COIN H. Singh Internet-Draft MNK Consulting Intended status: Standards Track June 7, 2019 Expires: December 9, 2019 New IPv6 Multicast Address for Switch ML draft-hsingh-ipv6-coin-ml-00 Abstract Recently, in-network aggregation to scale distributed machine learning (ML) has been presented. A network switch implementation uses IPv4 broadcast messages from switch to the hosts to send updates to all workers. IPv6 does not support broadcast addresses. This document proposes, IPv6 implementations use the IPv6 link-local all- nodes multicast address to receive messages from a switch, until a new link-local multicast address is assigned by IANA for switch to hosts multicast communications for switch machine learning algorithms. 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 December 9, 2019. Copyright Notice Copyright (c) 2019 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 Singh Expires December 9, 2019 [Page 1] Internet-Draft IPv6 ML June 2019 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. Requirements Language . . . . . . . . . . . . . . . . . . . . 2 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Security Considerations . . . . . . . . . . . . . . . . . . . 2 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 6. Normative References . . . . . . . . . . . . . . . . . . . . 3 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. Introduction New computing in the network algorithms (https://p4.org/assets/P4WS_2019/ Speaker_Slides/7_1145am_Jacob_Nelson.pdf), for IPv6, have a need for multicast communication between network switch and host worker nodes. This document proposes a new well-known multicast address be defined for such communications. Until a new address is defined, the link- local all-nodes multicast address may be used. By definition, a layer-2 switch operates in the link-local subnet. Thus, the IPv6 link-local address defined by this document suffices for switch to host multicast communications. If a switch is configured in layer-3 mode, then IPv6 global multicast addresses will have to be used. Layer-3 mode of a switch is currently out of scope of this document. 3. Security Considerations 4. IANA Considerations This document proposes to use "FF02:0:0:0:0:0:1:8" link-local multicast address for use by network ML. This multicast address name is Switch_ML_Host. An interface on the host MUST join this well- known multicast address. Singh Expires December 9, 2019 [Page 2] Internet-Draft IPv6 ML June 2019 5. Acknowledgements Thanks (in alphabetical order by first name) to 6. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Author's Address Hemant Singh MNK Consulting 7 Caldwell Drive Westford, MA 01886 USA Phone: +1 978 692 2340 Email: hemant@mnkcg.com URI: http://mnkcg.com/ Singh Expires December 9, 2019 [Page 3]