Internet Engineering Task Force (IETF) Y. Shi, Ed.

Internet Engineering Task Force (IETF) Y. Shi, Ed.
Request for Comments: 5834 Hangzhou H3C Tech. Co., Ltd.
Category: Informational D. Perkins, Ed.
ISSN: 2070-1721 C. Elliott, Ed.

Y. Zhang, Ed.
Fortinet, Inc.
May 2010

Control and Provisioning of Wireless Access Points (CAPWAP) Protocol
Binding MIB for IEEE 802.11

Abstract

This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols. In particular, it
describes managed objects for modeling the Control And Provisioning
of Wireless Access Points (CAPWAP) protocol for IEEE 802.11 wireless
binding. This MIB module is presented as a basis for future work on
the management of the CAPWAP protocol using the Simple Network
Management Protocol (SNMP).

Status of This Memo

This document is not an Internet Standards Track specification; it is
published for informational purposes.

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 a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.

Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5834.

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Copyright Notice

Copyright (c) 2010 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
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.

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The Internet-Standard Management Framework . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. WLAN Profile . . . . . . . . . . . . . . . . . . . . . . . 5
5.2. Requirements and Constraints . . . . . . . . . . . . . . . 5
5.3. Mechanism of Reusing Wireless Binding MIB Module . . . . . 6
6. Structure of MIB Module . . . . . . . . . . . . . . . . . . . 6
7. Relationship to Other MIB Modules . . . . . . . . . . . . . . 7
7.1. Relationship to SNMPv2-MIB Module . . . . . . . . . . . . 7
7.2. Relationship to IF-MIB Module . . . . . . . . . . . . . . 7
7.3. Relationship to CAPWAP-BASE-MIB Module . . . . . . . . . . 7
7.4. Relationship to MIB Module in the IEEE 802.11 Standard . . 8
7.5. MIB Modules Required for IMPORTS . . . . . . . . . . . . . 8
8. Example of CAPWAP-DOT11-MIB Module Usage . . . . . . . . . . . 8
9. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 14
10. Security Considerations . . . . . . . . . . . . . . . . . . . 21
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
11.1. IANA Considerations for CAPWAP-DOT11-MIB Module . . . . . 22
11.2. IANA Considerations for ifType . . . . . . . . . . . . . . 22
12. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 22
13. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 23
14. References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
14.1. Normative References . . . . . . . . . . . . . . . . . . . 23
14.2. Informative References . . . . . . . . . . . . . . . . . . 24

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1. Introduction

The CAPWAP protocol [RFC5415] defines a standard, interoperable
protocol, which enables an Access Controller (AC) to manage a
collection of Wireless Termination Points (WTPs). CAPWAP supports
the use of various wireless technologies by the WTPs, with one
specified in the CAPWAP Protocol Binding for IEEE 802.11 [RFC5416].

This document defines a MIB module that can be used to manage CAPWAP
implementations for IEEE 802.11 wireless binding. This MIB module
covers both configuration for Wireless Local Area Network (WLAN) and
a way to reuse the IEEE 802.11 MIB module [IEEE.802-11.2007]. It is
presented as a basis for future work on the SNMP management of the
CAPWAP protocol.

2. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC3410].

Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579], and STD 58, RFC 2580
[RFC2580].

3. Terminology

This document uses terminology from the CAPWAP protocol specification
[RFC5415], the CAPWAP Protocol Binding for IEEE 802.11 [RFC5416], and
the CAPWAP Protocol Base MIB [RFC5833].

Access Controller (AC): The network entity that provides WTP access
to the network infrastructure in the data plane, control plane,
management plane, or a combination therein.

Wireless Termination Point (WTP): The physical or network entity that
contains an RF antenna and wireless physical layer (PHY) to transmit
and receive station traffic for wireless access networks.

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Control And Provisioning of Wireless Access Points (CAPWAP): It is a
generic protocol defining AC and WTP control and data plane
communication via a CAPWAP protocol transport mechanism. CAPWAP
control messages, and optionally CAPWAP data messages, are secured
using Datagram Transport Layer Security (DTLS) [RFC4347].

CAPWAP Control Channel: A bi-directional flow defined by the AC IP
Address, WTP IP Address, AC control port, WTP control port, and the
transport-layer protocol (UDP or UDP-Lite) over which CAPWAP control
packets are sent and received.

CAPWAP Data Channel: A bi-directional flow defined by the AC IP
Address, WTP IP Address, AC data port, WTP data port, and the
transport-layer protocol (UDP or UDP-Lite) over which CAPWAP data
packets are sent and received.

Station (STA): A device that contains an interface to a wireless
medium (WM).

Split and Local MAC: The CAPWAP protocol supports two modes of
operation: Split and Local MAC (medium access control). In Split MAC
mode, all Layer 2 wireless data and management frames are
encapsulated via the CAPWAP protocol and exchanged between the AC and
the WTPs. The Local MAC mode of operation allows the data frames to
be either locally bridged or tunneled as 802.3 frames.

Wireless Binding: The CAPWAP protocol is independent of a specific
WTP radio technology, as well its associated wireless link layer
protocol. Elements of the CAPWAP protocol are designed to
accommodate the specific needs of each wireless technology in a
standard way. Implementation of the CAPWAP protocol for a particular
wireless technology MUST define a binding protocol for it, e.g., the
binding for IEEE 802.11, provided in [RFC5416].

Wireless Local Area Network (WLAN): A 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 are denoted as a
distinct WLAN on a physical WTP. To support a physical WTP with
multiple WLANs is an important feature for CAPWAP protocol's 802.11
binding, and it is also for MIB module design.

Wireless Binding MIB Module: Other Standards Development
Organizations (SDOs), such as IEEE, already defined MIB modules for
specific wireless technologies, e.g., the IEEE 802.11 MIB module
[IEEE.802-11.2007]. Such MIB modules are called wireless binding MIB
modules.

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CAPWAP Protocol Wireless Binding MIB Module: It is a MIB module
corresponding to the CAPWAP Protocol Binding for a wireless binding.
Sometimes, not all the technology-specific message elements in a
CAPWAP binding protocol have MIB objects defined by other SDOs. For
example, the protocol of [RFC5416] defines WLAN conception. Also,
Local or Split MAC modes could be specified for a WLAN. The MAC mode
for a WLAN is not in the scope of IEEE 802.11 [IEEE.802-11.2007]. In
such cases, in addition to the existing wireless binding MIB modules
defined by other SDOs, a CAPWAP protocol wireless binding MIB module
is required to be defined for a wireless binding.

4. Conventions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].

5. Overview

5.1. WLAN Profile

A WLAN profile stores configuration parameters such as MAC type and
tunnel mode for a WLAN. Each WLAN profile is identified by a profile
identifier. The operator needs to create WLAN profiles before WTPs
connect to the AC. To provide WLAN service, the operator SHOULD bind
WLAN profiles to a WTP Virtual Radio Interface that corresponds to a
PHY radio. During the binding operation, the AC MUST select an
unused WLAN ID between 1 and 16 [RFC5416]. For example, to bind one
more WLAN profile to a radio that has been bound with a WLAN profile,
the AC SHOULD allocate WLAN ID 2 to the radio. Although the maximum
value of a WLAN ID is 16, the operator could configure more than 16
WLAN Profiles on the AC.

5.2. Requirements and Constraints

The IEEE 802.11 MIB module [IEEE.802-11.2007] already defines MIB
objects for most IEEE 802.11 Message Elements in the CAPWAP Protocol
Binding for IEEE 802.11 [RFC5416]. As a CAPWAP protocol 802.11
binding MIB module, the CAPWAP-DOT11-MIB module MUST be able to reuse
such MIB objects in the IEEE 802.11 MIB module and support functions
(such as MAC mode for WLAN in the [RFC5416]) that are not in the
scope of IEEE 802.11 standard. The CAPWAP-DOT11-MIB module MUST
support such functions.

In summary, the CAPWAP-DOT11-MIB module needs to support:

- Reuse of wireless binding MIB modules in the IEEE 802.11 standard;

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- Centralized management and configuration of WLAN profiles on the
AC;

- Configuration of a MAC type and tunnel mode for a specific WLAN
profile.

5.3. Mechanism of Reusing Wireless Binding MIB Module

In the IEEE 802.11 MIB module, the MIB tables such as
dot11AuthenticationAlgorithmsTable are able to support WLAN
configuration (such as authentication algorithm), and these tables
use the ifIndex as the index which works well in the autonomous WLAN
architecture.

Reuse of such wireless binding MIB modules is very important to
centralized WLAN architectures. The key point is to abstract a WLAN
profile as a WLAN Profile Interface on the AC, which could be
identified by an ifIndex. The MIB objects in the IEEE 802.11 MIB
module which are associated with this interface can be used to
configure WLAN parameters for the WLAN, such as authentication
algorithm. With the ifIndex of a WLAN Profile Interface, the AC is
able to reuse the IEEE 802.11 MIB module.

In the CAPWAP-BASE-MIB module, each PHY radio is identified by a WTP
ID and a radio ID, and has a corresponding WTP Virtual Radio
Interface on the AC. The IEEE 802.11 MIB module associated with this
interface can be used to configure IEEE 802.11 wireless binding
parameters for the radio such as RTS Threshold. A WLAN Basic Service
Set (BSS) Interface, created by binding a WLAN to a WTP Virtual Radio
Interface, is used for data forwarding.

6. Structure of MIB Module

The MIB objects are derived from the CAPWAP protocol binding for IEEE
802.11 document [RFC5416].

capwapDot11WlanTable

The table allows the operator to display and configure WLAN
profiles, such as specifying the MAC type and tunnel mode for a
WLAN. Also, it helps the AC to configure a WLAN through the IEEE
802.11 MIB module.

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capwapDot11WlanBindTable

The table provides a way to bind WLAN profiles to a WTP Virtual
Radio Interface, which has a corresponding PHY radio. A binding
operation dynamically creates a WLAN BSS Interface, which is used
for data forwarding.

