datatracker.ietf.org
Sign in
Version 5.3.0, 2014-04-12
Report a bug

DS-Lite Failure Detection and Failover
draft-tsou-softwire-bfd-ds-lite-06

Document type: Active Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2014-02-12
Intended RFC status: Unknown
Other versions: plain text, pdf, html

Stream State:No stream defined
Document shepherd: No shepherd assigned

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

Internet Engineering Task Force                                  T. Tsou
Internet-Draft                                 Huawei Technologies (USA)
Intended status: Informational                                     B. Li
Expires: August 17, 2014                                         C. Zhou
                                                     Huawei Technologies
                                                        J. Schoenwaelder
                                                Jacobs University Bremen
                                                                R. Penno
                                                     Cisco Systems, Inc.
                                                            M. Boucadair
                                                          France Telecom
                                                       February 13, 2014

                 DS-Lite Failure Detection and Failover
                   draft-tsou-softwire-bfd-ds-lite-06

Abstract

   In DS-Lite, the tunnel is stateless, not associated with any state
   information, and the CGN function at the AFTR is stateful.
   Currently, there is no failure detection and failover mechanism for
   both stateless tunnel and stateful CGN function, which makes it
   difficult to manage and diagnose if there is a problem.  This draft
   analyzes the applicability of some of the possible solutions.

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/.

   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 August 17, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Tsou, et al.             Expires August 17, 2014                [Page 1]
Internet-Draft   DS-Lite Failure Detection and Failover    February 2014

   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Failover Mechanisms  . . . . . . . . . . . . . . . . . . . . .  3
     3.1.  Anycast Approach . . . . . . . . . . . . . . . . . . . . .  4
     3.2.  VRRP Approach  . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Solutions  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.1.  Bidirectional Forwarding Detection (BFD) . . . . . . . . .  4
       4.1.1.  DS-Lite Scenario . . . . . . . . . . . . . . . . . . .  5
       4.1.2.  Parameters for BFD . . . . . . . . . . . . . . . . . .  5
       4.1.3.  Elements of Procedure  . . . . . . . . . . . . . . . .  6
       4.1.4.  BFD for NAT failure detection  . . . . . . . . . . . .  6
       4.1.5.  Implementation Considerations  . . . . . . . . . . . .  6
     4.2.  Port Control Protocol (PCP)  . . . . . . . . . . . . . . .  7
     4.3.  ICMP Echo Request / Echo Reply (PING)  . . . . . . . . . .  7
     4.4.  Comparison of Different Solutions  . . . . . . . . . . . .  8
   5.  State Synchronization and Session Re-establishment . . . . . .  8
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     9.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

Tsou, et al.             Expires August 17, 2014                [Page 2]
Internet-Draft   DS-Lite Failure Detection and Failover    February 2014

[include full document text]