draft-ietf-capwap-protocol-binding-ieee80211-01.txt   draft-ietf-capwap-protocol-binding-ieee80211-02.txt 
Network Working Group P. Calhoun, Editor Network Working Group P. Calhoun, Editor
Internet-Draft Cisco Systems, Inc. Internet-Draft Cisco Systems, Inc.
Expires: July 27, 2007 M. Montemurro, Editor Expires: September 5, 2007 M. Montemurro, Editor
Research In Motion Research In Motion
D. Stanley, Editor D. Stanley, Editor
Aruba Networks Aruba Networks
January 23, 2007 March 4, 2007
CAPWAP Protocol Binding for IEEE 802.11 CAPWAP Protocol Binding for IEEE 802.11
draft-ietf-capwap-protocol-binding-ieee80211-01 draft-ietf-capwap-protocol-binding-ieee80211-02
Status of this Memo Status of this Memo
By submitting this Internet-Draft, each author represents that any By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes have been or will be disclosed, and any of which he or she becomes
aware will be disclosed, in accordance with Section 6 of BCP 79. aware will be disclosed, in accordance with Section 6 of BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
skipping to change at page 1, line 37 skipping to change at page 1, line 37
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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This Internet-Draft will expire on July 27, 2007. This Internet-Draft will expire on September 5, 2007.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2007).
Abstract Abstract
Wireless LAN product architectures have evolved from single Wireless LAN product architectures have evolved from single
autonomous access points to systems consisting of a centralized autonomous access points to systems consisting of a centralized
Access Controller (AC) and Wireless Termination Points (WTPs). The Access Controller (AC) and Wireless Termination Points (WTPs). The
general goal of centralized control architectures is to move access general goal of centralized control architectures is to move access
control, including user authentication and authorization, mobility control, including user authentication and authorization, mobility
management and radio management from the single access point to a management and radio management from the single access point to a
centralized controller. centralized controller.
This specification defines the Control And Provisioning of Wireless This specification defines the Control And Provisioning of Wireless
Access Points (CAPWAP) Protocol Binding Specification for use with Access Points (CAPWAP) Protocol Binding Specification for use with
the IEEE 802.11 Wireless Local Area Network (WLAN) protocol. The the IEEE 802.11 Wireless Local Area Network protocol. The CAPWAP
CAPWAP Protocol Specification is defined separately [1]. Protocol Specification is defined separately [1].
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Goals . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Goals . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Conventions used in this document . . . . . . . . . . . . 4 1.2. Conventions used in this document . . . . . . . . . . . . 4
1.3. Contributing Authors . . . . . . . . . . . . . . . . . . . 4 1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
1.4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . 4
1.5. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. IEEE 802.11 Binding . . . . . . . . . . . . . . . . . . . . . 6 2. IEEE 802.11 Binding . . . . . . . . . . . . . . . . . . . . . 6
2.1. Split MAC and Local MAC Functionality . . . . . . . . . . 6 2.1. Split MAC and Local MAC Functionality . . . . . . . . . . 6
2.1.1. Split MAC . . . . . . . . . . . . . . . . . . . . . . 6 2.1.1. Split MAC . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2. Local MAC . . . . . . . . . . . . . . . . . . . . . . 9 2.1.2. Local MAC . . . . . . . . . . . . . . . . . . . . . . 9
2.2. Roaming Behavior . . . . . . . . . . . . . . . . . . . . . 12 2.2. Roaming Behavior . . . . . . . . . . . . . . . . . . . . . 12
2.3. Group Key Refresh . . . . . . . . . . . . . . . . . . . . 13 2.3. Group Key Refresh . . . . . . . . . . . . . . . . . . . . 13
2.4. BSSID to WLAN ID Mapping . . . . . . . . . . . . . . . . . 14 2.4. BSSID to WLAN ID Mapping . . . . . . . . . . . . . . . . . 14
2.5. Quality of Service for IEEE 802.11 MAC Management 2.5. Quality of Service for IEEE 802.11 MAC Management
Messages . . . . . . . . . . . . . . . . . . . . . . . . . 14 Messages . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.6. Run State Operation . . . . . . . . . . . . . . . . . . . 14 2.6. Run State Operation . . . . . . . . . . . . . . . . . . . 14
3. IEEE 802.11 Specific CAPWAP Control Messages . . . . . . . . . 15 3. IEEE 802.11 Specific CAPWAP Control Messages . . . . . . . . . 15
3.1. IEEE 802.11 WLAN Configuration Request . . . . . . . . . . 15 3.1. IEEE 802.11 WLAN Configuration Request . . . . . . . . . . 15
3.2. IEEE 802.11 WLAN Configuration Response . . . . . . . . . 16 3.2. IEEE 802.11 WLAN Configuration Response . . . . . . . . . 16
4. CAPWAP Data Message Bindings . . . . . . . . . . . . . . . . . 17 4. CAPWAP Data Message Bindings . . . . . . . . . . . . . . . . . 17
5. CAPWAP Control Message bindings . . . . . . . . . . . . . . . 19 5. CAPWAP Control Message bindings . . . . . . . . . . . . . . . 19
5.1. Discovery Request Message . . . . . . . . . . . . . . . . 19 5.1. Discovery Request Message . . . . . . . . . . . . . . . . 19
5.2. Primary Discovery Request Message . . . . . . . . . . . . 19 5.2. Discovery Response Message . . . . . . . . . . . . . . . . 19
5.3. Join Request Request Message . . . . . . . . . . . . . . . 19 5.3. Primary Discovery Request Message . . . . . . . . . . . . 19
5.4. Configuration Status Message . . . . . . . . . . . . . . . 19 5.4. Primary Discovery Response Message . . . . . . . . . . . . 19
5.5. Configuration Status Response Message . . . . . . . . . . 20 5.5. Join Request Message . . . . . . . . . . . . . . . . . . . 19
5.6. Configuration Update Request Message . . . . . . . . . . . 20 5.6. Join Response Message . . . . . . . . . . . . . . . . . . 20
5.7. Station Configuration Request . . . . . . . . . . . . . . 21 5.7. Configuration Status Message . . . . . . . . . . . . . . . 20
5.8. WTP Event Request . . . . . . . . . . . . . . . . . . . . 21 5.8. Configuration Status Response Message . . . . . . . . . . 20
6. IEEE 802.11 Message Element Definitions . . . . . . . . . . . 22 5.9. Configuration Update Request Message . . . . . . . . . . . 21
6.1. IEEE 802.11 Add WLAN . . . . . . . . . . . . . . . . . . . 22 5.10. Station Configuration Request . . . . . . . . . . . . . . 22
6.2. IEEE 802.11 Antenna . . . . . . . . . . . . . . . . . . . 26 5.11. Change State Event Request . . . . . . . . . . . . . . . . 22