7. Relationship to Other MIB Modules

7.1. Relationship to SNMPv2-MIB Module

The CAPWAP-DOT11-MIB module does not duplicate the objects of the
'system' group in the SNMPv2-MIB [RFC3418] that is defined as being
mandatory for all systems, and the objects apply to the entity as a
whole. The 'system' group provides identification of the management
entity and certain other system-wide data.

7.2. Relationship to IF-MIB Module

The Interfaces Group [RFC2863] defines generic managed objects for
managing interfaces. This memo contains the media-specific
extensions to the Interfaces Group for managing WLAN that are modeled
as interfaces.

Each WLAN profile corresponds to a WLAN Profile Interface on the AC.
The interface MUST be modeled as an ifEntry, and ifEntry objects such
as ifIndex, ifDescr, ifName, and ifAlias are to be used as per
[RFC2863]. The WLAN Profile Interface provides a way to configure
IEEE 802.11 parameters for a specific WLAN and reuse the IEEE 802.11
MIB module.

To provide data forwarding service, the AC dynamically creates WLAN
BSS Interfaces. A WLAN BSS Interface MUST be modeled as an ifEntry,
and ifEntry objects such as ifIndex, ifDescr, ifName, and ifAlias are
to be used as per [RFC2863]. The interface enables a single physical
WTP to support multiple WLANs.

Also, the AC MUST have a mechanism that preserves the value of the
ifIndexes (of both the WLAN Profile Interfaces and the WLAN BSS
Interfaces) in the ifTable at AC reboot.

7.3. Relationship to CAPWAP-BASE-MIB Module

The CAPWAP-BASE-MIB module provides a way to manage and control WTP
and radio objects. Especially, it provides the WTP Virtual Radio
Interface mechanism to enable the AC to reuse the IEEE 802.11 MIB
module. With this mechanism, an operator could configure an IEEE

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802.11 radio's parameters and view the radio's traffic statistics on
the AC. Based on the CAPWAP-BASE-MIB module, the CAPWAP-DOT11-MIB
module provides more WLAN information.

7.4. Relationship to MIB Module in the IEEE 802.11 Standard

With the ifIndex of WLAN Profile Interface and WLAN BSS Interface,
the MIB module is able to reuse the IEEE 802.11 MIB module
[IEEE.802-11.2007]. The CAPWAP-DOT11-MIB module does not duplicate
those objects in the IEEE 802.11 MIB module.

The CAPWAP Protocol Binding for IEEE 802.11 [RFC5416] involves some
of the MIB objects defined in the IEEE 802.11 standard. Although
CAPWAP-DOT11-MIB module uses it [RFC5416] as a reference, it could
reuse all the MIB objects in the IEEE 802.11 standard , and is not
limited by the scope of CAPWAP Protocol Binding for IEEE 802.11.

7.5. MIB Modules Required for IMPORTS

The following MIB modules are required for IMPORTS: SNMPv2-SMI
[RFC2578], SNMPv2-TC [RFC2579], SNMPv2-CONF [RFC2580], IF-MIB
[RFC2863], and CAPWAP-BASE-MIB [RFC5833].

8. Example of CAPWAP-DOT11-MIB Module Usage

1) Create a WTP profile.

Suppose the WTP's base MAC address is '00:01:01:01:01:00'.
Creates a WTP profile for it through the capwapBaseWtpProfileTable
[RFC5833] as follows:

In capwapBaseWtpProfileTable
{
capwapBaseWtpProfileId = 1,
capwapBaseWtpProfileName = 'WTP Profile 123456',
capwapBaseWtpProfileWtpMacAddress = '00:01:01:01:01:00',
capwapBaseWtpProfileWTPModelNumber = 'WTP123',
capwapBaseWtpProfileWtpName = 'WTP 123456',
capwapBaseWtpProfileWtpLocation = 'office',
capwapBaseWtpProfileWtpStaticIpEnable = true(1),
capwapBaseWtpProfileWtpStaticIpType = ipv4(1),
capwapBaseWtpProfileWtpStaticIpAddress = '192.0.2.10',
capwapBaseWtpProfileWtpNetmask = '255.255.255.0',
capwapBaseWtpProfileWtpGateway = '192.0.2.1',
capwapBaseWtpProfileWtpFallbackEnable = true(1),
capwapBaseWtpProfileWtpEchoInterval = 30,
capwapBaseWtpProfileWtpIdleTimeout = 300,
capwapBaseWtpProfileWtpMaxDiscoveryInterval = 20,

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capwapBaseWtpProfileWtpReportInterval = 120,
capwapBaseWtpProfileWtpStatisticsTimer = 120,
capwapBaseWtpProfileWtpEcnSupport = limited(0)
}

Suppose the WTP with model number 'WTP123' has one PHY radio and
this PHY radio is identified by ID 1. The creation of this WTP
profile triggers the AC to automatically create a WTP Virtual
Radio Interface and add a new row object to the
capwapBaseWirelessBindingTable without manual intervention.
Suppose the ifIndex of the WTP Virtual Radio Interface is 10. The
following information is stored in the
capwapBaseWirelessBindingTable.

