IDR Group Yao. Liu Internet-Draft Shaofu. Peng Intended status: Standards Track ZTE Corporation Expires: April 18, 2021 October 15, 2020 BGP Extensions to Support Packet Network Slicing in SR Policy draft-liu-idr-bgp-network-slicing-01 Abstract [I-D.peng-teas-network-slicing] defines a unified TN-slice identifier, AII(administrative instance identifier), to indicate the topology, computing, storage resources of the dedicated virtual network for both intra-domain and inter-domain network slicing scenarios. This document defines extensions to BGP in order to advertise AII in SR policies. 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 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 April 18, 2021. Copyright Notice Copyright (c) 2020 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 (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 Liu & Peng Expires April 18, 2021 [Page 1] Internet-Draft BGP for NS in SR Policy October 2020 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. SR policy with AII . . . . . . . . . . . . . . . . . . . . . 2 3. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.1. Normative References . . . . . . . . . . . . . . . . . . 4 6.2. Informative References . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction For a packet network, network slicing requires the underlying network to support partitioning of the network resources to provide the client with dedicated (private) networking, computing, and storage resources drawn from a shared pool. [I-D.peng-teas-network-slicing] defines a unified TN-slice identifier, AII(administrative instance identifier), to indicate the topology, computing, storage resources of the dedicated virtual network for both intra-domain and inter-domain network slicing scenarios, and how to compute SR-BE or SR-TE path according to TN- slice Identifier combined with other creteria. [I-D.ietf-spring-segment-routing-policy] details the concepts of SR Policy and steering into an SR Policy.[I-D.ietf-idr-segment-routing-te-policy] specifies the way to use BGP to distribute one or more of the candidate paths of an SR Policy to the headend of that policy. This document defines extensions to BGP in order to advertise AII in SR-TE policies. 2. SR policy with AII To distinguish forwarding behavior of different virtual networks, each segment lists in SR policy need to be computed within the scope of TN-slice identified by AII. As AII has global significance, all segments of the same segment list can share a single AII. This document defines a new AII sub-TLV in Segment List Sub-TLV to indicate which slice this segment list belongs to, Liu & Peng Expires April 18, 2021 [Page 2] Internet-Draft BGP for NS in SR Policy October 2020 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=TBD1 | Length | Flags | RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | AII | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: AII sub-TLV in Segment List Sub-TLV where: o Type: TBD1 o Length: 6 o Flags: 1 octet of flags. None are defined at this stage. Flags SHOULD be set to zero on transmission and MUST be ignored on receipt. o RESERVED: 1 octet of reserved bits. SHOULD be set to zero on transmission and MUST be ignored on receipt. o AII: Identifies the TN-slice (AII) information corresponding to the segment list. 3. Operations The operations about advertisement and reception of SR policy can refer to [I-D.ietf-idr-segment-routing-te-policy]. Typically, a controller or a PCE can compute SR path taking acount of AII criteria, so that the SR path can be limited in the scope of TN-slice identified by AII. The AII information contained in Segment List Sub-TLV can help the headend to translate the segment to AII related SID, if the Segment Sub-TLV has not provided optional SID information. Even if Segment Sub-TLV has provided valid SID information, it is also beneficial for the headend to know which slice this path belongs to, according to the AII information contained in Segment List Sub- TLV. 4. Security Considerations Procedures and protocol extensions defined in this document do not affect the security considerations discussed in [I-D.ietf-idr-segment-routing-te-policy]. Liu & Peng Expires April 18, 2021 [Page 3] Internet-Draft BGP for NS in SR Policy October 2020 5. IANA Considerations TBD 6. References 6.1. Normative References [I-D.ietf-idr-segment-routing-te-policy] Previdi, S., Filsfils, C., Talaulikar, K., Mattes, P., Rosen, E., Jain, D., and S. Lin, "Advertising Segment Routing Policies in BGP", draft-ietf-idr-segment-routing- te-policy-09 (work in progress), May 2020. [I-D.ietf-spring-segment-routing-policy] Filsfils, C., Talaulikar, K., Voyer, D., Bogdanov, A., and P. Mattes, "Segment Routing Policy Architecture", draft- ietf-spring-segment-routing-policy-08 (work in progress), July 2020. [I-D.peng-teas-network-slicing] Peng, S., Chen, R., Mirsky, G., and F. Qin, "Packet Network Slicing using Segment Routing", draft-peng-teas- network-slicing-03 (work in progress), February 2020. 6.2. Informative References [I-D.zch-lsr-isis-network-slicing] Zhu, Y., Chen, R., Peng, S., and F. Qin, "IS-IS Extensions to Support Transport Network Slices using Segment Routing", draft-zch-lsr-isis-network-slicing-06 (work in progress), September 2020. Authors' Addresses Liu Yao ZTE Corporation No. 50 Software Ave, Yuhuatai Distinct Nanjing China Email: liu.yao71@zte.com.cn Liu & Peng Expires April 18, 2021 [Page 4] Internet-Draft BGP for NS in SR Policy October 2020 Peng Shaofu ZTE Corporation No. 50 Software Ave, Yuhuatai Distinct Nanjing China Email: peng.shaofu@zte.com.cn Liu & Peng Expires April 18, 2021 [Page 5]