Alternate Tunnel Encapsulation for Data Frames in CAPWAP
draft-ietf-opsawg-capwap-alt-tunnel-05

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Document Type Active Internet-Draft (opsawg WG)
Last updated 2015-10-14 (latest revision 2015-04-26)
Replaces draft-zhang-opsawg-capwap-cds
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Network Working Group                                           R. Zhang
Internet-Draft                                             China Telecom
Intended status: Standards Track                                  Z. Cao
Expires: October 28, 2015                                        H. Deng
                                                            China Mobile
                                                           R. Pazhyannur
                                                           S. Gundavelli
                                                                   Cisco
                                                                  L. Xue
                                                                  Huawei
                                                          April 26, 2015

        Alternate Tunnel Encapsulation for Data Frames in CAPWAP
                 draft-ietf-opsawg-capwap-alt-tunnel-05

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.  Further, it may also be desirable to use
   different tunnel encapsulations to carry the stations' data frames.
   This document provides a specification for this 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 or 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 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

Zhang, et al.           Expires October 28, 2015                [Page 1]
Internet-Draft              Alternate Tunnel                  April 2015

   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 October 28, 2015.

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   Copyright (c) 2015 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 . . . . . . . . . . . .   6
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   6
   2.  Alternate Tunnel Encapsulation  . . . . . . . . . . . . . . .   7
     2.1.  Description . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Protocol Considerations . . . . . . . . . . . . . . . . . . .   9
     3.1.  Supported Alternate Tunnel Encapsulations . . . . . . . .   9
     3.2.  Alternate Tunnel Encapsulations Type  . . . . . . . . . .  10
     3.3.  IEEE 802.11 WTP Alternate Tunnel Failure Indication . . .  11
     3.4.  CAPWAP based Alternate Tunnel . . . . . . . . . . . . . .  11
     3.5.  PMIPv6 based Alternate Tunnel . . . . . . . . . . . . . .  12
     3.6.  Alternate Tunnel Information Elements . . . . . . . . . .  13
       3.6.1.  Access Router Information Sub-Elements  . . . . . . .  13
       3.6.2.  Tunnel DTLS Policy Sub-Element  . . . . . . . . . . .  15
       3.6.3.  IEEE 802.11 Tagging Mode Policy Sub-Element . . . . .  16
       3.6.4.  CAPWAP Transport Protocol Sub-Element . . . . . . . .  16
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