This MIB is intended to be implemented on all those
devices operating as Central controllers, that
terminate the Light Weight Access Point Protocol
tunnel from Cisco Light-weight LWAPP Access Points.

Information provided by this MIB is about the
configuration and monitoring of 802.11 wireless
clients in the network.

The relationship between CC and the LWAPP APs
can be depicted as follows:

+......+     +......+     +......+           +......+
+      +     +      +     +      +           +      +
+  CC  +     +  CC  +     +  CC  +           +  CC  +
+      +     +      +     +      +           +      +
+......+     +......+     +......+           +......+
..            .             .                 .
..            .             .                 .
.  .            .             .                 .
.    .            .             .                 .
.      .            .             .                 .
.        .            .             .                 .
+......+ +......+     +......+      +......+          +......+
+      + +      +     +      +      +      +          +      +
+  AP  + +  AP  +     +  AP  +      +  AP  +          +  AP  +
+      + +      +     +      +      +      +          +      +
+......+ +......+     +......+      +......+          +......+
.              .             .                 .
.  .              .             .                 .
.    .              .             .                 .
.      .              .             .                 .
.        .              .             .                 .
+......+ +......+     +......+      +......+          +......+
+      + +      +     +      +      +      +          +      +
+  MN  + +  MN  +     +  MN  +      +  MN  +          +  MN  +
+      + +      +     +      +      +      +          +      +
+......+ +......+     +......+      +......+          +......+

The LWAPP tunnel exists between the controller and
the APs.  The MNs communicate with the APs through
the protocol defined by the 802.11 standard.

LWAPP APs, upon bootup, discover and join one of the
controllers and the controller pushes the configuration,
that includes the WLAN parameters, to the LWAPP APs.
The APs then encapsulate all the 802.11 frames from
wireless clients inside LWAPP frames and forward
the LWAPP frames to the controller.

                   GLOSSARY

Access Point ( AP )

An entity that contains an 802.11 medium access
control ( MAC ) and physical layer ( PHY ) interface
and provides access to the distribution services via
the wireless medium for associated clients.  

LWAPP APs encapsulate all the 802.11 frames in
LWAPP frames and sends them to the controller to which
it is logically connected.

Basic Service Set ( BSS ) 

Coverage area of one access point is called a BSS. An 
access point (AP) acts as a master to control the 
clients within that BSS. 

Clear To Send (CTS)

Refer to the description of RTS.                

Light Weight Access Point Protocol ( LWAPP ) 

This is a generic protocol that defines the 
communication between the Access Points and the
Central Controller.


MAC Service Data Units ( MSDU )

The MSDU is that unit of data received from 
the logical link control ( LLC ) sub-layer which lies
above the medium access control ( MAC ) sub-layer in a
protocol stack. 

Message Integrity Code ( MIC )

A value generated by a symmetric key cryptographic 
function. If the input data are changed, a new value 
cannot be correctly computed without knowledge of the
symmetric key. Thus, the secret key protects the input 
data from undetectable alteration.

Mobile Node ( MN )

A roaming 802.11 wireless device in a wireless
network associated with an access point. Mobile Node,
Mobile Station(Ms) and client are used 
interchangeably. 

Request To Send ( RTS )

A client wishing to send data initiates the process by
sending a Request To Send (RTS) frame. The destination
client replies with a Clear To Send (CTS) frame.

Wireless local-area network ( WLAN )
A local-area network that uses high-frequency radio 
waves rather than wires to communicate between nodes.

Service Set Identifier (SSID)
A service set identifier is a name that identifies a particular
802.11 wireless LAN. A client device receives broadcast messages
from all access points within range advertising their SSIDs. The
client device can then either manually or automatically based on
configuration select the network with which to associate. The
SSID can be up to 32 characters long.

Hybrid Remote Edge Access Point (HREAP)
HREAP is a wireless solution for branch office and remote office
deployments. It enables customers to configure and control
access points in a branch or remote office from the corporate
office through a wide area network (WAN) link without deploying
a controller in each office.  

Workgroup Bridge ( WGB )
A WGB can provide a wireless infrastructure connection
for a Ethernet-enabled devices. Devices that do not have
a wireless client adapter in order to connect to the
wireless network can be connected to a WGB through 
Ethernet port.

KTS (Key Telephone System)

	Key Telephone System is an alternative to a private branch exchange (PBX) 
	phone system. A KTS is equipped with several buttons that allow a caller to
	directly select outgoing lines or incoming calls, and use intercom and 
	conference facilities. 

REFERENCE

[1] Wireless LAN Medium Access Control ( MAC ) and
Physical Layer ( PHY ) Specifications 

[2] Draft-obara-capwap-lwapp-00.txt, IETF Light 
Weight Access Point Protocol