6.3. IEEE 802.11 Assigned WTP BSSID . . . . . . . . . . . . . . 27 5.12. WTP Event Request . . . . . . . . . . . . . . . . . . . . 22
6.4. IEEE 802.11 Delete WLAN . . . . . . . . . . . . . . . . . 28 6. IEEE 802.11 Message Element Definitions . . . . . . . . . . . 23
6.5. IEEE 802.11 Direct Sequence Control . . . . . . . . . . . 28 6.1. IEEE 802.11 Add WLAN . . . . . . . . . . . . . . . . . . . 23
6.6. IEEE 802.11 Information Element . . . . . . . . . . . . . 29 6.2. IEEE 802.11 Antenna . . . . . . . . . . . . . . . . . . . 27
6.7. IEEE 802.11 MAC Operation . . . . . . . . . . . . . . . . 30 6.3. IEEE 802.11 Assigned WTP BSSID . . . . . . . . . . . . . . 28
6.8. IEEE 802.11 MIC Countermeasures . . . . . . . . . . . . . 32 6.4. IEEE 802.11 Delete WLAN . . . . . . . . . . . . . . . . . 29
6.9. IEEE 802.11 Multi-Domain Capability . . . . . . . . . . . 32 6.5. IEEE 802.11 Direct Sequence Control . . . . . . . . . . . 29
6.10. IEEE 802.11 OFDM Control . . . . . . . . . . . . . . . . . 33 6.6. IEEE 802.11 Information Element . . . . . . . . . . . . . 30
6.11. IEEE 802.11 Rate Set . . . . . . . . . . . . . . . . . . . 34 6.7. IEEE 802.11 MAC Operation . . . . . . . . . . . . . . . . 31
6.12. IEEE 802.11 RSNA Error Report From Station . . . . . . . . 35 6.8. IEEE 802.11 MIC Countermeasures . . . . . . . . . . . . . 33
6.13. IEEE 802.11 Station . . . . . . . . . . . . . . . . . . . 37 6.9. IEEE 802.11 Multi-Domain Capability . . . . . . . . . . . 33
6.14. IEEE 802.11 Station QoS Profile . . . . . . . . . . . . . 38 6.10. IEEE 802.11 OFDM Control . . . . . . . . . . . . . . . . . 34
6.15. IEEE 802.11 Station Session Key . . . . . . . . . . . . . 38 6.11. IEEE 802.11 Rate Set . . . . . . . . . . . . . . . . . . . 35
6.16. IEEE 802.11 Statistics . . . . . . . . . . . . . . . . . . 40 6.12. IEEE 802.11 RSNA Error Report From Station . . . . . . . . 36
6.17. IEEE 802.11 Supported Rates . . . . . . . . . . . . . . . 44 6.13. IEEE 802.11 Station . . . . . . . . . . . . . . . . . . . 38
6.18. IEEE 802.11 Tx Power . . . . . . . . . . . . . . . . . . . 44 6.14. IEEE 802.11 Station QoS Profile . . . . . . . . . . . . . 39
6.19. IEEE 802.11 Tx Power Level . . . . . . . . . . . . . . . . 45 6.15. IEEE 802.11 Station Session Key . . . . . . . . . . . . . 39
6.20. IEEE 802.11 Update Station QoS . . . . . . . . . . . . . . 45 6.16. IEEE 802.11 Statistics . . . . . . . . . . . . . . . . . . 41
6.21. IEEE 802.11 Update WLAN . . . . . . . . . . . . . . . . . 46 6.17. IEEE 802.11 Supported Rates . . . . . . . . . . . . . . . 45
6.22. IEEE 802.11 WTP Quality of Service . . . . . . . . . . . . 48 6.18. IEEE 802.11 Tx Power . . . . . . . . . . . . . . . . . . . 45
6.23. IEEE 802.11 WTP Radio Configuration . . . . . . . . . . . 49 6.19. IEEE 802.11 Tx Power Level . . . . . . . . . . . . . . . . 46
6.24. IEEE 802.11 WTP Radio Fail Alarm Indication . . . . . . . 51 6.20. IEEE 802.11 Update Station QoS . . . . . . . . . . . . . . 46
6.25. IEEE 802.11 WTP Radio Information . . . . . . . . . . . . 51 6.21. IEEE 802.11 Update WLAN . . . . . . . . . . . . . . . . . 47
7. IEEE 802.11 Binding WTP Saved Variables . . . . . . . . . . . 53 6.22. IEEE 802.11 WTP Quality of Service . . . . . . . . . . . . 49
7.1. IEEE80211AntennaInfo . . . . . . . . . . . . . . . . . . . 53 6.23. IEEE 802.11 WTP Radio Configuration . . . . . . . . . . . 50
7.2. IEEE80211DSControl . . . . . . . . . . . . . . . . . . . . 53 6.24. IEEE 802.11 WTP Radio Fail Alarm Indication . . . . . . . 52
7.3. IEEE80211MACOperation . . . . . . . . . . . . . . . . . . 53 6.25. IEEE 802.11 WTP Radio Information . . . . . . . . . . . . 52
7.4. IEEE80211OFDMControl . . . . . . . . . . . . . . . . . . . 53 7. IEEE 802.11 Binding WTP Saved Variables . . . . . . . . . . . 54
7.5. IEEE80211Rateset . . . . . . . . . . . . . . . . . . . . . 53 7.1. IEEE80211AntennaInfo . . . . . . . . . . . . . . . . . . . 54
7.6. IEEE80211TxPower . . . . . . . . . . . . . . . . . . . . . 53 7.2. IEEE80211DSControl . . . . . . . . . . . . . . . . . . . . 54
7.7. IEEE80211QoS . . . . . . . . . . . . . . . . . . . . . . . 53 7.3. IEEE80211MACOperation . . . . . . . . . . . . . . . . . . 54
7.8. IEEE80211RadioConfig . . . . . . . . . . . . . . . . . . . 53 7.4. IEEE80211OFDMControl . . . . . . . . . . . . . . . . . . . 54
8. Technology Specific Message Element Values . . . . . . . . . . 54 7.5. IEEE80211Rateset . . . . . . . . . . . . . . . . . . . . . 54
9. Security Considerations . . . . . . . . . . . . . . . . . . . 55 7.6. IEEE80211TxPower . . . . . . . . . . . . . . . . . . . . . 54
9.1. IEEE 802.11 Security . . . . . . . . . . . . . . . . . . . 55 7.7. IEEE80211QoS . . . . . . . . . . . . . . . . . . . . . . . 54
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 57 7.8. IEEE80211RadioConfig . . . . . . . . . . . . . . . . . . . 54
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 58 8. Technology Specific Message Element Values . . . . . . . . . . 55
11.1. Normative References . . . . . . . . . . . . . . . . . . . 58 9. Security Considerations . . . . . . . . . . . . . . . . . . . 56
11.2. Informational References . . . . . . . . . . . . . . . . . 59 9.1. IEEE 802.11 Security . . . . . . . . . . . . . . . . . . . 56
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 60 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 58
Intellectual Property and Copyright Statements . . . . . . . . . . 61 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 59
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 60
12.1. Normative References . . . . . . . . . . . . . . . . . . . 60
12.2. Informational References . . . . . . . . . . . . . . . . . 61
Editors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 62
Intellectual Property and Copyright Statements . . . . . . . . . . 63
1. Introduction 1. Introduction
This specification defines the Control And Provisioning of Wireless This specification defines the Control And Provisioning of Wireless
Access Points (CAPWAP) Protocol Binding Specification for use with Access Points (CAPWAP) Protocol Binding Specification for use with
the IEEE 802.11 Wireless Local Area Network (WLAN) protocol. Use of the IEEE 802.11 Wireless Local Area Network protocol. Use of CAPWAP
CAPWAP control message fields, new control messages and message control message fields, new control messages and message elements are
elements are defined. The minimum required definitions for a defined. The minimum required definitions for a binding-specific
binding-specific Statistics message element, Station message element, Statistics message element, Station message element, and WTP Radio
and WTP Radio Information message element are included. Information message element are included.
