This module defines textual conventions used
throughout the Cisco enterprise MIBs
designed for implementation on Central 
Controllers that terminate the Light Weight
Access Point Protocol from LWAPP Access
Points. 

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 it to the controller to which
it is logically connected.

Advanced Encryption Standard ( AES )

In cryptography, the Advanced Encryption Standard
(AES), also known as Rijndael, is a block cipher
adopted as an encryption standard by the US
government. It is expected to be used worldwide
and analysed extensively, as was the case with its
predecessor, the Data Encryption Standard (DES).
AES was adopted by National Institute of Standards
and Technology (NIST) as US FIPS PUB 197 in
November 2001 after a 5-year standardisation
process.

Central Controller ( CC )

The central entity that terminates the LWAPP protocol
tunnel from the LWAPP APs.  Throughout this MIB,
this entity is also referred to as 'controller'.

Light Weight Access Point Protocol ( LWAPP )

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

Management Frame Protection ( MFP )

A proprietary mechanism devised to integrity protect
the otherwise unprotected management frames of the
802.11 protocol specification.

Message Integrity Check ( MIC )

A checksum computed on a sequence of bytes and made
known to the receiving party in a data communication,
to let the receiving party make sure the bytes
received were not compromised enroute.

Mobile Node ( MN )

A roaming 802.11 wireless device in a wireless
network associated with an access point.

Temporal Key Integrity Protocol ( TKIP )

A security protocol defined to enhance the limitations
of WEP.  Message Integrity Check and per-packet keying
on all WEP-encrypted frames are two significant
enhancements provided by TKIP to WEP.

Wired Equivalent Privacy ( WEP )

A security method defined by 802.11. WEP uses a
symmetric key stream cipher called RC4 to encrypt the
data packets.

802.11n

802.11n builds upon previous 802.11 standards by 
adding MIMO (multiple-input multiple-output). MIMO 
uses multiple transmitter and receiver antennas to 
allow for increased data throughput through spatial 
multiplexing and increased range.

Control/Extension Channel 

A single 802.11 channel is 20 MHz wide.  802.11n allows 
the use of channels of width 40 MHz by combining two 
20 MHz channels.  The channels are known as the primary 
or control channel and secondary or extension channel. 
Both the channels are used for transmission 
and reception of data.

REFERENCE

[1] Part 11 Wireless LAN Medium Access Control ( MAC )
    and Physical Layer ( PHY ) Specifications.

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

[3] Enhanced Wireless Consortium MAC Specification, 
    v1.24.

[4] Enhanced Wireless Consortium PHY Specification,
    v1.27.