Cisco 8540 Wireless Controller vs. Cisco Catalyst 9800 Series Wireless Controllers

[Cisco 8540 Wireless Controller's] software quality has been shed in recent years. The only problem I have with it is its inability to work with older Cisco Access Points. However, that's to be expected for any deployment. While the controller's UI works well, some areas could be improved. API integrations lack flexibility. [I feel] it's time for policy redesign. It can be a little difficult to determine coding quality.

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Well suited for most of our customer base because it is a versatile, scalable, large multi-campus organizations. Not so: Brandish deployments where there's a much more simplified feature set needed. So where we can basically rely on Meraki as a cloud base with easier to deploy.

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• The GUI on the Cisco 8540 WLC is much better designed than other Cisco products. Its easy to navigate between the different settings to find what is needed.
• The AP groups allows touching multiple APs at one time.
• It also allows us to create standard SSIDs that can be used at all sites that connect back to it, this saves a lot of time instead of hitting each site with a local controller.

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• I think the updates are great. ISSU upgrading code is fantastic. I think the speed with which CAPWAP converges or reconverges, I think the redundancy mechanisms for roaming APs to other controllers is very good. I think overall, getting away from more of a monolithic processor where subprocesses handle what they call the WNCD tasks, I think fundamentally is an improvement in performance.
• The radioactive tracing, all of the troubleshooting and all of the logging and all of the importing and exporting features for logging and analytics within the controller itself is really, really good compared to the predecessor AireOS.

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• Code quality is a bit hit and miss. This will be great for a while, then things will be bad for a while, then we'll do it again. The UI of the controller works, but could do with a refresh, and I would like to see some improvement on layout and organization.
• The constant code/firmware upgrades and the QA of new code could be better.
• Maybe the compatibility with old Cisco Access Points could be improved, but it's normal in all kinds of deployments.

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• The biggest issues we have had have been software related. Requiring code upgrades or reloads to fix an unfixable problem.
• Some of the troubleshooting utilities aren't perfectly clear as to what theyre doing or how to set them up or what to expect results wise or resource wise.
• I think there is a lack of filtering in certain displays where you cannot use the "contains" option for certain device type filtering. But those options should be universal in all views.

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Despite common software and hardware issues this is still the best product on the market for large scale enterprise deployments. Cisco has worked with us extensively to reduce the amount of bugs in every iteration however new bugs are introduced or new incompatibilities always arise with major releases. Thus, while I'm hesitant to recommend the product it's still much better than all the other competitors such as Aruba and Juniper in the WIFi space. There is also extensive integration with DNAC/Catalyst Center and ISE in an SDA deployment. Recently there has been a number of critical issues with the controller software and Cisco has proved themselves to be incapable of timely troubleshooting and diagnosis. This has reduced our confidence in the product and it's current and future stability and maintainability. At it's current state the product is taking up too much of our engineering resources to maintain despite also paying for premium support from Cisco. As such I have reduced by rating as we are likely to look at alternative vendors for our long-term wireless management solution

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Very feature rich, easy enough for beginners to understand layout and initial setup. Need a good training (online, Cisco Leaning Network, etc.) to fully understand all features and product capabilities. Strict power requirements for APs are only major drawback for our specific implementation.

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It's not simple, but this is the result of being very deeply configurable

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Honestly, in the six years that we've been using it, we've had one, I would say show stopping event. There was an issue with in an HA setup they would every so often when rebooted lose all configuration. So that was a bit disappointing, required quite a few hours to resolve, but Cisco had to fix very quickly and once we implemented that, we've not had any further additional issues.

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We have been using the Cisco Catalyst 9800 Series Wireless Controllers for over 2 years and the whole system has been very stable. We currently run them in HA and have found when this has been activated (due to power issues etc.) the units change roles seamlessly, minimising the downtime to almost nothing. Except when we have had major issues, our wireless networks have a solid uptime and keeps our whole borough up 24/7 without problems.

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It is a better product. The evolution is positive.

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the overall support on the 9800 Wireless lan controller is good. Wireless issues are sometimes hard to troubleshoot since it's the RF that make it complex and the diversity in clients and requirements. The engineers do a good job in understanding the scope and issue, altough not all issues can be solved

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You need to understand wifi basics

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We have [done] some work before with the Cisco 3504 product, but the more recent Cisco 8540 Wireless Controller provides a wider range of capabilities for managing the wireless network and each individual device [and] also being able to handle more users. Unfortunately, we didn't test and deploy equivalent products from other concurrent companies.

Ubiquiti WLAN is very much a consumer platform. It is not production ready, it is buggy, it has issues. It is cheaper than Cisco, but you get what you pay for. Aruba doesn't integrate nicely with our existing largely Cisco based networks, so when time came to replace AireOS, the Cisco Catalyst 9800 Series Wireless Controllers came out on top.

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There are different vesrions for different requirements, there's HA as well.

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• The Cisco 8540 Wireless Controller allows you to reduce your hardware footprint of wireless controllers deployed in your environment. Instead of having a controller per site deployed, you can have a couple of 8540 controllers in your data center that can handle up 6000 Access Points.
• Some of the savings on hardware cost is offset by the cost of redundant WAN circuits. The access points will continue to function when connectivity to the Cisco 8540 Wireless Controller is unreachable, but it will not allow any new connections in that wireless environment.

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• Positive impacts, yeah, is good to have a central location to control all these profiles for different countries and locations. And the drawback, like I said to you really because of the too many integrations that have a dependency on the software version. For example, Cisco ONE for Access have certain software that can run through and then this scatter center need to make sure it's working with the others APS version that is currently working. And we also, the Cisco Catalyst Center also have some kind another version of software that you need to support this controller. So it's like two tier three tiers of the software version that we need to match. Then only it can work.

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