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The Subnetwork Encapsulation and Adaptation Layer (SEAL)
draft-templin-intarea-seal-68

Document type: Active Internet-Draft (individual)
Document stream: ISE
Last updated: 2014-01-03
Intended RFC status: Experimental
Other versions: plain text, xml, pdf, html

ISE State: In ISE Review
Document shepherd: No shepherd assigned

IESG State: I-D Exists (IESG: Dead)
Responsible AD: Ralph Droms
IESG Note: Joe Touch (touch@isi.edu) is the document shepherd.
Send notices to: fltemplin@acm.org, draft-templin-intarea-seal@tools.ietf.org

Network Working Group                                    F. Templin, Ed.
Internet-Draft                              Boeing Research & Technology
Obsoletes: rfc5320 (if approved)                        January 03, 2014
Updates: rfc2460 (if approved)
Intended status: Standards Track
Expires: July 7, 2014

        The Subnetwork Encapsulation and Adaptation Layer (SEAL)
                   draft-templin-intarea-seal-68.txt

Abstract

   This document specifies a Subnetwork Encapsulation and Adaptation
   Layer (SEAL).  SEAL operates over virtual topologies configured over
   connected IP network routing regions bounded by encapsulating border
   nodes.  These virtual topologies are manifested by tunnels that may
   span multiple IP and/or sub-IP layer forwarding hops, where they may
   incur packet duplication, packet reordering, source address spoofing
   and traversal of links with diverse Maximum Transmission Units
   (MTUs).  SEAL addresses these issues through the encapsulation and
   messaging mechanisms specified in this document.

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
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   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 July 7, 2014.

Copyright Notice

   Copyright (c) 2014 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

Templin                   Expires July 7, 2014                  [Page 1]
Internet-Draft                    SEAL                      January 2014

   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.

Templin                   Expires July 7, 2014                  [Page 2]
Internet-Draft                    SEAL                      January 2014

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Approach . . . . . . . . . . . . . . . . . . . . . . . . .  6
     1.3.  Differences with RFC5320 . . . . . . . . . . . . . . . . .  7
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  8
   3.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . .  9
   4.  Applicability Statement  . . . . . . . . . . . . . . . . . . .  9
   5.  SEAL Specification . . . . . . . . . . . . . . . . . . . . . . 10
     5.1.  SEAL Tunnel Model  . . . . . . . . . . . . . . . . . . . . 10
     5.2.  SEAL Model of Operation  . . . . . . . . . . . . . . . . . 11
     5.3.  SEAL Encapsulation Format  . . . . . . . . . . . . . . . . 12
     5.4.  ITE Specification  . . . . . . . . . . . . . . . . . . . . 13
       5.4.1.  Tunnel MTU . . . . . . . . . . . . . . . . . . . . . . 13
       5.4.2.  Tunnel Neighbor Soft State . . . . . . . . . . . . . . 14
       5.4.3.  SEAL Layer Pre-Processing  . . . . . . . . . . . . . . 15
       5.4.4.  SEAL Encapsulation and Fragmentation . . . . . . . . . 16
       5.4.5.  Outer Encapsulation  . . . . . . . . . . . . . . . . . 16
       5.4.6.  Path MTU Probing and ETE Reachability Verification . . 17
       5.4.7.  Processing ICMP Messages . . . . . . . . . . . . . . . 18
       5.4.8.  Detecting Path MTU Changes . . . . . . . . . . . . . . 19
     5.5.  ETE Specification  . . . . . . . . . . . . . . . . . . . . 19
       5.5.1.  Reassembly Buffer Requirements . . . . . . . . . . . . 19
       5.5.2.  Tunnel Neighbor Soft State . . . . . . . . . . . . . . 19
       5.5.3.  IPv4-Layer Reassembly  . . . . . . . . . . . . . . . . 19
       5.5.4.  Decapsulation, SEAL-Layer Reassembly, and
               Re-Encapsulation . . . . . . . . . . . . . . . . . . . 20
   6.  Link Requirements  . . . . . . . . . . . . . . . . . . . . . . 21
   7.  End System Requirements  . . . . . . . . . . . . . . . . . . . 21

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