1.1. Goals 1.1. Goals
The goals for this CAPWAP protocol binding are listed below: The goals for this CAPWAP protocol binding are listed below:
1. To centralize the authentication and policy enforcement functions 1. To centralize the authentication and policy enforcement functions
for an IEEE 802.11 wireless network. The AC may also provide for an IEEE 802.11 wireless network. The AC may also provide
centralized bridging, forwarding, and encryption of user traffic. centralized bridging, forwarding, and encryption of user traffic.
Centralization of these functions will enable reduced cost and Centralization of these functions will enable reduced cost and
higher efficiency by applying the capabilities of network higher efficiency by applying the capabilities of network
processing silicon to the wireless network, as in wired LANs. processing silicon to the wireless network, as in wired LANs.
2. To enable shifting of the higher level protocol processing from 2. To enable shifting of the higher level protocol processing from
the WTP. This leaves the time critical applications of wireless the WTP. This leaves the time-critical applications of wireless
control and access in the WTP, making efficient use of the control and access in the WTP, making efficient use of the
computing power available in WTPs which are the subject to severe computing power available in WTPs which are subject to severe cost
cost pressure. pressure.
The CAPWAP protocol binding extensions defined herein apply solely to The CAPWAP protocol binding extensions defined herein apply solely to
the interface between the WTP and the AC. Inter-AC, or station to AC the interface between the WTP and the AC. Inter-AC and station-to-AC
communication is strictly outside the scope of this document. communication are strictly outside the scope of this document.
1.2. Conventions used in this document 1.2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [2]. document are to be interpreted as described in RFC 2119 [2].
1.3. Contributing Authors 1.3. Terminology
TBD
1.4. Acknowledgements
TBD
1.5. Terminology
Access Controller (AC): The network entity that provides WTP access Access Controller (AC): The network entity that provides WTP access
to the network infrastructure in the data plane, control plane, to the network infrastructure in the data plane, control plane,
management plane, or a combination therein. management plane, or a combination therein.
Basic Service Set (BSS): A set of stations controlled by a single Basic Service Set (BSS): A set of stations controlled by a single
coordination function. coordination function.
Distribution: The service that, by using association information, Distribution: The service that, by using association information,
delivers medium access control (MAC) service data units (MSDUs) delivers medium access control (MAC) service data units (MSDUs)
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Station (STA): A device that contains an IEEE 802.11 conformant Station (STA): A device that contains an IEEE 802.11 conformant
medium access control (MAC) and physical layer (PHY) interface to the medium access control (MAC) and physical layer (PHY) interface to the
wireless medium (WM). wireless medium (WM).
Portal: The logical point at which medium access control (MAC) Portal: The logical point at which medium access control (MAC)
service data units (MSDUs) from a non-IEEE 802.11 local area network service data units (MSDUs) from a non-IEEE 802.11 local area network
(LAN) enter the distribution system (DS) of an extended service set (LAN) enter the distribution system (DS) of an extended service set
(ESS). (ESS).
WLAN: In this document, WLAN refers to a logical component
instantiated on a WTP device. A single physical WTP may operate a
number of WLANs. Each Basic Service Set Identifier (BSSID) and its
constituent wireless terminal radios is denoted as a distinct WLAN on
a physical WTP.
Wireless Termination Point (WTP): The physical or network entity that Wireless Termination Point (WTP): The physical or network entity that
contains an IEEE 802.11 RF antenna and wireless PHY to transmit and contains an IEEE 802.11 RF antenna and wireless PHY to transmit and
receive station traffic for wireless access networks. receive station traffic for wireless access networks.
2. IEEE 802.11 Binding 2. IEEE 802.11 Binding
This section describes use of the CAPWAP protocol with IEEE 802.11 This section describes use of the CAPWAP protocol with the IEEE
WLANs, including Local and Split MAC operation, Group Key Refresh, 802.11 Wireless Local Area Network protocol, including Local and
BSSID to WLAN Mapping, IEEE 802.11 MAC management frame Quality of Split MAC operation, Group Key Refresh, BSSID to WLAN Mapping, IEEE
Service tagging and Run State operation. 802.11 MAC management frame Quality of Service tagging and Run State
operation.
2.1. Split MAC and Local MAC Functionality 2.1. Split MAC and Local MAC Functionality
The CAPWAP protocol, when used with IEEE 802.11 devices, requires The CAPWAP protocol, when used with IEEE 802.11 devices, requires
specific behavior from the WTP and the AC, to support the required specific behavior from the WTP and the AC to support the required
IEEE 802.11 protocol functions. IEEE 802.11 protocol functions.
For both the Split and Local MAC approaches, the CAPWAP functions, as For both the Split and Local MAC approaches, the CAPWAP functions, as
defined in the taxonomy specification [7], reside in the AC. defined in the taxonomy specification [7], reside in the AC.
