Alternate Tunnel Encapsulation for Data Frames in CAPWAP
draft-ietf-opsawg-capwap-alt-tunnel-10

Document Type Active Internet-Draft (opsawg WG)
Last updated 2017-12-13 (latest revision 2017-09-08)
Replaces draft-zhang-opsawg-capwap-cds
Stream IETF
Intended RFC status Experimental
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Stream WG state Submitted to IESG for Publication
Document shepherd Tianran Zhou
Shepherd write-up Show (last changed 2017-10-17)
IESG IESG state Waiting for AD Go-Ahead
Consensus Boilerplate Yes
Telechat date
Needs a YES.
Responsible AD Warren Kumari
Send notices to warren@kumari.net, Tianran Zhou <zhoutianran@huawei.com>
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IANA action state None
Opsawg Working Group                                            R. Zhang
Internet-Draft                                             China Telecom
Intended status: Experimental                              R. Pazhyannur
Expires: March 9, 2018                                     S. Gundavelli
                                                                   Cisco
                                                                  Z. Cao
                                                                 H. Deng
                                                                   Z. Du
                                                                  Huawei
                                                       September 5, 2017

        Alternate Tunnel Encapsulation for Data Frames in CAPWAP
                 draft-ietf-opsawg-capwap-alt-tunnel-10

Abstract

   Control and Provisioning of Wireless Access Points (CAPWAP) defines a
   specification to encapsulate a station's data frames between the
   Wireless Transmission Point (WTP) and Access Controller (AC).
   Specifically, the station's IEEE 802.11 data frames can be either
   locally bridged or tunneled to the AC.  When tunneled, a CAPWAP data
   channel is used for tunneling.  In many deployments encapsulating
   data frames to an entity other than the AC (for example to an Access
   Router (AR)) is desirable.  Furthermore, it may also be desirable to
   use different tunnel encapsulation modes between the WTP and the
   Access Router.  This document defines extension to CAPWAP protocol
   for supporting this capability and refers to it as alternate tunnel
   encapsulation.  The alternate tunnel encapsulation allows 1) the WTP
   to tunnel non-management data frames to an endpoint different from
   the AC and 2) the WTP to tunnel using one of many known encapsulation
   types such as IP-IP, IP-GRE, CAPWAP.  The WTP may advertise support
   for alternate tunnel encapsulation during the discovery and join
   process and AC may select one of the supported alternate tunnel
   encapsulation types while configuring the WTP.

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
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   Drafts is at https://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

Zhang, et al.             Expires March 9, 2018                 [Page 1]
Internet-Draft              Alternate Tunnel              September 2017

   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 March 9, 2018.

Copyright Notice

   Copyright (c) 2017 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions used in this document . . . . . . . . . . . .   7
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   7
     1.3.  History of the document . . . . . . . . . . . . . . . . .   8
   2.  Alternate Tunnel Encapsulation Overview . . . . . . . . . . .   8
   3.  CAPWAP Protocol Message Elements Extensions . . . . . . . . .  11
     3.1.  Supported Alternate Tunnel Encapsulations . . . . . . . .  11
     3.2.  Alternate Tunnel Encapsulations Type  . . . . . . . . . .  11
     3.3.  IEEE 802.11 WTP Alternate Tunnel Failure Indication . . .  12
   4.  Alternate Tunnel Types  . . . . . . . . . . . . . . . . . . .  13
     4.1.  CAPWAP based Alternate Tunnel . . . . . . . . . . . . . .  13
     4.2.  PMIPv6 based Alternate Tunnel . . . . . . . . . . . . . .  14
     4.3.  GRE based Alternate Tunnel  . . . . . . . . . . . . . . .  15
   5.  Alternate Tunnel Information Elements . . . . . . . . . . . .  15
     5.1.  Access Router Information Elements  . . . . . . . . . . .  15
       5.1.1.  AR IPv4 List Element  . . . . . . . . . . . . . . . .  16
       5.1.2.  AR IPv6 List Element  . . . . . . . . . . . . . . . .  16
     5.2.  Tunnel DTLS Policy Element  . . . . . . . . . . . . . . .  17
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