Deploying and Troubleshooting Cisco Wireless LAN Controllers

Troubleshooting on the WLC (Cisco Wireless LAN Controllers) Part 1

The purpose of this topic is to educate you about the options and possibilities for troubleshooting wired and wireless issues within your deployments. This also makes it easier for you to formulate a troubleshooting plan. It might even provide seasoned engineers with new options in troubleshooting their everday issues in a fresh manner. The Wireless […]

Troubleshooting on the WLC (Cisco Wireless LAN Controllers) Part 2

mping and eping Controllers in a mobility list communicate with each other by controlling information over a well-known User Datagram Protocol (UDP) port and exchanging data traffic through an EoIP tunnel. Because UDP and EoIP are not reliable transport mechanisms, a mobility control packet or data packet is not guaranteed to be delivered to a […]

Statistics (Cisco Wireless LAN Controllers)

As far as statistics go, these are not as heavily utilized as those on a router or a switch interface. As newer versions come out, vast improvements and new additions are being made to this area. You can find all these categories under the MONITOR tab and under Statistics on the left menu. Controller Statistics […]

RADIUS Server Statistics (Cisco Wireless LAN Controllers)

The RADIUS Server Statistics page is another informative page to notify you of a failed link or RADIUS server. The statistics on this page can indicate whether aggressive RADIUS-failover would be an issue. To configure the controller to mark a RADIUS server as down (not responding) after the server does not reply to three consecutive […]

WLC Config Analyzer (Cisco Wireless LAN Controllers)

Another tool developed by a Cisco Wireless Engineer, Javier Contreras Albesa, is the WLC Config Analyzer. It is located at the Cisco Support Wiki at http://tinyurl.com/45jvph. The goal of this tool was to save as much time as possible while processing long and related WLC config files. You can use this tool to detect basic […]

Software Bug Toolkit (Cisco Wireless LAN Controllers)

Whenever software is created, human error is possible. The result of this error is software bugs. These bugs can be critical in any deployment, and it is key that you know as much as possible so you can compensate and adjust accordingly to avoid any service impact or degeneration. The software bug toolkit is an […]

Connecting the WLC to the Switch

A distribution system port connects the controller to a neighbor switch and serves as the data path between these two devices. This topic discusses a few common methods on the models that have these options. Cisco 4402 controllers have two Gigabit Ethernet distribution system ports, each of which is capable of managing up to 48 […]

LAG (Cisco Wireless LAN Controllers)

LAG is a partial implementation of the 802.3ad port aggregation standard. It bundles all the ports of the controller into a single 802.3ad port channel. The controller manages redundancy and load balancing of all the APs across the ports. See Figure 7-4 for an example of LAG implemented in a network. LAG does make managing […]

DHCP Proxy Vs. DHCP Bridging (Cisco Wireless LAN Controllers)

One of the biggest questions that is asked is how does the controller handle DHCP, in earlier versions, and what is the difference between DHCP proxy and bridging in the newer versions. WLC supports two modes of DHCP operations in case an external DHCP server is used, DHCP proxy mode and DHCP bridging mode. The […]

Overview and Configuration (Cisco Wireless LAN Controllers)

If the APs reside in a different subnet than the WLC, you must implement one of these methods to allow WLC discovery: ■ Use DHCP with Option 43. ■ Use DNS entry CISCO-LWAPP-CONTROLLER.localdomain to resolve the management IP address of the WLC. ■ Prime the AP. The Cisco 1000 Series APs use a string format […]

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