Cisco wlc channel width best practice

The Catalyst Wireless solution is built on three main pillars of network excellence: Resiliency, Security, Intelligence:. This means that, although most AireOS features are retained, there might be changes in the way you configure certain functionalities.

This document covers the best practices recommended for configuring a typical Cisco Catalyst Series wireless infrastructure. The objective is to provide common settings that you can apply to most wireless network implementations. But not all networks are the same. Therefore, some of the tips might not be applicable to your installation.

Always verify them before you perform any changes on a live network. The first part of the document focuses on some important configuration and design concepts of the Catalyst Wireless Controller. These will be useful to understand the best practices presented in the rest of the document. The guide is a list of recommended configurations organized in sections: General, Network, Radio Frequency RFSecurity settings and more.

When available, these settings are shown using the new Graphical User Interface GUI of the Catalystas it has been greatly improved and should be easy to navigate. In the next popup window select Show Diff. This will open up another window where you can compare the existing and new configuration. The commands that are different are highlighted: green indicates new commands, orange modified commands, and red deleted commands.

Below is an example for a new rogue management setting. Each recommended setting will be highlighted if there are some known restrictions or if it applies to a specific release of code. The differences with AireOS will also be underlined. The information in this document is derived from tests on devices in specific lab environments. All of the devices used in this document started with a cleared default configuration.

If your network is live, make sure that you understand the potential impact of any command. More information can be found here. The information in this document is based on the following software and hardware versions:. Cisco Catalyst Series new configuration model. A quick recap first. The Cisco Catalyst Series new configuration model is based on two constructs: profiles and tags.

Profiles group a set of features and functionalities, and tags allow you to assign these features and functionalities to APs. There are five types of profiles:. The tag allows you to bind the settings in the profiles to an access point.

There are three types of tags:. An access point is always assigned three tags, one for each type. If a tag is not explicitly defined, the AP will get the default policy, site, or RF tag. The C configuration model allows the customer to have much more flexibility in tweaking the configuration to fit a specific wireless deployment.

With the new configuration model, the TCP MSS Adjust value is set at the AP Join profile level, so the customer can evaluate the transport network at each site and decide the value that is best for a specific group of APs.They are used in a fairly densely packed office with a peak count of clients reaching to around but they are not evenly divided and some APs might peak at 40 clients.

What exactly is considered by the channel width algorithm. I would consider the environment fairly high noise as it's a floor in an office building in a central part of town hundreds of rogues detected and from most literature I've found that the recommended width is 20 MHz in this type of setting.

I haven't really received any negative user feedback yet but it's only been running for two days this way. In my opinion you really need to look at the channel utilization in your office. If it's high, then reduce he channel width. In many of our high density sites, we still use 20mhz or 40mhz but never a mix and match.

You must have the DCA set to "Best". As far as client per AP. Roaming is a decision on he client side. Oh well, I'll probably do away with the Best Practice suggestion for "Best" channel width. The reason I don't or prefer using "Best" is because you don't know if client devices will prefer 40mhz or 80mhz or mhz over the lower bonded channels. This would mean that if clients do prefer the higher bonded, that your client to AP distribution would skewed. That is why I prefer that all AP's use the same channel width so that I don't have to worry about oversubscribed AP's if that makes sense.

Data rates is important to good RF health. If you ever have user say, "why is my signal low when I'm right under an AP", well it's be cause you are allowing the lower data rates.

You remove lower rates to reduce the coverage, making the client device roam to another AP. You are getting wider channels in a high noise environment because the faster the clients transmit, the faster they free up airtime for others to transmit and thus reduce the overall noise.

Think of 80mhz channels like you are applying a. If you have 10 clients all trying to upload 1gb, but you turned on 80mhz and 7 of them got their 1gb file zipped down to mb, well. Buy or Renew. Find A Community.Last Modified: September, Mobility has rapidly changed how we use, and what we expect of wireless network resources. Wireless has become the preferred option for users to access the network, and in a lot of cases the only practical one.

This document offers short configuration tips that cover common best practices in a typical Wireless Unified Infrastructure. The objective is to provide important notes that you can apply on most wireless network implementations. Note Not all networks are equal. Therefore, some tips might not be applicable on your installation. Always verify them before you perform any changes on a live network.

Cisco recommends that you have knowledge of these topics:. The information in this document is based on these software and hardware versions:. The information in this document was created from the devices in a specific lab environment.

All of the devices used in this document started with a cleared default configuration. If your network is live, ensure that you understand the potential impact of any command. This is a summary table for best practices recommended in this document. Please refer to individual sections for additional details.

Cisco Catalyst 9800 Series Configuration Best Practices

The CT currently ships with release 3. You can check this using the following command:. It is recommended to upgrade to software release 3. Latest software codes are available on cisco.

It is best practice to go through the release notes before upgrading to that software code. For the purpose of this document, CLI commands were used to make the configurations.

