Wireless LAN Controller (WLC) Lecture Notes

Introduction

• Today's session is about WLC, which stands for Wireless LAN Controller.
• Key topics covered:
  • What is WLC?
  • The role and function of WLC.
  • Why are WLCs required?

What is WLC?

• A network device that manages wireless network access points.
• Allows wireless devices to connect to the network.

Role and Function of WLC

• Management of Access Points:

  • Organizations often have multiple access points (APs) across different locations (rooms, floors, buildings).
  • In large networks, a single AP is insufficient due to the high number of users.

• Seamless Connectivity:

  • Users expect seamless wireless connections while moving around (roaming).
  • Roaming allows devices to switch from one AP to another without losing connection.

• Centralized Control:

  • WLC centralizes the management of access points (APs).
  • Typically installed as software on a server or as a dedicated appliance.
  • Provides a single pane of glass for monitoring and managing the network.

• Management Tasks:

  • Authentication, roaming, and creation of new wireless networks are handled by the WLC.
  • Simplifies deployment of new APs (plug-and-play configuration).

• Configuration Changes:

  • Configuration changes can be made in one place and pushed to all APs.

Lightweight Access Points (LWAP)

• Access points managed by WLC are referred to as Lightweight Access Points (LWAP).
• The main objective is to centralize control while APs focus on forwarding traffic.

Performance Monitoring

• WLC provides statistics and performance information for the wireless network.
• Includes reporting mechanisms for long-term performance evaluation.

Important Protocols

• LWAPP (Lightweight Access Point Protocol):
  • Used to manage LWAPs between WLC and AP.
  • Essential for network administrators to manage large quantities of APs.

Interesting Fact

• Despite the name "Wireless LAN Controller", WLCs connect to wired LAN and APs via wired connections only.

Conclusion

• WLC enhances ease of access, management, and reduces errors in wireless networks.
• Next session will cover Cisco DNA Center Controller.

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