Alternate Tunnel Encapsulation for Data Frames in Control and Provisioning of Wireless Access Points (CAPWAP)
RFC 8350
Internet Engineering Task Force (IETF) R. Zhang
Request for Comments: 8350 China Telecom
Category: Experimental R. Pazhyannur
ISSN: 2070-1721 S. Gundavelli
Cisco
Z. Cao
H. Deng
Z. Du
Huawei
April 2018
Alternate Tunnel Encapsulation for Data Frames in
Control and Provisioning of Wireless Access Points (CAPWAP)
Abstract
Control and Provisioning of Wireless Access Points (CAPWAP) is a
protocol for encapsulating 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 an extension to the CAPWAP
protocol that supports 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, or CAPWAP. The WTP may
advertise support for alternate tunnel encapsulation during the
discovery and join process, and the AC may select one of the
supported alternate tunnel encapsulation types while configuring the
WTP.
Zhang, et al. Experimental [Page 1]
RFC 8350 Alternate Tunnel April 2018
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 candidates for any level of
Internet Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8350.
Copyright Notice
Copyright (c) 2018 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
(https://trustee.ietf.org/license-info) in effect on the date of
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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.
Zhang, et al. Experimental [Page 2]
RFC 8350 Alternate Tunnel April 2018
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 . . . . . . . . . . . 9
3. Extensions for CAPWAP Protocol Message Elements . . . . . . . 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 . . . . . . . . . . . . 16
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