To provide system component interoperability, the WTP MUST support This is a placeholder for the resolution of issue 138 once agreement
802.11 encryption/decryption at the WTP and the WTP MUST support has been reached in the working group.
802.11 encryption/decryption at the AC. The AC MUST support either
(a) 802.11 encryption/decryption at the WTP or (b) 802.11 encryption/
decryption at the AC. The AC MAY support both 802.11 encryption/
decryption at the WTP and 802.11 encryption/decryption at the AC.
2.1.1. Split MAC 2.1.1. Split MAC
This section shows the division of labor between the WTP and the AC This section shows the division of labor between the WTP and the AC
in a Split MAC architecture. Figure 1 shows the separation of in a Split MAC architecture. Figure 1 shows the separation of
functionality between CAPWAP components. functionality between CAPWAP components.
Function Location Function Location
Distribution Service AC Distribution Service AC
Integration Service AC Integration Service AC
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All remaining IEEE 802.11 MAC management frames are supported on the All remaining IEEE 802.11 MAC management frames are supported on the
AC, including the Association Request frame which allows the AC to be AC, including the Association Request frame which allows the AC to be
involved in the access policy enforcement portion of the IEEE 802.11 involved in the access policy enforcement portion of the IEEE 802.11
protocol. The IEEE 802.1X and IEEE 802.11 key management function protocol. The IEEE 802.1X and IEEE 802.11 key management function
are also located on the AC. This implies that the AAA client also are also located on the AC. This implies that the AAA client also
resides on the AC. resides on the AC.
While the admission control component of IEEE 802.11 resides on the While the admission control component of IEEE 802.11 resides on the
AC, the real time scheduling and queuing functions are on the WTP. AC, the real time scheduling and queuing functions are on the WTP.
Note this does not exclude the AC from providing additional policy Note that this does not prevent the AC from providing additional
and scheduling functionality. policy and scheduling functionality.
Note that in the following figure, the use of '( - )' indicates that Note that in the following figure, the use of '( - )' indicates that
processing of the frames is done on the WTP. processing of the frames is done on the WTP.
Client WTP AC Client WTP AC
Beacon Beacon
<----------------------------- <-----------------------------
Probe Request Probe Request
----------------------------( - )-------------------------> ----------------------------( - )------------------------->
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o The WTP processes the probe request frame and responds with a o The WTP processes the probe request frame and responds with a
corresponding probe response frame. The probe request frame is corresponding probe response frame. The probe request frame is
then forwarded to the AC for optional processing. then forwarded to the AC for optional processing.
o The WTP forwards the IEEEE 802.11 Authentication and Association o The WTP forwards the IEEEE 802.11 Authentication and Association
frames to the AC, which is responsible for responding to the frames to the AC, which is responsible for responding to the
client. client.
o Once the association is complete, the AC transmits a Station o Once the association is complete, the AC transmits a Station
Configuration Request message, which includes an Add Station Configuration Request message, which includes an Add Station
message element, to the WTP (see Section 4.4.8 in [1]). In the message element, to the WTP (see Section 4.5.8 in [1]). In the
above example, the WLAN was configured for IEEE 802.1X. above example, the WLAN was configured for IEEE 802.1X.
o If the WTP is providing encryption/decryption services, once the o If the WTP is providing encryption/decryption services, once the
client has completed the IEEE 802.11 key exchange, the AC client has completed the IEEE 802.11 key exchange, the AC
transmits another Station Configuration Request message which transmits another Station Configuration Request message which
includes an Add Station message element, an IEEE 802.11 Station includes an Add Station message element, an IEEE 802.11 Station
message element, an IEEE 802.11 Station Session Key message message element, an IEEE 802.11 Station Session Key message
element and an IEEE 802.11 Information Element message element element and an IEEE 802.11 Information Element message element
which includes the RSNIE to the WTP, delivering the security which includes the RSNIE to the WTP, delivering the security
policy to enforce for the station (in this case AES-CCMP), and the policy to enforce for the station (in this case AES-CCMP), and the
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frames from the AC, the WTP is responsible for adding the FCS field, frames from the AC, the WTP is responsible for adding the FCS field,
and populating the field as described in [3]. and populating the field as described in [3].
2.1.2. Local MAC 2.1.2. Local MAC
This section shows the division of labor between the WTP and the AC This section shows the division of labor between the WTP and the AC
in a Local MAC architecture. Figure 4 shows the separation of in a Local MAC architecture. Figure 4 shows the separation of
functionality among CAPWAP components. functionality among CAPWAP components.
Function Location Function Location
Distribution Service WTP Distribution Service WTP/AC
Integration Service WTP Integration Service WTP
Beacon Generation WTP Beacon Generation WTP
Probe Response Generation WTP Probe Response Generation WTP
Power Mgmt/Packet Buffering WTP Power Mgmt/Packet Buffering WTP
Fragmentation/Defragmentation WTP Fragmentation/Defragmentation WTP
Assoc/Disassoc/Reassoc WTP Assoc/Disassoc/Reassoc WTP/AC
IEEE 802.11 QOS IEEE 802.11 QOS
Classifying WTP Classifying WTP
Scheduling WTP Scheduling WTP
Queuing WTP Queuing WTP
IEEE 802.11 RSN IEEE 802.11 RSN
IEEE 802.1X/EAP AC IEEE 802.1X/EAP AC
RSNA Key Management AC RSNA Key Management AC
IEEE 802.11 Encryption/Decryption WTP IEEE 802.11 Encryption/Decryption WTP
skipping to change at page 11, line 29 skipping to change at page 11, line 29
802.11 Action Frames 802.11 Action Frames
<---------------------------------------------------------> <--------------------------------------------------------->
Station Configuration Request[Add Station (AES-CCMP, PTK=x)] Station Configuration Request[Add Station (AES-CCMP, PTK=x)]
<-------------------------> <------------------------->
802.11 DATA 802.11 DATA
<-----------------------------> <----------------------------->
Figure 5: Local MAC Message Flow Figure 5: Local MAC Message Flow
Figure 5 provides an illustration of the division of labor in a Local Figure 5 provides an illustration of the division of labor in a Local
MAC architecture. In this example, a WLAN has been created that is MAC architecture. In this example, a WLAN that is configured for
configured for IEEE 802.11, using AES-CCMP for privacy. The IEEE 802.11 has been created using AES-CCMP for privacy. The
following process occurs: following process occurs:
o The WTP generates the IEEE 802.11 beacon frames, using information o The WTP generates the IEEE 802.11 beacon frames, using information
provided to it through the Add WLAN (see Section 6.1) message provided to it through the Add WLAN (see Section 6.1) message
element. element.
o The WTP processes a probe request frame and responds with a o The WTP processes a probe request frame and responds with a
corresponding probe response frame. corresponding probe response frame.
o The WTP forwards the IEEE 802.11 Authentication and Association o The WTP forwards the IEEE 802.11 Authentication and Association
skipping to change at page 15, line 10 skipping to change at page 15, line 10
When the AC sends a WLAN Configuration Request message (see When the AC sends a WLAN Configuration Request message (see
Section 3.1) or receives the corresponding WLAN Configuration Section 3.1) or receives the corresponding WLAN Configuration
Response message (see Section 3.2) from the WTP, it remains in the Response message (see Section 3.2) from the WTP, it remains in the
Run state. Run state.
