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Protocol Support for High Availability of IKEv2/IPsec
RFC 6311

Internet Engineering Task Force (IETF)                     R. Singh, Ed.
Request for Comments: 6311                                    G. Kalyani
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                                   Y. Nir
                                                             Check Point
                                                              Y. Sheffer
                                                                Porticor
                                                                D. Zhang
                                                                  Huawei
                                                               July 2011

         Protocol Support for High Availability of IKEv2/IPsec

Abstract

   The IPsec protocol suite is widely used for business-critical network
   traffic.  In order to make IPsec deployments highly available, more
   scalable, and failure-resistant, they are often implemented as IPsec
   High Availability (HA) clusters.  However, there are many issues in
   IPsec HA clustering, and in particular in Internet Key Exchange
   Protocol version 2 (IKEv2) clustering.  An earlier document, "IPsec
   Cluster Problem Statement", enumerates the issues encountered in the
   IKEv2/IPsec HA cluster environment.  This document resolves these
   issues with the least possible change to the protocol.

   This document defines an extension to the IKEv2 protocol to solve the
   main issues of "IPsec Cluster Problem Statement" in the commonly
   deployed hot standby cluster, and provides implementation advice for
   other issues.  The main issues solved are the synchronization of
   IKEv2 Message ID counters, and of IPsec replay counters.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in 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
   http://www.rfc-editor.org/info/rfc6311.

Singh, et al.                Standards Track                    [Page 1]
RFC 6311            High Availability in IKEv2/IPsec           July 2011

Copyright Notice

   Copyright (c) 2011 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
   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.

Singh, et al.                Standards Track                    [Page 2]
RFC 6311            High Availability in IKEv2/IPsec           July 2011

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................5
   3. Issues Resolved from IPsec Cluster Problem Statement ............7
      3.1. Large Amount of State ......................................8
      3.2. Multiple Members Using the Same SA .........................9
      3.3. Avoiding Collisions in SPI Number Allocation ...............9
      3.4. Interaction with Counter Modes .............................9
   4. The IKEv2/IPsec SA Counter Synchronization Problem .............10
   5. SA Counter Synchronization Solution ............................11
      5.1. Processing Rules for IKE Message ID Synchronization .......13
      5.2. Processing Rules for IPsec Replay Counter
           Synchronization ...........................................14
   6. IKEv2/IPsec Synchronization Notification Payloads ..............14
      6.1. The IKEV2_MESSAGE_ID_SYNC_SUPPORTED Notification ..........15
      6.2. The IPSEC_REPLAY_COUNTER_SYNC_SUPPORTED Notification ......15
      6.3. The IKEV2_MESSAGE_ID_SYNC Notification ....................16
      6.4. The IPSEC_REPLAY_COUNTER_SYNC Notification ................16
   7. Implementation Details .........................................17
   8. IKE SA and IPsec SA Message Sequencing .........................18
      8.1. Handling of Pending IKE Messages ..........................18

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