1-17
Cisco Wireless LAN Controller Configuration Guide
OL-9141-03
Chapter 1 Overview
Pico Cell Functionality
• If the lightweight access point has a primary, secondary, and tertiary controller assigned, it attempts
to associate with that controller.
• If the access point has no primary, secondary, or tertiary controllers assigned or if its primary,
secondary, or tertiary controllers are unavailable, it attempts to associate with a master controller on
the same subnet.
• If the access point finds no master controller on the same subnet, it attempts to contact stored
mobility group members by IP address.
• Should none of the mobility group members be available, and if the lightweight access point has no
primary, secondary, and tertiary controllers assigned and there is no master controller active, it
attempts to associate with the least-loaded controller on the same subnet to respond to its discovery
messages with unused ports.
This means that when sufficient controllers are deployed, should one controller fail, active access point
client sessions are momentarily dropped while the dropped access point associates with an unused port
on another controller, allowing the client device to immediately reassociate and reauthenticate.
Network Connections to Cisco Wireless LAN Controllers
Regardless of operating mode, all controllers use the network as an 802.11 distribution system.
Regardless of the Ethernet port type or speed, each controller monitors and communicates with its
related controllers across the network. The following sections give details of these network connections:
• Cisco 2000 and 2100 Series Wireless LAN Controllers, page 1-17
• Cisco 4400 Series Wireless LAN Controllers, page 1-18
Note Chapter 3 provides information on configuring the controller’s ports and assigning interfaces to them.
Cisco 2000 and 2100 Series Wireless LAN Controllers
Cisco 2000 and 2100 series controllers can communicate with the network through any one of their
physical data ports, as the logical management interface can be assigned to one of the ports. The physical
port description follows:
• Up to four 10/100BASE-T cables can plug into the four back-panel data ports on the 2000 series
controller chassis.
• Up to six 10/100BASE-T cables can plug into the six back-panel data ports on the 2100 series
controller chassis. The 2100 series also has two PoE ports (ports 7 and 8).
Figure 1-4 shows connections to a 2000 series controller.
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