3. IEEE 802.11 Specific CAPWAP Control Messages 3. IEEE 802.11 Specific CAPWAP Control Messages
This section defines CAPWAP Control Messages that are specific to the This section defines CAPWAP Control Messages that are specific to the
IEEE 802.11 binding. Two messages are defined, IEEE 802.11 WLAN IEEE 802.11 binding. Two messages are defined, IEEE 802.11 WLAN
Configuration Request and IEEE 802.11 WLAN Configuration Response. Configuration Request and IEEE 802.11 WLAN Configuration Response.
See Section 4.3 in [1] for CAPWAP Control message definitions and the See Section 4.4 in [1] for CAPWAP Control message definitions and the
derivation of the Message Type value from the IANA Enterprise number. derivation of the Message Type value from the IANA Enterprise number.
The valid message types for IEEE 802.11 specific control messages are The valid message types for IEEE 802.11 specific control messages are
listed below. The IANA Enterprise number used with these messages is listed below. The IANA Enterprise number used with these messages is
13277. 13277.
CAPWAP Control Message Message Type CAPWAP Control Message Message Type
Value Value
IEEE 802.11 WLAN Configuration Request 3398912 IEEE 802.11 WLAN Configuration Request 3398912
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3.1. IEEE 802.11 WLAN Configuration Request 3.1. IEEE 802.11 WLAN Configuration Request
The IEEE 802.11 WLAN Configuration Request is sent by the AC to the The IEEE 802.11 WLAN Configuration Request is sent by the AC to the
WTP in order to change services provided by the WTP. This control WTP in order to change services provided by the WTP. This control
message is used to either create, update or delete a WLAN on the WTP. message is used to either create, update or delete a WLAN on the WTP.
The IEEE 802.11 WLAN Configuration Request is sent as a result of The IEEE 802.11 WLAN Configuration Request is sent as a result of
either some manual admistrative process (e.g., deleting a WLAN), or either some manual admistrative process (e.g., deleting a WLAN), or
automatically to create a WLAN on a WTP. When sent automatically to automatically to create a WLAN on a WTP. When sent automatically to
create a WLAN, this control message is sent after the CAPWAP create a WLAN, this control message is sent after the CAPWAP
Configuration Update Request message (see Section 4.3 in [1]) has Configuration Update Request message (see Section 8.5 in [1]) has
been received by the WTP. been received by the WTP.
Upon receiving this control message, the WTP will modify the Upon receiving this control message, the WTP will modify the
necessary services, and transmit an IEEE 802.11 WLAN Configuration necessary services, and transmit an IEEE 802.11 WLAN Configuration
Response. Response.
A WTP MAY provide service for more than one WLAN, therefore every A WTP MAY provide service for more than one WLAN, therefore every
WLAN is identified through a numerical index. For instance, a WTP WLAN is identified through a numerical index. For instance, a WTP
that is capable of supporting up to 16 SSIDs, could accept up to 16 that is capable of supporting up to 16 SSIDs, could accept up to 16
IEEE 802.11 WLAN Configuration Request messages that include the Add IEEE 802.11 WLAN Configuration Request messages that include the Add
WLAN message element. WLAN message element.
Since the index is the primary identifier for a WLAN, an AC MAY Since the index is the primary identifier for a WLAN, an AC MAY
attempt to ensure that the same WLAN is identified through the same attempt to ensure that the same WLAN is identified through the same
index number on all of its WTPs. An AC that does not follow this index number on all of its WTPs. An AC that does not follow this
approach MUST find some other means of maintaining a WLAN Identifier approach MUST find some other means of maintaining a WLAN-Identifier-
to SSID mapping table. to-SSID mapping table.
The following message elements may be included in the IEEE 802.11 The following message elements may be included in the IEEE 802.11
WLAN Configuration Request message. Only one message element MUST be WLAN Configuration Request message. Only one message element MUST be
present. present.
o IEEE 802.11 Add WLAN, see Section 6.1 o IEEE 802.11 Add WLAN, see Section 6.1
o IEEE 802.11 Delete WLAN, see Section 6.4 o IEEE 802.11 Delete WLAN, see Section 6.4
o IEEE 802.11 Update WLAN, see Section 6.21 o IEEE 802.11 Update WLAN, see Section 6.21
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Request message occurred on the WTP. Request message occurred on the WTP.
The following message element MAY be included in the IEEE 802.11 WLAN The following message element MAY be included in the IEEE 802.11 WLAN
Configuration Response message. Configuration Response message.
o IEEE 802.11 Assigned WTP BSSID, see Section 6.3 o IEEE 802.11 Assigned WTP BSSID, see Section 6.3
The following message element MUST be included in the IEEE 802.11 The following message element MUST be included in the IEEE 802.11
WLAN Configuration Response message. WLAN Configuration Response message.
o Result Code, see Section 4.4.31 in [1] o Result Code, see Section 4.5.31 in [1]
4. CAPWAP Data Message Bindings 4. CAPWAP Data Message Bindings
This section describes the CAPWAP Data Message bindings to support This section describes the CAPWAP Data Message bindings to support
transport of IEEE 802.11 frames. transport of IEEE 802.11 frames.
Payload encapsulation: The CAPWAP protocol defines the CAPWAP data Payload encapsulation: The CAPWAP protocol defines the CAPWAP data
message, which is used to encapsulate a wireless payload. For message, which is used to encapsulate a wireless payload. For
IEEE 802.11, the IEEE 802.11 header and payload are encapsulated IEEE 802.11, the IEEE 802.11 header and payload are encapsulated
(excluding the IEEE 802.11 FCS checksum). The IEEE 802.11 FCS (excluding the IEEE 802.11 FCS checksum). The IEEE 802.11 FCS
checksum is handled by the WTP. This allows the WTP to validate checksum is handled by the WTP. This allows the WTP to validate
an IEEE 802.11 frame prior to sending it to the AC. Similarly, an IEEE 802.11 frame prior to sending it to the AC. Similarly,
when an AC wishes to transmit a frame to a station, the WTP when an AC wishes to transmit a frame to a station, the WTP
computes and adds the FCS checksum. computes and adds the FCS checksum.