In capwapBaseWirelessBindingTable
{
capwapBaseWtpProfileId = 1,
capwapBaseWirelessBindingRadioId = 1,
capwapBaseWirelessBindingVirtualRadioIfIndex = 10,
capwapBaseWirelessBindingType = dot11(2)
}

The WTP Virtual Radio Interfaces on the AC correspond to the PHY
radios on the WTP. The WTP Virtual Radio Interface is modeled by
ifTable [RFC2863].

In ifTable
{
ifIndex = 10,
ifDescr = 'WTP Virtual Radio Interface',
ifType = 254,
ifMtu = 0,
ifSpeed = 0,
ifPhysAddress = '00:00:00:00:00:00',
ifAdminStatus = true(1),
ifOperStatus = false(0),
ifLastChange = 0,
ifInOctets = 0,
ifInUcastPkts = 0,
ifInDiscards = 0,
ifInErrors = 0,
ifInUnknownProtos = 0,
ifOutOctets = 0,
ifOutUcastPkts = 0,
ifOutDiscards = 0,
ifOutErrors = 0
}

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2) Query the ifIndexes of WTP Virtual Radio Interfaces.

Before configuring PHY radios, the operator needs to get the
ifIndexes of WTP Virtual Radio Interfaces corresponding to the PHY
radios.

As the capwapBaseWirelessBindingTable already stores the mappings
between PHY radios (Radio IDs) and the ifIndexes of WTP Virtual
Radio Interfaces, the operator can get the ifIndex information by
querying this table. Such a query operation SHOULD run from radio
ID 1 to radio ID 31 (according to [RFC5415]), and stop when an
invalid ifIndex value (0) is returned.

This example uses capwapBaseWtpProfileId = 1 and
capwapBaseWirelessBindingRadioId = 1 as inputs to query the
capwapBaseWirelessBindingTable, and gets
capwapBaseWirelessBindingVirtualRadioIfIndex = 10. Then it uses
capwapBaseWtpProfileId = 1 and capwapBaseWirelessBindingRadioId =
2, and gets an invalid ifIndex value (0), so the query operation
ends. This method gets not only the ifIndexes of WTP Virtual
Radio Interfaces, but also the numbers of PHY radios. Besides
checking whether the ifIndex value is valid, the operator SHOULD
check whether the capwapBaseWirelessBindingType is the desired
binding type.

3) Configure IEEE 802.11 parameters for a WTP Virtual Radio Interface

This configuration is made on the AC through the IEEE 802.11 MIB
module.

The following shows an example of configuring parameters for a WTP
Virtual Radio Interface with ifIndex 10 through the
dot11OperationTable [IEEE.802-11.2007].

In dot11OperationTable
{
ifIndex = 10,
dot11MACAddress = '00:00:00:00:00:00',
dot11RTSThreshold = 2347,
dot11ShortRetryLimit = 7,
dot11LongRetryLimit = 4,
dot11FragmentationThreshold = 256,
dot11MaxTransmitMSDULifetime = 512,
dot11MaxReceiveLifetime = 512,
dot11ManufacturerID = 'capwap',
dot11ProductID = 'capwap',
dot11CAPLimit = 2,
dot11HCCWmin = 0,

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dot11HCCWmax = 0,
dot11HCCAIFSN = 1,
dot11ADDBAResponseTimeout = 1,
dot11ADDTSResponseTimeout = 1,
dot11ChannelUtilizationBeaconInterval = 50,
dot11ScheduleTimeout = 10,
dot11DLSResponseTimeout = 10,
dot11QAPMissingAckRetryLimit = 1,
dot11EDCAAveragingPeriod = 5
}

4) Configure a WLAN Profile.

WLAN configuration is made on the AC through the CAPWAP-DOT11-MIB
module, and IEEE 802.11 MIB module.

The first step is to create a WLAN Profile Interface through the
CAPWAP-DOT11-MIB module on the AC.

For example, when you configure a WLAN profile that is identified
by capwapDot11WlanProfileId 1, the capwapDot11WlanTable creates
the following row object for it.

In capwapDot11WlanTable
{
capwapDot11WlanProfileId = 1,
capwapDot11WlanProfileIfIndex = 20,
capwapDot11WlanMacType = splitMAC(2),
capwapDot11WlanTunnelMode = dot3Tunnel(2),
capwapDot11WlanRowStatus = createAndGo(4)
}

The creation of a row object triggers the AC to automatically
create a WLAN Profile Interface and it is identified by ifIndex 20
without manual intervention.

A WLAN Profile Interface MUST be modeled as an ifEntry on the AC
that provides appropriate interface information. The
capwapDot11WlanTable stores the mappings between
capwapDot11WlanProfileIds and the ifIndexes of WLAN Profile
Interfaces.