WLC Advanced UI Series 03 - AP Performance and Client Summary

However, most of the changes mentioned in this document can be done using the GUI. For best GUI experience, it is best practice to follow the steps:. Use the list of supported browsers:. Upgrade the controller to the latest software version that has additional features and GUI support.

You will need to create a user name and password to access the GUI.Mobility has rapidly changed the expectation of wireless network resources and the way users perceive it. Wireless has become the preferred option for users to access the network, and in many cases the only practical one.

The objective of this document is to provide important notes that you can apply on most wireless network implementations. Not all networks are the same. Therefore, some of the tips might not be applicable on your installation.

Always, verify them before you perform any changes on a live network. The information in this document was based on these software and hardware versions:. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.

If your network is live, make sure that you understand the potential impact of any command. It is mandatory to reload the controllers after you change these configuration settings:. Configuration files may contain sensitive data. If you want to ensure password confidentiality, use the transfer upload encrypted file feature when doing configuration backups from the controller.

In case of a controller crash, it is possible to enable automated upload of core dump for analysis to a FTP server, this file can be provided to TAC for further analysis. By default this feature is enabled. How to configure :. To validate the configuration :. This should be used in most scenarios to facilitate data gathering in case of unexpected controller reload. In recent releases 8. This will provide a bundle covering crash information, core files, configuration, RRM logs, and RF state data.

It is advisable to always include this file when opening a TAC case, to have a good starting data set. How to Upload proceed with file upload mode as needed.

cisco wlc channel width best practice

It is recommended to use restart instead of reset system for the following scenarios to reduce network and service downtime and provide better serviceability:. Bonjour, an Apple's service discovery protocol, locates devices such as printers, other computers, and the services that those devices offer on a local network using multicast Domain Name System mDNS service records.

Bonjour is a link local protocol that does not cross L3 boundaries. With Bonjour gateway, Apple devices can discover Bonjour services across a layer 3 boundary across different VLANs without additional configuration on the end user device s.

Using a mDNS gateway can reduce significantly the amount of multicast traffic flooded across the wireless network, as the responses are handled directly as unicast towards the device sending them, optimizing the use of RF time. This should be used in most scenarios. It should only be disabled when there is some interoperability issue with end devices, or when another local mDNS gateway is present, external to the WLC.

From a security point of view, it is preferable the disable option, as there is full confirmation of all client state is deleted before it is allowed on another WLAN, that may have different security policies. The enable option is advisable when Apple IOS clients are present, as these devices do not work properly with the "delete on WLAN change" behavior, and they may have the currently associated AP in a blocked list. This should be used in most scenarios to have it enabled for better interoperability.

Whenever allowed by the controller hardware type in use, it is advisable to take advantage of the HA SSO feature, to reduce any possible downtime in case of failure. If load balancing is required on the WLAN, ensure that the controller has a global windows set to 5 clients or higher, to prevent association errors.

This should be used in most scenarios when Load Balancing feature is in use. For large high density deployments, it is advisable to modify the default aggregate probe interval sent by access points. By default, the APs will update every ms about the probes sent by clients, this information is used by load balancing, band select, location and If there is a large number of clients and access points, it is advisable to modify the update interval, to prevent control plane performance issues in the WLC.We recommend limiting the number of service set identifiers SSIDs configured at the controller.

This results in lockups, reloads, or association failures. Description—Band Selection should be enabled. Clicking Fix it Now enables Band Selection.

Cisco Wireless LAN Controller (WLC) Configuration Best Practices

Band selection works by regulating probe responses to clients. It makes 5 GHz channels more attractive to clients by delaying probe responses to clients on 2. Evaluate band selection for voice, particularly focusing on roaming performance. See below for further explanation. Also, in high-density designs, the study of available UNII-2 channels should be made. Dual-band roaming can be slow depending on the client.

cisco wlc channel width best practice

If a majority of the base of voice clients exhibits a slow roaming behavior, it is more likely that the client sticks to 2. In this case, it has scanning issues on 5 GHz. Generally when a client decides to roam, it scans its current channel and band first. Failing such available connection, the client may remain with its current AP. In this case, if the CU on 2. However, the preferred design is to enable band selection on 5 GHz with all data rates enabled and 6 Mbps as mandatory.

The goal of this configuration recommendation is to enable the client to obtain a band and channel with better SNR and Tx power initially.

cisco wlc channel width best practice

As already stated, generally when a client decides to roam, it scans its current channel and band first. So, if the client initially joins the 5 GHz band, then it is more likely to stay on the band if there are good power levels on 5 GHz. SNR levels on 5 GHz are generally better than 2. This enables all 11k enabled clients to have the benefit of assisted roaming. With dual-band reporting enabled, the client receives a list of the best 2.

Here, the client most likely looks at the top of the list for an AP on the same channel, and then on the same band as the client is currently on. This logic reduces scan times and saves battery power. Having The country is absolutely beautiful. The people are wonderful. We had an amazing time and would like to come back and see the country in the wintertime. We had a great experience from the very beginning.

Cisco 5760 IOS Wireless LAN Controller Configuration Best Practices

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