Optional Wireless Specific Information: The optional CAPWAP header Optional Wireless Specific Information: The optional CAPWAP header
field (see Section 4.1 in [1]) is only used with CAPWAP data field (see Section 4.2 in [1]) is only used with CAPWAP data
messages, and it serves two purposes, depending upon the direction messages, and it serves two purposes, depending upon the direction
of the message. For messages from the WTP to the AC, the field of the message. For messages from the WTP to the AC, the field
uses the format described in the "IEEE 802.11 Frame Info" field uses the format described in the "IEEE 802.11 Frame Info" field
(see below). However, for messages sent by the AC to the WTP, the (see below). However, for messages sent by the AC to the WTP, the
format used is described in the "Destination WLANs" field (also format used is described in the "Destination WLANs" field (also
defined below). defined below).
IEEE 802.11 Frame Info: When an IEEE 802.11 frame is received from a IEEE 802.11 Frame Info: When an IEEE 802.11 frame is received from a
station over the air, it is encapsulated and this field is used to station over the air, it is encapsulated and this field is used to
include radio and PHY specific information associated with the include radio and PHY specific information associated with the
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5.1. Discovery Request Message 5.1. Discovery Request Message
The following IEEE 802.11 specific message element MUST be included The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Discovery Request Message. in the CAPWAP Discovery Request Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for 802.11 WTP Radio Information message element MUST be present for
every radio in the WTP. every radio in the WTP.
5.2. Primary Discovery Request Message 5.2. Discovery Response Message
The following IEEE 802.11 specific message element MUST be included The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Primary Discovery Request Message. in the CAPWAP Discovery Response Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for 802.11 WTP Radio Information message element MUST be present for
every radio in the WTP. every radio in the WTP.
5.3. Join Request Request Message 5.3. Primary Discovery Request Message
The following IEEE 802.11 specific message element MUST be included The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Primary Discovery Request Message. in the CAPWAP Primary Discovery Request Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for 802.11 WTP Radio Information message element MUST be present for
every radio in the WTP. every radio in the WTP.
5.4. Configuration Status Message 5.4. Primary Discovery Response Message
The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Primary Discovery Response Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for
every radio in the WTP.
5.5. Join Request Message
The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Join Request Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for
every radio in the WTP.
5.6. Join Response Message
The following IEEE 802.11 specific message element MUST be included
in the CAPWAP Join Response Message.
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for
every radio in the WTP.
5.7. Configuration Status Message
The following IEEE 802.11 specific message elements may be included The following IEEE 802.11 specific message elements may be included
in the CAPWAP Configuration Status Message. in the CAPWAP Configuration Status Message. More than one of each
message element listed may be included.
o IEEE 802.11 Antenna, see Section 6.2 o IEEE 802.11 Antenna, see Section 6.2
o IEEE 802.11 Direct Sequence Control, see Section 6.5 o IEEE 802.11 Direct Sequence Control, see Section 6.5
o IEEE 802.11 MAC Operation, see Section 6.7 o IEEE 802.11 MAC Operation, see Section 6.7
o IEEE 802.11 Multi Domain Capability, see Section 6.9 o IEEE 802.11 Multi Domain Capability, see Section 6.9
o IEEE 802.11 OFDM Control, see Section 6.10 o IEEE 802.11 OFDM Control, see Section 6.10
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o IEEE 802.11 Tx Power, see Section 6.18 o IEEE 802.11 Tx Power, see Section 6.18
o IEEE 802.11 TX Power Level, see Section 6.19 o IEEE 802.11 TX Power Level, see Section 6.19
o IEEE 802.11 WTP Radio Configuration, see Section 6.23 o IEEE 802.11 WTP Radio Configuration, see Section 6.23
o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE o IEEE 802.11 WTP Radio Information, see Section 6.25. An IEEE
802.11 WTP Radio Information message element MUST be present for 802.11 WTP Radio Information message element MUST be present for
every radio in the WTP. every radio in the WTP.
5.5. Configuration Status Response Message 5.8. Configuration Status Response Message
The following IEEE 802.11 specific message elements may be included The following IEEE 802.11 specific message elements may be included
in the CAPWAP Configuration Status Response Message. in the CAPWAP Configuration Status Response Message. More than one
of each message element listed may be included.
o IEEE 802.11 Antenna, see Section 6.2 o IEEE 802.11 Antenna, see Section 6.2
o IEEE 802.11 Direct Sequence Control, see Section 6.5 o IEEE 802.11 Direct Sequence Control, see Section 6.5
o IEEE 802.11 MAC Operation, see Section 6.7 o IEEE 802.11 MAC Operation, see Section 6.7
o IEEE 802.11 Multi Domain Capability, see Section 6.9 o IEEE 802.11 Multi Domain Capability, see Section 6.9
o IEEE 802.11 OFDM Control, see Section 6.10 o IEEE 802.11 OFDM Control, see Section 6.10
o IEEE 802.11 Rate Set, see Section 6.11 o IEEE 802.11 Rate Set, see Section 6.11
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o IEEE 802.11 Rate Set, see Section 6.11 o IEEE 802.11 Rate Set, see Section 6.11
o IEEE 802.11 Supported Rates, see Section 6.17 o IEEE 802.11 Supported Rates, see Section 6.17
o IEEE 802.11 Tx Power, see Section 6.18 o IEEE 802.11 Tx Power, see Section 6.18
o IEEE 802.11 WTP Quality of Service, see Section 6.22 o IEEE 802.11 WTP Quality of Service, see Section 6.22
o IEEE 802.11 WTP Radio Configuration, see Section 6.23 o IEEE 802.11 WTP Radio Configuration, see Section 6.23
5.6. Configuration Update Request Message 5.9. Configuration Update Request Message
The following IEEE 802.11 specific message elements may be included The following IEEE 802.11 specific message elements may be included
in the CAPWAP Configuration Update Request Message. in the CAPWAP Configuration Update Request Message. More than one of
each message element listed may be included.
