Cisco IOS vs. Cisco NX-OS vs. SONiC Network Operating System

I've worked with several network device vendors in my 10+ years of being in the industry and my favorite continues to be Cisco IOS. Overall, Cisco IOS tends to be the most stable, the most intuitive, has the best TAC support, and has the best knowledge base articles and white papers.

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It's definitely very well suited for data center environments and the scale that is sometimes required. We also manage many enterprise environments, and we almost never see Cisco NX-OS or Nexus in an enterprise environment, only specifically on the data center side. Mainly because of the lower bandwidth requirements and so on. But it depends on the hardware, since it's a software product.

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• User friendly CLI.
• Quick fixes for critical bugs.
• Longer uptime.

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• Cisco NX-OS does a great job of supporting high dense environments due to Cisco NX-OS based devices having some of the fastest packet switching performance
• Cisco NX-OS supports high bandwidth environments really well due to the high throughput links that are typically found in Cisco NX-OS network appliances
• Cisco NX-OS provides some of the best redundancy in the way of "Active-Active redundancy" via it's VPC technology. This is especially desirable in data center environments.

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• By this point, there are several "flavors" of the Cisco IOS such as XE, XR, and the standard Cisco IOS. While they are all fairly similar, there does exist syntax differences between them. It would be ideal if at some point in the future, Cisco is able to unify all of them into one standard operating system which would use the same syntax across all platforms.
• While overall Cisco does a great job of QA'ing their IOS, no matter the release, there's always some minor bugs. I think it's important that Cisco continue to pour resources into their QA team to test their software.
• While I'm very familiar with the graphical readouts of "show processes cpu history" I would love for Cisco to eventually find a more intuitive way to display this data. I can't begin to count how many times I've had to teach more entry level (and even mid level) engineers how this graph is interpreted.
• I do wish that Cisco had something similar to Juniper's "commit check" or "commit confirmed". This helps validate the changes you're about to apply, and catch errors, so that you have a better idea of the impact of the change.

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• I think one thing we'd like to see a bit more in the Nexus space is probably the troubleshooting features. So one would be the I perf feature and being able to test network traffic across links. Don't get me wrong, there's a lot of really good features in terms of troubleshooting, but one particular one that we like to see is where we can test network traffic. We can make sure that we have good latency, we got good bandwidth utilization as well. For us that's a big one. We've got to use third party tools to do that. So if the NXOS platform can do it, that's one of the thing we've got to do.

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IOS is pretty intuitive as you can use the question marks to check for all the options or parameters for a specific command. Also having the tab key to complete the words is nice as you don't need type the complete command. Using also abbreviated commands with 2 or 3 letters instead of the whole Word makes it a great OS.

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NX-OS has many similarities with the traditional IOS which is quite beneficial when it comes to configuration and learning. As a native Linux system, there are a lot of tools and features that can be enabled for any use case.

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Excellent and the best Automation capabilities with Cisco NX-OS which effectively allows easy management of different networks across the whole organization keeping all the business data secure and well managed. With its ability to detect any data threat and effectively fix the issue, Cisco NX-OS has extremely powerful options and its process monitoring capabilities are the best.

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Cisco support never fails me. In terms of timely response, no one is on par with them. They really value the impact of having technical issues and potential business stoppage. Also, their support staff are well equipped with knowledge and skills and easily resolve the most common incidents. Most of the time, we can resolve an issue by just calling them once.

Cisco has a better presence on corporate business so it makes it easier to find engineers and technitians to support your network. Also a lot of Universities and schools use it as a reference and use it to teach and prepare students so it will be easier to recruit people with cisco preparation.

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I am much more familiar with the commands in Cisco IOS as it has been around for many more years. I know why NX-OS is a different system and can see the benefits of the fibre channel integration, but I do not understand why the commands had to use a different syntax. With the Nexus switches you don't get a choice of operating system unfortunately.

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Up to now, we haven't had a major ground-shaking attack on our networks but we take no chances by using NX-OS alongside a SIEM. All endpoints and workloads are secure so I would say we have plenty of trust in their security model.

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• Great uptimes on proven availability/reliability.
• Longevity of these switches ensures great ROI.
• Easy to learn for new users.

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• We do have some implementations on Cisco NX-OS and Nexus hardware, and some of these are already quite old, but they are still running pretty smoothly. So they are super reliable, in my opinion. So that's one of the very positive ways it impacts companies.

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