In ifTable
{
ifIndex = 20,
ifDescr = 'WLAN Profile Interface',
ifType = 252,
ifMtu = 0,

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ifSpeed = 0,
ifPhysAddress = '00:00:00:00:00:00',
ifAdminStatus = true(1),
ifOperStatus = true(1),
ifLastChange = 0,
ifInOctets = 0,
ifInUcastPkts = 0,
ifInDiscards = 0,
ifInErrors = 0,
ifInUnknownProtos = 0,
ifOutOctets = 0,
ifOutUcastPkts = 0,
ifOutDiscards = 0,
ifOutErrors = 0
}

The second step is to configure WLAN parameters for the WLAN
Profile Interface through the IEEE 802.11 MIB module on the AC.

The following example configures an authentication algorithm for a
WLAN.

In dot11AuthenticationAlgorithmsTable
{
ifIndex = 20,
dot11AuthenticationAlgorithmsIndex = 1,
dot11AuthenticationAlgorithm = Shared Key(2),
dot11AuthenticationAlgorithmsEnable = true(1)
}

Here, ifIndex 20 identifies the WLAN Profile Interface, and the
index of the configured authentication algorithm is 1.

5) Bind WLAN Profiles to a WTP radio.

On the AC, the capwapDot11WlanBindTable in the CAPWAP-DOT11-MIB
stores the bindings between WLAN profiles(identified by
capwapDot11WlanProfileId) and WTP Virtual Radio Interfaces
(identified by the ifIndex).

For example, after the operator binds a WLAN profile with
capwapDot11WlanProfileId 1 to WTP Virtual Radio Interface with
ifIndex 10, the capwapDot11WlanBindTable creates the following row
object.

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In capwapDot11WlanBindTable
{
ifIndex = 10,
capwapDot11WlanProfileId = 1,
capwapDot11WlanBindBssIfIndex = 30,
capwapDot11WlanBindRowStatus = createAndGo(4)
}

If the capwapDot11WlanMacType of the WLAN is splitMAC(2), the
creation of the row object in the capwapDot11WlanBindTable
triggers the AC to automatically create a WLAN BSS Interface
identified by ifIndex 30 without manual intervention.

The WLAN BSS Interface MUST be modeled as an ifEntry on the AC,
which provides appropriate interface information. The
capwapDot11WlanBindTable stores the mappings among the ifIndex of
a WTP Virtual Radio Interface, WLAN profile ID, WLAN ID, and the
ifIndex of a WLAN BSS Interface.

6) Get the current configuration status report from the WTP to the
AC.

Before a WTP that has joined the AC gets configuration from the
AC, it needs to report its current configuration status by sending
a configuration status request message to the AC, which uses the
message to update corresponding MIB objects on the AC. For
example, for ifIndex 10 (which identifies a WLAN Virtual Radio
Interface), its ifOperStatus in the ifTable is updated according
to the current radio operational status in the CAPWAP message
[RFC5415].

7) Query WTP and radio statistical data.

After WTPs start to run, the operator could query WTP and radio
statistics data through the CAPWAP-BASE-MIB and CAPWAP-DOT11-MIB
modules. For example, through the dot11CountersTable
[IEEE.802-11.2007], the operator could query counter data of a
radio that is identified by the ifIndex of the corresponding WLAN
Virtual Radio Interface.

8) Query other statistical data.

The operator could query the configuration of a WLAN through the
dot11AuthenticationAlgorithmsTable [IEEE.802-11.2007] and the
statistical data of a WLAN BSS Interface through the ifTable
[RFC2863].

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9. Definitions

CAPWAP-DOT11-MIB DEFINITIONS ::= BEGIN

IMPORTS
RowStatus, TEXTUAL-CONVENTION
FROM SNMPv2-TC
OBJECT-GROUP, MODULE-COMPLIANCE
FROM SNMPv2-CONF
MODULE-IDENTITY, OBJECT-TYPE, mib-2, Unsigned32
FROM SNMPv2-SMI
ifIndex, InterfaceIndex
FROM IF-MIB
CapwapBaseMacTypeTC, CapwapBaseTunnelModeTC
FROM CAPWAP-BASE-MIB;

capwapDot11MIB MODULE-IDENTITY
LAST-UPDATED "201004300000Z" -- 30 April 2010
ORGANIZATION "IETF Control And Provisioning of Wireless Access
Points (CAPWAP) Working Group
http://www.ietf.org/html.charters/capwap-charter.html"
CONTACT-INFO
"General Discussion: [email protected]
To Subscribe: http://lists.frascone.com/mailman/listinfo/capwap

Yang Shi (editor)
Hangzhou H3C Tech. Co., Ltd.
Beijing R&D Center of H3C, Digital Technology Plaza
NO. 9 Shangdi 9th Street, Haidian District
Beijing 100085
China
Phone: +86 010 82775276
Email: [email protected]

David T. Perkins (editor)
228 Bayview Dr.
San Carlos, CA 94070
USA
Phone: +1 408 394-8702
Email: [email protected]

Chris Elliott (editor)
1516 Kent St.
Durham, NC 27707
USA
Phone: +1 919-308-1216
Email: [email protected]

Shi, et al. Informational [Page 14]

RFC 5834 CAPWAP Protocol Binding MIB May 2010

Yong Zhang (editor)
Fortinet, Inc.
1090 Kifer Road
Sunnyvale, CA 94086
USA
Email: [email protected]"

DESCRIPTION
"Copyright (c) 2010 IETF Trust and the persons identified as
authors of the code. All rights reserved.

Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(http://trustee.ietf.org/license-info).

This version of this MIB module is part of RFC 5834;
see the RFC itself for full legal notices.

This MIB module contains managed object definitions for
CAPWAP Protocol binding for IEEE 802.11."
REVISION "201004300000Z"
DESCRIPTION
"Initial version, published as RFC 5834"
::= { mib-2 195 }

-- Textual conventions

CapwapDot11WlanIdTC ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"Represents the unique identifier of a Wireless Local Area
Network (WLAN)."
SYNTAX Unsigned32 (1..16)

CapwapDot11WlanIdProfileTC ::= TEXTUAL-CONVENTION
DISPLAY-HINT "d"
STATUS current
DESCRIPTION
"Represents the unique identifier of a WLAN profile."
SYNTAX Unsigned32 (1..512)

-- Top level components of this MIB module

-- Tables, Scalars

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

capwapDot11Objects OBJECT IDENTIFIER
::= { capwapDot11MIB 1 }
-- Conformance
capwapDot11Conformance OBJECT IDENTIFIER
::= { capwapDot11MIB 2 }

-- capwapDot11WlanTable Table

capwapDot11WlanTable OBJECT-TYPE
SYNTAX SEQUENCE OF CapwapDot11WlanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table that allows the operator to display and configure
WLAN profiles, such as specifying the MAC type and tunnel mode
for a WLAN. Also, it helps the AC to configure a WLAN through
the IEEE 802.11 MIB module.
Values of all objects in this table are persistent at
restart/reboot."
::= { capwapDot11Objects 1 }

capwapDot11WlanEntry OBJECT-TYPE
SYNTAX CapwapDot11WlanEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of objects that stores the settings of a WLAN profile."
INDEX { capwapDot11WlanProfileId }
::= { capwapDot11WlanTable 1 }

CapwapDot11WlanEntry ::=
SEQUENCE {
capwapDot11WlanProfileId CapwapDot11WlanIdProfileTC,
capwapDot11WlanProfileIfIndex InterfaceIndex,
capwapDot11WlanMacType CapwapBaseMacTypeTC,
capwapDot11WlanTunnelMode CapwapBaseTunnelModeTC,
capwapDot11WlanRowStatus RowStatus
}

capwapDot11WlanProfileId OBJECT-TYPE
SYNTAX CapwapDot11WlanIdProfileTC
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Represents the identifier of a WLAN profile that has a
corresponding capwapDot11WlanProfileIfIndex."
::= { capwapDot11WlanEntry 1 }

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

capwapDot11WlanProfileIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the index value that uniquely identifies a
WLAN Profile Interface. The interface identified by a
particular value of this index is the same interface as
identified by the same value of the ifIndex.
The creation of a row object in the capwapDot11WlanTable
triggers the AC to automatically create an WLAN Profile
Interface identified by an ifIndex without manual
intervention.
Most MIB tables in the IEEE 802.11 MIB module
[IEEE.802-11.2007] use an ifIndex to identify an interface
to facilitate the configuration and maintenance, for example,
dot11AuthenticationAlgorithmsTable.
Using the ifIndex of a WLAN Profile Interface, the Operator
could configure a WLAN through the IEEE 802.11 MIB module."
::= { capwapDot11WlanEntry 2 }

capwapDot11WlanMacType OBJECT-TYPE
SYNTAX CapwapBaseMacTypeTC
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Represents whether the WTP SHOULD support the WLAN in
Local or Split MAC modes."
REFERENCE
"Section 6.1 of CAPWAP Protocol Binding for IEEE 802.11,
RFC 5416."
::= { capwapDot11WlanEntry 3 }

capwapDot11WlanTunnelMode OBJECT-TYPE
SYNTAX CapwapBaseTunnelModeTC
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Represents the frame tunneling mode to be used for IEEE 802.11
data frames from all stations associated with the WLAN.
Bits are exclusive with each other for a specific WLAN profile,
and only one tunnel mode could be configured.
If the operator set more than one bit, the value of the
Response-PDU's error-status field is set to 'wrongValue',
and the value of its error-index field is set to the index of
the failed variable binding."
REFERENCE
"Section 6.1 of CAPWAP Protocol Binding for IEEE 802.11,

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

RFC 5416."
::= { capwapDot11WlanEntry 4 }

capwapDot11WlanRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable is used to create, modify, and/or delete a row
in this table.
All the objects in a row can be modified only when the value
of this object in the corresponding conceptual row is not
'active'. Thus, to modify one or more of the objects in
this conceptual row:
a. change the row status to 'notInService',
b. change the values of the row
c. change the row status to 'active'
The capwapDot11WlanRowStatus may be changed to 'active'
if all the managed objects in the conceptual row with
MAX-ACCESS read-create have been assigned valid values.

When the operator deletes a WLAN profile, the AC SHOULD
check whether the WLAN profile is bound with a radio.
If yes, the value of the Response-PDU's error-status field
is set to 'inconsistentValue', and the value of its
error-index field is set to the index of the failed variable
binding. If not, the row object could be deleted."
::= { capwapDot11WlanEntry 5 }

-- End of capwapDot11WlanTable Table

-- capwapDot11WlanBindTable Table

capwapDot11WlanBindTable OBJECT-TYPE
SYNTAX SEQUENCE OF CapwapDot11WlanBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table that stores bindings between WLAN profiles
(identified by capwapDot11WlanProfileId) and WTP Virtual Radio
Interfaces. The WTP Virtual Radio Interfaces on the AC
correspond to physical layer (PHY) radios on the WTPs.
It also stores the mappings between WLAN IDs and WLAN
Basic Service Set (BSS) Interfaces.
Values of all objects in this table are persistent at
restart/reboot."
REFERENCE

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

"Section 6.1 of CAPWAP Protocol Binding for IEEE 802.11,
RFC 5416."
::= { capwapDot11Objects 2 }

capwapDot11WlanBindEntry OBJECT-TYPE
SYNTAX CapwapDot11WlanBindEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A set of objects that stores the binding of a WLAN profile
to a WTP Virtual Radio Interface. It also stores the mapping
between WLAN ID and WLAN BSS Interface.
The INDEX object ifIndex is the ifIndex of a WTP Virtual
Radio Interface."
INDEX { ifIndex, capwapDot11WlanProfileId }
::= { capwapDot11WlanBindTable 1 }

CapwapDot11WlanBindEntry ::=
SEQUENCE {
capwapDot11WlanBindWlanId CapwapDot11WlanIdTC,
capwapDot11WlanBindBssIfIndex InterfaceIndex,
capwapDot11WlanBindRowStatus RowStatus
}

capwapDot11WlanBindWlanId OBJECT-TYPE
SYNTAX CapwapDot11WlanIdTC
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the WLAN ID of a WLAN.
During a binding operation, the AC MUST select an unused
WLAN ID from between 1 and 16 [RFC5416]. For example, to bind
another WLAN profile to a radio that has been bound with
a WLAN profile, WLAN ID 2 should be assigned."
REFERENCE
"Section 6.1 of CAPWAP Protocol Binding for IEEE 802.11,
RFC 5416."
::= { capwapDot11WlanBindEntry 1 }

capwapDot11WlanBindBssIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Represents the index value that uniquely identifies a
WLAN BSS Interface. The interface identified by a
particular value of this index is the same interface as
identified by the same value of the ifIndex.

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

The ifIndex here is for a WLAN BSS Interface.
The creation of a row object in the capwapDot11WlanBindTable
triggers the AC to automatically create a WLAN BSS Interface
identified by an ifIndex without manual intervention.
The PHY address of the capwapDot11WlanBindBssIfIndex is the
BSSID. While manufacturers are free to assign BSSIDs by using
any arbitrary mechanism, it is advised that where possible the
BSSIDs are assigned as a contiguous block.
When assigned as a block, implementations can still assign
any of the available BSSIDs to any WLAN. One possible method
is for the WTP to assign the address using the following
algorithm: base BSSID address + WLAN ID."
REFERENCE
"Section 2.4 of CAPWAP Protocol Binding for IEEE 802.11,
RFC 5416."
::= { capwapDot11WlanBindEntry 2 }

capwapDot11WlanBindRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable is used to create, modify, and/or delete a row
in this table.
All the objects in a row can be modified only when the value
of this object in the corresponding conceptual row is not
'active'. Thus, to modify one or more of the objects in
this conceptual row:
a. change the row status to 'notInService',
b. change the values of the row
c. change the row status to 'active'"
::= { capwapDot11WlanBindEntry 3 }

-- End of capwapDot11WlanBindTable Table

-- Module compliance

capwapDot11Groups OBJECT IDENTIFIER
::= { capwapDot11Conformance 1 }

capwapDot11Compliances OBJECT IDENTIFIER
::= { capwapDot11Conformance 2 }

capwapDot11Compliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Describes the requirements for conformance to the

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

CAPWAP-DOT11-MIB module."

