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Cisco Wireless LAN Controller Configuration Guide
OL-9141-03
Chapter 3 Configuring Ports and Interfaces
Configuring a 4400 Series Controller to Support More Than 48 Access Points
Configuring a 4400 Series Controller to Support More Than 48
Access Points
As noted earlier, 4400 series controllers can support up to 48 access points per port. When the limit is
reached and another access point tries to register with the controller, the following error message is
generated:
Error: AP cannot join because the maximum number of APs on interface 1 is reached.
However, you can configure your 4400 series controller to support more access points using one of the
following methods:
• Link aggregation (for controllers in Layer 3 mode), see page 3-36.
• Multiple AP-manager interfaces (for controllers in Layer 3 mode). A single AP manager interface
supports upto 48 access points, but multiple AP manager interfaces allows more than 48 access
points to be registered with the controller. See page 3-36.
• Connecting additional ports (for controllers in Layer 2 mode), see page 3-41.
Follow the instructions on the page indicated for the method you want to use.
The following factors should help you decide which method to use if your controller is set for Layer 3
operation:
• With link aggregation, all of the controller ports need to connect to the same neighbor switch. If the
neighbor switch goes down, the controller loses connectivity.
• With multiple AP-manager interfaces, you can connect your ports to different neighbor devices. If
one of the neighbor switches goes down, the controller still has connectivity. However, using
multiple AP-manager interfaces presents certain challenges (as discussed in the “Using Multiple
AP-Manager Interfaces” section below) when port redundancy is a concern.
Using Link Aggregation
See the “Enabling Link Aggregation” section on page 3-29 for more information and instructions on
enabling link aggregation.
Note Link aggregation is the only method that can be used for the Cisco WiSM and Catalyst 3750G Integrated
Wireless LAN Controller Switch controllers.
Using Multiple AP-Manager Interfaces
Note This method can be used only with Cisco 4400 series stand-alone controllers.
When you create two or more AP-manager interfaces, each one is mapped to a different port (see
Figure 3-14). The ports should be configured in sequential order such that AP-manager interface 2 is on
port 2, AP-manager interface 3 is on port 3, and AP-manager interface 4 is on port 4.
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