Campus lan and Wireless lan solution Design Guide

 
Local-mode design model 
Figure 28. 
A centralized architecture uses the controller as a single point for managing Layer 2 security and wireless 
network policies. It also enables services to be applied to wired and wireless traffic in a consistent and 
coordinated fashion. 
The local-mode design model meets the following organization demands: 
● 
Seamless mobility
—Enables fast roaming across the campus, so that users remain connected to their 
session even while walking between various floors or adjacent buildings with changing subnets 
● 
Ability to support rich media
—Enhances robustness of voice with call admission control and multicast 
with Cisco VideoStream technology 
● 
Centralized policy
—Enables intelligent inspection through the use of firewalls, as well as application 
inspection, network access control, policy enforcement, and accurate traffic classification 
If 
any
of the following are true at a site, you should consider deploying a controller locally at the site:
● 
The site has a data center. 
● 
The site has a LAN distribution layer. 
● 
The site has more than 100 APs. 
● 
The site has a WAN latency greater than 100ms round-trip to a proposed shared controller. 
The recommended platforms for large centralized (local-mode) designs are the Cisco Catalyst 9800-80 and 
9800-40 WLAN controllers, because of their scalability and feature support. For smaller sites, you can deploy 
the Cisco 9800-L WLAN controller as a local controller within the site. The Cisco Catalyst 9800-CL virtual form 
factor deployed within a private cloud is another alternative and includes the same feature set as the Cisco 
Catalyst 9800 Series appliances.

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