descriptor, and Attribute TLVs registry Length: A 2-octet field that indicates the length of the value portion Sub-Type and value fields are as defined in corresponding OSPF [I-D.ietf-ospf-segment-routing-msd] and IS-IS [I-D.ietf-isis-segment-routing-msd] extensions. 5. IANA Considerations - This document requests IANA to assign 2 new code-points from the BGP- - LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute - TLVs registry as specified in sections 3 and 4. + We request IANA assign code points from the registry BGP-LS Node + Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs, + as follows: TLV Code Point Description IS-IS TLV/Sub-TLV Reference + TBD1 Node MSD 242/23 (this document) TBD2 Link MSD + (22,23,25,141,222,223)/15 (this document) 6. Security Considerations This document does not introduce security issues beyond those discussed in [RFC7752] 7. Acknowledgements We like to thank Nikos Triantafillis, Stephane Litkowski and Bruno Decraene for their reviews and valuable comments. @@ -217,54 +219,54 @@ [I-D.ietf-ospf-segment-routing-msd] Tantsura, J., Chunduri, U., Aldrin, S., and P. Psenak, "Signaling MSD (Maximum SID Depth) using OSPF", draft- ietf-ospf-segment-routing-msd-05 (work in progress), June 2017. [I-D.ietf-pce-segment-routing] Sivabalan, S., Filsfils, C., Tantsura, J., Henderickx, W., and J. Hardwick, "PCEP Extensions for Segment Routing", - draft-ietf-pce-segment-routing-09 (work in progress), - April 2017. + draft-ietf-pce-segment-routing-10 (work in progress), + October 2017. [I-D.ietf-spring-segment-routing-mpls] Filsfils, C., Previdi, S., Bashandy, A., Decraene, B., Litkowski, S., and R. Shakir, "Segment Routing with MPLS data plane", draft-ietf-spring-segment-routing-mpls-10 (work in progress), June 2017. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, - . + . [RFC7752] Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and S. Ray, "North-Bound Distribution of Link-State and Traffic Engineering (TE) Information Using BGP", RFC 7752, DOI 10.17487/RFC7752, March 2016, - . + . 8.2. Informative References [I-D.ietf-isis-segment-routing-extensions] Previdi, S., Filsfils, C., Bashandy, A., Gredler, H., Litkowski, S., Decraene, B., and j. jefftant@gmail.com, "IS-IS Extensions for Segment Routing", draft-ietf-isis- segment-routing-extensions-13 (work in progress), June 2017. [I-D.ietf-ospf-segment-routing-extensions] Psenak, P., Previdi, S., Filsfils, C., Gredler, H., Shakir, R., Henderickx, W., and J. Tantsura, "OSPF Extensions for Segment Routing", draft-ietf-ospf-segment- - routing-extensions-17 (work in progress), June 2017. + routing-extensions-19 (work in progress), August 2017. Authors' Addresses Jeff Tantsura Individual Email: jefftant.ietf@gmail.com Uma Chunduri Huawei Technologies