o IEEE 802.11 Antenna, see Section 6.2 o IEEE 802.11 Antenna, see Section 6.2
o IEEE 802.11 Direct Sequence Control, see Section 6.5 o IEEE 802.11 Direct Sequence Control, see Section 6.5
o IEEE 802.11 MAC Operation, see Section 6.7 o IEEE 802.11 MAC Operation, see Section 6.7
o IEEE 802.11 Multi Domain Capability, see Section 6.9 o IEEE 802.11 Multi Domain Capability, see Section 6.9
o IEEE 802.11 OFDM Control, see Section 6.10 o IEEE 802.11 OFDM Control, see Section 6.10
o IEEE 802.11 Rate Set, see Section 6.11 o IEEE 802.11 Rate Set, see Section 6.11
o IEEE 802.11 RSNA Error Report From Station, see Section 6.12 o IEEE 802.11 RSNA Error Report From Station, see Section 6.12
o IEEE 802.11 Tx Power, see Section 6.18 o IEEE 802.11 Tx Power, see Section 6.18
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o IEEE 802.11 Rate Set, see Section 6.11 o IEEE 802.11 Rate Set, see Section 6.11
o IEEE 802.11 RSNA Error Report From Station, see Section 6.12 o IEEE 802.11 RSNA Error Report From Station, see Section 6.12
o IEEE 802.11 Tx Power, see Section 6.18 o IEEE 802.11 Tx Power, see Section 6.18
o IEEE 802.11 WTP Quality of Service, see Section 6.22 o IEEE 802.11 WTP Quality of Service, see Section 6.22
o IEEE 802.11 WTP Radio Configuration, see Section 6.23 o IEEE 802.11 WTP Radio Configuration, see Section 6.23
5.7. Station Configuration Request 5.10. Station Configuration Request
The following IEEE 802.11 specific message elements MAY included in The following IEEE 802.11 specific message elements MAY included in
the CAPWAP Station Configuration Request message. the CAPWAP Station Configuration Request message. More than one of
each message element listed may be included.
o IEEE 802.11 Station, see Section 6.13 o IEEE 802.11 Station, see Section 6.13
o IEEE 802.11 Station Session Key, see Section 6.15 o IEEE 802.11 Station Session Key, see Section 6.15
o Station QoS Profile, see Section 6.14 o Station QoS Profile, see Section 6.14
5.8. WTP Event Request 5.11. Change State Event Request
The following IEEE 802.11 specific message elements may be included The following IEEE 802.11 specific message elements MAY included in
in the CAPWAP WTP Event Request message. the CAPWAP Station Configuration Request message.
o IEEE 802.11 WTP Radio Fail Alarm Indication, see Section 6.24
5.12. WTP Event Request
The following IEEE 802.11 specific message elements MAY be included
in the CAPWAP WTP Event Request message.More than one of each message
element listed may be included.
o IEEE 802.11 MIC Countermeasures, see Section 6.8 o IEEE 802.11 MIC Countermeasures, see Section 6.8
o IEEE 802.11 RSNA Error Report From Station, see Section 6.12 o IEEE 802.11 RSNA Error Report From Station, see Section 6.12
o IEEE 802.11 Statistics, see Section 6.16 o IEEE 802.11 Statistics, see Section 6.16
o IEEE 802.11 WTP Radio Fail Alarm Indication, see Section 6.24
6. IEEE 802.11 Message Element Definitions 6. IEEE 802.11 Message Element Definitions
The following IEEE 802.11 specific message elements are defined in The following IEEE 802.11 specific message elements are defined in
this section. this section.
IEEE 802.11 Message Element Type Value IEEE 802.11 Message Element Type Value
IEEE 802.11 Add WLAN 1024 IEEE 802.11 Add WLAN 1024
IEEE 802.11 Antenna 1025 IEEE 802.11 Antenna 1025
IEEE 802.11 Assigned WTP BSSID 1026 IEEE 802.11 Assigned WTP BSSID 1026
skipping to change at page 22, line 41 skipping to change at page 23, line 41
IEEE 802.11 Update Station QoS 1043 IEEE 802.11 Update Station QoS 1043
IEEE 802.11 Update WLAN 1044 IEEE 802.11 Update WLAN 1044
IEEE 802.11 WTP Quality of Service 1045 IEEE 802.11 WTP Quality of Service 1045
IEEE 802.11 WTP Radio Configuration 1046 IEEE 802.11 WTP Radio Configuration 1046
IEEE 802.11 WTP Radio Fail Alarm Indication 1047 IEEE 802.11 WTP Radio Fail Alarm Indication 1047
IEEE 802.11 WTP Radio Information 1048 IEEE 802.11 WTP Radio Information 1048
6.1. IEEE 802.11 Add WLAN 6.1. IEEE 802.11 Add WLAN
The IEEE 802.11 Add WLAN message element is used by the AC to define The IEEE 802.11 Add WLAN message element is used by the AC to define
a wireless LAN on the WTP. The inclusion of this message element a WLAN on the WTP. The inclusion of this message element MUST also
MUST also include IEEE 802.11 Information Element message elements, include IEEE 802.11 Information Element message elements, containing
containing the following 802.11 IEs: the following IEEE 802.11 IEs:
Power Capability information element Power Capability information element
WPA information element WPA information element
RSN information element RSN information element
EDCA Parameter Set information element EDCA Parameter Set information element
QoS Capability information element QoS Capability information element
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Key Length: A 16-bit value representing the length of the Key Key Length: A 16-bit value representing the length of the Key
field. field.
Key: A 32 byte Session Key to use to provide data privacy. For Key: A 32 byte Session Key to use to provide data privacy. For
encryption schemes that employ a separate encryption key for encryption schemes that employ a separate encryption key for
unicast and multicast traffic, the key included here only applies unicast and multicast traffic, the key included here only applies
to multicast frames, and the cipher suite is specified in an to multicast frames, and the cipher suite is specified in an
accompanied RSN Information Element. In these scenarios, the key accompanied RSN Information Element. In these scenarios, the key
and cipher information is communicated via the Add Station message and cipher information is communicated via the Add Station message
element, see Section 4.4.8 in [1] and the IEEE 802.11 Station element, see Section 4.5.8 in [1] and the IEEE 802.11 Station
Session Key message element, see Section 6.15. Session Key message element, see Section 6.15.
Group TSC A 48-bit value containing the Transmit Sequence Counter Group TSC A 48-bit value containing the Transmit Sequence Counter
for the updated group key. The WTP will set the TSC for for the updated group key. The WTP will set the TSC for
broadcast/multicast frames to this value for the updated group broadcast/multicast frames to this value for the updated group
key. key.
