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NSIS Operation over IP Tunnels
RFC 5979

Internet Engineering Task Force (IETF)                           C. Shen
Request for Comments: 5979                                H. Schulzrinne
Category: Experimental                                       Columbia U.
ISSN: 2070-1721                                                   S. Lee
                                                                 Samsung
                                                                 J. Bang
                                                             Samsung AIT
                                                              March 2011

                     NSIS Operation over IP Tunnels

Abstract

   NSIS Quality of Service (QoS) signaling enables applications to
   perform QoS reservation along a data flow path.  When the data flow
   path contains IP tunnel segments, NSIS QoS signaling has no effect
   within those tunnel segments.  Therefore, the resulting tunnel
   segments could become the weakest QoS link and invalidate the QoS
   efforts in the rest of the end-to-end path.  The problem with NSIS
   signaling within the tunnel is caused by the tunnel encapsulation
   that masks packets' original IP header fields.  Those original IP
   header fields are needed to intercept NSIS signaling messages and
   classify QoS data packets.  This document defines a solution to this
   problem by mapping end-to-end QoS session requests to corresponding
   QoS sessions in the tunnel, thus extending the end-to-end QoS
   signaling into the IP tunnel segments.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are 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
   http://www.rfc-editor.org/info/rfc5979.

Shen, et al.                  Experimental                      [Page 1]
RFC 5979             NSIS Operation over IP Tunnels           March 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Shen, et al.                  Experimental                      [Page 2]
RFC 5979             NSIS Operation over IP Tunnels           March 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Problem Statement  . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  IP Tunneling Protocols . . . . . . . . . . . . . . . . . .  6
     3.2.  NSIS QoS Signaling in the Presence of IP Tunnels . . . . .  7
   4.  Design Overview  . . . . . . . . . . . . . . . . . . . . . . . 10
     4.1.  Design Requirements  . . . . . . . . . . . . . . . . . . . 10
     4.2.  Overall Design Approach  . . . . . . . . . . . . . . . . . 11
     4.3.  Tunnel Flow ID for Different IP Tunneling Protocols  . . . 13
   5.  NSIS Operation over Tunnels with Preconfigured QoS Sessions  . 14
     5.1.  Sender-initiated Reservation . . . . . . . . . . . . . . . 14

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