This MIB is intended to be implemented on all those
devices operating as Central Controllers (CC) that
terminate the Light Weight Access Point Protocol
tunnel from Light-weight LWAPP Access Points.
        
This MIB provides configuration and status information
about the 802.11 WLAN mobility.                 
        
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.
        
        
   Basic Service Set Identifier (BSSID)
        
   The identifier for the service set comprising of
   all the 802.11 stations under the control of
   one coordinating Access Point.  This identifier
   happens to be the MAC address of the dot11 radio
   interface of the Access Point.  The wireless
   clients that associate with the Access Point
   get the wired uplink through this particular 
   dot11 interface. 
        
        
   Central Controller ( CC )
        
   The central entity that terminates the LWAPP protocol
   tunnel from the LWAPP APs.  Throughout this MIB,
   this entity 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. 
        
        
   Mobility Oracle (MO)
        
   When a Central Controller in the Mobility Group is 
   designated as Mobility Oracle, then all the Mobility 
   Controller's (MC) traffic is tunnelled to it by other
   Mobility Controllers. Currently, MO resides along with MC
   but MC can reside in a box without MO.
        
        
   Mobility Controller (MC)
        
   When a Central Controller in the Mobility Group is 
   designated as Mobility Controller, then all the Mobile 
   Anchor's traffic is tunnelled to it by other Anchors.
   Each MC has its own/self mobility agent (MA), but MA can
   reside in a box without MC.
        
        
   Mobility Agent (MA)
        
   The Mobility Agent is an entity residing on the access 
   switch that manages mobility events on the switch, and 
   communicates with the Mobility Controller. Access Points
   can associate directly with MA.
        
        
   Wireless LAN Controller (WLC)
        
   Wireless LAN Controller are legacy mobility device which 
   can participate in the new mobility architecture.
        
        
   Mobility Manager
        
   The Mobility Manager is the management entity in a mobility
   controller or mobility agent.
        
        
   Mobile Node ( MN )
        
   A roaming 802.11 wireless device in a wireless
   network associated with an access point. 
        
        
   Anchor MC, Anchor MA
        
   Anchor MC or Anchor MA is the mobility entity where a mobile
   client was first anchored or associated. This is equivalent 
   to home agent (HA).
        
        
   Associated MC, Associated MA
        
   Associated MC or Associated MA is the mobility entity where 
   a mobile client roamed and get associated. This is equivalent
   to foreign agent (FA). It can be local or remote.
        
        
   Mobility 
        
   Concept by which a Mobile Node can roam from one 
   Access Point to another Access Point, across multiple
   Central Controllers, without need for repeated 
   authentication. 
        
        
   Mobility Group
        
   A set of Central Controllers which exchange Mobile 
   Node's authentication information, so that the Mobile
   Node upon roaming need not re-authenticate.  
        
        
   Switch Peer Group (SPG)
        
   A set of mobility agents (MAs) form a Switch Peer Group.
   One or more SPGs are associated with one mobility 
   controller (MC). Traffic between mobility agents within
   a SPG group goes directly between them - not through their
   associated MC
        
        
   Mobility Anchor
        
   When a Central Controller in the Mobility Group is 
   designated as Mobility Anchor, then all the Mobile 
   Node's traffic is tunnelled to it by other
   Controllers in the Mobility Group.
        
        
   Guest Tunneling (GT)
        
   The concept of designating a Central Controller in 
   the Mobility Group as Mobility Anchor, so that all
   the Mobile Node's traffic is tunnelled to it by other
   Controllers in the Mobility Group.              
        
        
   Station Management (SMT)
        
   This term refers to the internal management of the
   802.11 protocol operations by the AP to work
   cooperatively with the other APs and 802.11
   devices in the network.
        
        
   Ethernet over Internet Protocol (EoIP)
        
   Ethernet over IP (EoIP) is a protocol that creates 
   an Ethernet tunnel between two routers on top of an
   IP connection. The EoIP interface appears as an 
   Ethernet interface.
        
        
   Reverse path filtering (RPF) 
        
   Reverse path filtering (RPF) is a feature provided
   by most modern Internet Protocol routers, which may
   be used to reduce the risk of customers attacking
   other internet hosts. One of the problems network
   service providers face today is hackers generating
   packets with fake source IP addresses, a technique
   known as spoofing. This is often done in order to
   initiate a denial-of-service attack against another
   internet host or network.
   Since the source IP addresses of the incoming packets
   change, often randomly, and for every packet, the
   target of such an attack can't easily filter out the
   attacking packets. However, the source of the attack,
   i.e. the network service provider of the attacking 
   host, has a simple way to stop such packets from ever
   leaving its network. A router always knows which 
   networks are reachable via any of its interfaces. 
        
   By checking the source IP address of all packets 
   coming in via an interface against the networks known
   to be behind that interface, the router can simply 
   drop packets that aren't supposed to come from there.
        
   Hence, reverse path filtering filters packets 
   according to the 'reverse path' to their source 
   IP address. If the path back to the source IP address 
   does not match the path the packet is coming from,
   it is dropped.
        
   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.