MODULE -- this module
MANDATORY-GROUPS {
capwapDot11WlanGroup,
capwapDot11WlanBindGroup
}
::= { capwapDot11Compliances 1 }

capwapDot11WlanGroup OBJECT-GROUP
OBJECTS {
capwapDot11WlanProfileIfIndex,
capwapDot11WlanMacType,
capwapDot11WlanTunnelMode,
capwapDot11WlanRowStatus
}
STATUS current
DESCRIPTION
"A collection of objects that is used to configure
the properties of a WLAN profile."
::= { capwapDot11Groups 1 }

capwapDot11WlanBindGroup OBJECT-GROUP
OBJECTS {
capwapDot11WlanBindWlanId,
capwapDot11WlanBindBssIfIndex,
capwapDot11WlanBindRowStatus
}
STATUS current
DESCRIPTION
"A collection of objects that is used to bind the
WLAN profiles with a radio."
::= { capwapDot11Groups 2 }

END

10. Security Considerations

There are a number of management objects defined in this MIB module
with a MAX-ACCESS clause of read-write and/or read-create. Such
objects MAY be considered sensitive or vulnerable in some network
environments. The support for SET operations in a non-secure
environment without proper protection can have a negative effect on
network operations. The following are the tables and objects and
their sensitivity/vulnerability:

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

o Unauthorized changes to the capwapDot11WlanTable and
capwapDot11WlanBindTable MAY disrupt allocation of resources in
the network, and also change the behavior of the WLAN system such
as MAC type.

SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPSec),
even then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the objects
in this MIB module.

It is RECOMMENDED that implementers consider the security features as
provided by the SNMPv3 framework (see [RFC3410], section 8),
including full support for the SNMPv3 cryptographic mechanisms (for
authentication and privacy).

Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.

11. IANA Considerations

11.1. IANA Considerations for CAPWAP-DOT11-MIB Module

The MIB module in this document uses the following IANA-assigned
OBJECT IDENTIFIER value recorded in the SMI Numbers registry:

Descriptor OBJECT IDENTIFIER value
---------- -----------------------
capwapDot11MIB { mib-2 195 }

11.2. IANA Considerations for ifType

IANA has assigned the following ifTypes:

Decimal Name Description
------- ------------ -------------------------------
252 capwapDot11Profile WLAN Profile Interface
253 capwapDot11Bss WLAN BSS Interface

12. Contributors

This MIB module is based on contributions from Long Gao.

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

13. Acknowledgements

Thanks to David Harrington, Dan Romascanu, Abhijit Choudhury, and
Elwyn Davies for helpful comments on this document and guiding some
technical solutions.

The authors also thank their friends and coworkers Fei Fang, Xuebin
Zhu, Hao Song, Yu Liu, Sachin Dutta, Ju Wang, Yujin Zhao, Haitao
Zhang, Xiansen Cai, and Xiaolan Wan.

14. References

14.1. Normative References

[IEEE.802-11.2007] "Information technology - Telecommunications and
information exchange between systems - Local and
metropolitan area networks - Specific
requirements - Part 11: Wireless LAN Medium
Access Control (MAC) and Physical Layer (PHY)
specifications", IEEE Standard 802.11, 2007, <htt
p://standards.ieee.org/getieee802/download/
802.11-2007.pdf>.

[RFC2119] Bradner, S., "Key words for use in RFCs to
Indicate Requirement Levels", BCP 14, RFC 2119,
March 1997.

[RFC2578] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578,
April 1999.

[RFC2579] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.

[RFC2580] McCloghrie, K., Perkins, D., and J.
Schoenwaelder, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.

[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces
Group MIB", RFC 2863, June 2000.

[RFC3418] Presuhn, R., "Management Information Base (MIB)
for the Simple Network Management Protocol
(SNMP)", STD 62, RFC 3418, December 2002.

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

[RFC5415] Calhoun, P., Montemurro, M., and D. Stanley,
"Control And Provisioning of Wireless Access
Points (CAPWAP) Protocol Specification",
RFC 5415, March 2009.

[RFC5416] Calhoun, P., Montemurro, M., and D. Stanley,
"Control and Provisioning of Wireless Access
Points (CAPWAP) Protocol Binding for IEEE
802.11", RFC 5416, March 2009.

[RFC5833] Shi, Y., Ed., Perkins, D., Ed., Elliott, C., Ed.,
and Y. Zhang, Ed., "Control and Provisioning of
Wireless Access Points (CAPWAP) Protocol Base
MIB", RFC 5833, May 2010.

14.2. Informative References

[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for
Internet-Standard Management Framework",
RFC 3410, December 2002.

[RFC4347] Rescorla, E. and N. Modadugu, "Datagram Transport
Layer Security", RFC 4347, April 2006.

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RFC 5834 CAPWAP Protocol Binding MIB May 2010

Authors' Addresses

Yang Shi (editor)
Hangzhou H3C Tech. Co., Ltd.
Beijing R&D Center of H3C, Digital Technology Plaza
NO. 9 Shangdi 9th Street, Haidian District
Beijing 100085
China

Phone: +86 010 82775276
EMail: [email protected]

David T. Perkins (editor)
228 Bayview Dr.
San Carlos, CA 94070
USA

Phone: +1 408 394-8702
EMail: [email protected]

Chris Elliott (editor)
1516 Kent St.
Durham, NC 27707
USA

Phone: +1 919-308-1216
EMail: [email protected]

Yong Zhang (editor)
Fortinet, Inc.
1090 Kifer Road
Sunnyvale, CA 94086
USA

EMail: [email protected]

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