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Cisco Wireless LAN Controller Configuration Guide
OL-8335-02
Chapter 1 Overview
Wireless LAN Controller Platforms
• 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 Cisco 1000 series lightweight
access point has no Primary, Secondary, and Tertiary Cisco Wireless LAN Controllers assigned and
there is no master Cisco Wireless LAN Controller active, it attempts to associate with the
least-loaded Cisco Wireless LAN 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.
Cisco Wireless LAN Controller Automatic Time Setting
Each controller can have its time manually set or can be configured to obtain the current time from one
or more Network Time Protocol (NTP) servers. Each NTP server IP address is added to the controller
database. Each controller searches for an NTP server and obtains the current time upon reboot and at
each user-defined polling interval (daily to weekly).
Cisco Wireless LAN Controller Time Zones
Each Cisco Wireless LAN Controller can have its time zone manually set or can be configured to obtain
the current time from one or more Network Time Protocol (NTP) servers. Each NTP server IP address
is added to the Cisco Wireless LAN Controller database. Each Cisco Wireless LAN Controller can
search for an NTP server and obtain the current time zone upon reboot and at each user-defined (daily
to weekly) polling interval.
Network Connections to Cisco Wireless LAN Controllers
Regardless of operating mode, all Cisco Wireless LAN 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 Series Wireless LAN Controllers, page 1-16
• Cisco 4100 Series Wireless LAN Controllers, page 1-16
• Cisco 4400 Series Wireless LAN Controllers, page 1-17
Note Chapter 3 provides information on configuring the controller’s ports and assigning interfaces to them.