QOS: An 8-bit value specifying the default QOS policy for the WTP QOS: An 8-bit value specifying the default QOS policy for the WTP
to apply to network traffic received for a non-WMM enabled STA. to apply to network traffic received for a non-WMM enabled STA.
skipping to change at page 25, line 25 skipping to change at page 26, line 25
The following values are supported: The following values are supported:
0 - Open System 0 - Open System
1 - WEP Shared Key 1 - WEP Shared Key
MAC Mode: This field specifies whether the WTP should support the MAC Mode: This field specifies whether the WTP should support the
WLAN in Local or Split MAC modes. Note that the AC MUST NOT WLAN in Local or Split MAC modes. Note that the AC MUST NOT
request a mode of operation that was not advertised by the WTP request a mode of operation that was not advertised by the WTP
during the discovery process (see Section 4.4.40 in [1]). The during the discovery process (see Section 4.4.42 in [1]). The
following values are supported: following values are supported:
0 - Local-MAC: Service for the WLAN is to be provided in Local 0 - Local-MAC: Service for the WLAN is to be provided in Local
MAC mode. MAC mode.
1 - Split-MAC: Service for the WLAN is to be provided in Split 1 - Split-MAC: Service for the WLAN is to be provided in Split
MAC mode. MAC mode.
Tunnel Mode: This field specifies the frame tunneling type to be Tunnel Mode: This field specifies the frame tunneling type to be
used for 802.11 data frames from all stations associated with the used for 802.11 data frames from all stations associated with the
WLAN. The AC MUST NOT request a mode of operation that was not WLAN. The AC MUST NOT request a mode of operation that was not
advertised by the WTP during the discovery process (see Section advertised by the WTP during the discovery process (see Section
4.4.38 in [1]). IEEE 802.11 managment frames SHALL be tunneled 4.4.40 in [1]). IEEE 802.11 managment frames SHALL be tunneled
using 802.11 Tunnel mode. The following values are supported: using 802.11 Tunnel mode. The following values are supported:
0 - Local Bridging: All user traffic is to be locally bridged. 0 - Local Bridging: All user traffic is to be locally bridged.
1 - 802.3 Tunnel: All user traffic is to be tunneled to the AC 1 - 802.3 Tunnel: All user traffic is to be tunneled to the AC
in 802.3 format (see Section 4.2 in [1]). in 802.3 format (see Section 4.2 in [1]).
2 - 802.11 Tunnel: All user traffic is to be tunneled to the AC 2 - 802.11 Tunnel: All user traffic is to be tunneled to the AC
in 802.11 format. in 802.11 format.
skipping to change at page 47, line 50 skipping to change at page 48, line 50
field. field.
Key: A 32 byte Session Key to use to provide data privacy. For Key: A 32 byte Session Key to use to provide data privacy. For
static WEP keys, which is true when the 'Key Status' bit is set to static WEP keys, which is true when the 'Key Status' bit is set to
one, this key is used for both unicast and multicast traffic. For one, this key is used for both unicast and multicast traffic. For
encryption schemes that employ a separate encryption key for encryption schemes that employ a separate encryption key for
unicast and multicast traffic, the key included hereonly applies unicast and multicast traffic, the key included hereonly applies
to multicast data, and the cipher suite is specified in an to multicast data, and the cipher suite is specified in an
accompanied RSN Information Element. In these scenarios, the key, accompanied RSN Information Element. In these scenarios, the key,
and cipher information, is communicated via the Add Station and cipher information, is communicated via the Add Station
message element, see [1]. message element, see Section 4.5.8 in [1].
6.22. IEEE 802.11 WTP Quality of Service 6.22. IEEE 802.11 WTP Quality of Service
The IEEE 802.11 WTP Quality of Service message element value is sent The IEEE 802.11 WTP Quality of Service message element value is sent
by the AC to the WTP to communicate quality of service configuration by the AC to the WTP to communicate quality of service configuration
information. information.
0 1 0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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The AC SHOULD use an RSC of 0 when computing message-3 of the 4-way The AC SHOULD use an RSC of 0 when computing message-3 of the 4-way
802.11i handshake, unless the AC has knowledge of a more optimal RSC 802.11i handshake, unless the AC has knowledge of a more optimal RSC
value to use. Mechanisms for determining a more optimal RSC value value to use. Mechanisms for determining a more optimal RSC value
are outside the scope of this specification. are outside the scope of this specification.
10. IANA Considerations 10. IANA Considerations
There are no IANA Considerations. There are no IANA Considerations.
11. References 11. Acknowledgements
11.1. Normative References The following individuals are acknowledged for their contributions to
this binding specification: Puneet Agarwal, Charles Clancy, Saravanan
Govindan, Scott Kelly, Peter Nilsson, Bob O'Hara, David Perkins and
Margaret Wasserman.
[1] "draft-ietf-capwap-protocol-specification-03". 12. References
12.1. Normative References
[1] "draft-ietf-capwap-protocol-specification-05".
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement [2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997. Levels", BCP 14, RFC 2119, March 1997.
[3] "Information technology - Telecommunications and information [3] "Information technology - Telecommunications and information
exchange between systems - Local and metropolitan area networks exchange between systems - Local and metropolitan area networks
- Specific requirements - Part 11: Wireless LAN Medium Access - Specific requirements - Part 11: Wireless LAN Medium Access
Control (MAC) and Physical Layer (PHY) specifications", Control (MAC) and Physical Layer (PHY) specifications",
IEEE Standard 802.11, 1999, IEEE Standard 802.11, 1999,
<http://standards.ieee.org/getieee802/download/ <http://standards.ieee.org/getieee802/download/
skipping to change at page 59, line 5 skipping to change at page 61, line 5
[8] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) [8] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS)
Protocol Version 1.1", RFC 4346, April 2006. Protocol Version 1.1", RFC 4346, April 2006.
[9] Manner, J. and M. Kojo, "Mobility Related Terminology", [9] Manner, J. and M. Kojo, "Mobility Related Terminology",
RFC 3753, June 2004. RFC 3753, June 2004.
[10] Rescorla et al, E., "Datagram Transport Layer Security", [10] Rescorla et al, E., "Datagram Transport Layer Security",
June 2004. June 2004.
11.2. Informational References 12.2. Informational References
[11] "WiFi Protected Access (WPA) rev 1.6", April 2003. [11] "WiFi Protected Access (WPA) rev 1.6", April 2003.
Authors' Addresses Editors' Addresses
Pat R. Calhoun Pat R. Calhoun
Cisco Systems, Inc. Cisco Systems, Inc.
170 West Tasman Drive 170 West Tasman Drive
San Jose, CA 95134 San Jose, CA 95134
Phone: +1 408-853-5269 Phone: +1 408-853-5269
Email: pcalhoun@cisco.com Email: pcalhoun@cisco.com
Michael P. Montemurro Michael P. Montemurro
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