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IBM's Shared Memory Communications over RDMA (SMC-R) Protocol (RFC7609) Disclosure Number: IPCOM000242783D
Original Publication Date: 2015-Aug-01
Included in the Prior Art Database: 2015-Aug-15

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Fox: AUTHOR [+2]


This document specifies IBM's Shared Memory Communications over RDMA (SMC-R) protocol. SMC-R is a protocol for Remote Direct Memory Access (RDMA) communication between TCP socket endpoints. SMC-R runs over networks that support RDMA over Converged Ethernet (RoCE). It is designed to permit existing TCP applications to benefit from RDMA without requiring modifications to the applications or predefinition of RDMA partners.

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Independent Submission                                            M. Fox Request for Comments: 7609                                   C. Kassimis Category: Informational                                       J. Stevens ISSN: 2070-1721                                                      IBM                                                              August 2015

      IBM's Shared Memory Communications over RDMA (SMC-R) Protocol


   This document describes IBM's Shared Memory Communications over RDMA    (SMC-R) protocol.  This protocol provides Remote Direct Memory Access    (RDMA) communications to TCP endpoints in a manner that is    transparent to socket applications.  It further provides for dynamic    discovery of partner RDMA capabilities and dynamic setup of RDMA    connections, as well as transparent high availability and load    balancing when redundant RDMA network paths are available.  It    maintains many of the traditional TCP/IP qualities of service such as    filtering that enterprise users demand, as well as TCP socket    semantics such as urgent data.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   This is a contribution to the RFC Series, independently of any other    RFC stream.  The RFC Editor has chosen to publish this document at    its discretion and makes no statement about its value for    implementation or deployment.  Documents approved for publication by    the RFC Editor are not a candidate for any level of Internet    Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Fox, et al.                   Informational                     [Page 1]
 RFC 7609      IBM's Shared Memory Communications over RDMA   August 2015

 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    ( 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.

Table of Contents

   1. Introduction ....................................................5

      1.1. Protocol Overview ..........................................6

           1.1.1. Hardware Requirements ..........................