Sunday, September 10, 2017

High CPU on Nexus 3K - Solved

In this blogtorial, I will demonstrate how I used 'ethanalyzer' on a Cisco Nexus 3K to solve an intermittent issue -- random adjacency drops of various routing protocols. Before we get into the details. let me first share with you on how I got involved in this troubleshooting to begin with. My good friend and colleague "BGP" bill aka self proclaimed "Multicast Guru" 😊 turns around says "Hey Weezy, you are a CCIE right? I have an open case with Cisco for a month why don't you just solve this issue?". Hmmmm ... above all else, one thing I've learned from the journey of becoming a CCIE is that I know very little. There is so much more to learn than you can imagine. In any case, I thought it was a noble challenge and as a bonus it peaked my curiosity. So Bill and I started chatting about the issue and as we were going through the motions, he gave me a great piece of information that would eventually steer me down the path to solving the issue, "Pete reported that he saw HIGH CPU usage compared to other similar routers".

So my 2 questions were: