The IT challenge: Fault Finding with DNA center
Cisco DNA Center has been released to the market and promises advanced features in the realm of Assurance and Automation. Assurance allows DNA Center to provide useful insights into the networks behaviour – this blog is focused on how insights can help in proactively identifying issues before the The IT Challenge: Fault Finding with DNA Center Cisco DNA Center has been released to the market and promises advanced features in the realm of Assurance and Automation. Cisco has embarked on the path of Software Defined Networking, and DNA Center is the management system. In this blog we're going to explore some of the features that come with DNA Center that help automate and speed up the process of fault finding. Assurance allows DNA Center to provide useful insights into the networks behaviour – this blog is focused on how insights can help in proactively identifying issues before they become a major issue. Firstly, what are Insights? Most monitoring systems provide up / down type alarms, but you then need to spend time interpreting and then fault finding these. What if the management system could provide alarms as an insight into the issue and the effect its having on your network health - along with guided fault finding to make resolution of the issue easier. That's just the intent behind DNA Assurance.
Cisco DNA: Assurance Mode
In Assurance mode, DNA Center provides advanced analytics and fault finding assistance. If you focus on the typical fault finding scenario, significant time is spent on up front data gathering, before the actual fault finding can take place. This is an amount of time that’s wasted before you can actually get to the point of starting to pin-point the issue at hand. For a major outage, this is a big problem. If you consider when something big hits in your network, you can be deluged and overwhelmed with alarms and alerts. One option is to setup hierarchical alarms, which many systems can do, but there's a better way. Cisco DNA Center introduces the concept of a network health monitor - you're not looking at an up / down alert, but the actual impact this will have on the network. The challenge in IT is the amount of time wasted on fault finding. Here’s the key issues:
Time Spent: The time spent collecting diagnostic information is huge – typically 4 times that spent analysing it
Fault Replication: You have to be able to replicate the fault, and capture it as it happens – no easy task and normally means being onsite
Time to resolve: WiFi issues are often complex to replicate, fault find and diagnose. This means they are user impacting and expensive.
Cisco 1800S Series Sensors
The Cisco 1800S series sensor is a useful addition to the fault finding armoury – you can leave this device in a room and it will periodically connect to the network, act as a client and disconnect. This allows the network to be actively tested and a quick determination made where issues might lie. If you're interested in more information on the sensors, check out our blogs on these:
DNA Center: Intelligent Capture
With the stream of live telemetry data, DNA Center is able to categorise and fault find for you, actively showing where issues are likely to lie. While Cisco Prime was able to display data, it was typically collected every few minutes, so cannot be considered as telemetry and not always granular enough to help in resolving issues. DNA is able to provide telemetry every few seconds, vastly increasing the granularity of data collected. This removes those averaging errors, when you end up missing an event because the system is only checking every few minutes. With more granular data, you've got a much better chance of spotting the issue and trend.
DNA Center: Client 360
DNA Center keeps lots of logged data – and in granular fashion too. Cisco have named the ability to review this data as ‘Network Time Travel’, where you can revert to earlier log files and run through an issue as if you were fault finding at the time. This is immensely useful when dealing with an issue that a user has reported as happening a week ago. The data allows you to review the client and application experience and make some quick determinations on where issues might lie – with the DHCP server, the AAA server, the client itself and so on.
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