How to: Catalyst 9800 MAC Filtering

Update 2020 / 05 / 19 – I’ve added a video above that walks through the steps detailed in this blog post. If you’re using the ‘Basic’ Wireless setup, you may see an error when trying to apply the policy: “switch 1 dbm wireless Use…

CCIE R&S Study Resources

Over the past year and a half (and still ongoing), I’ve burned through a handful of books and other resources while working toward the CCIE. I know quite a few people have already dumped out their recommended reading lists – but I figure it’s still worth…

Getting Started with Cisco NFVIS

A few weeks ago I got my hands on a Cisco UCS C220 M4 server – which I’ve set up in a lab to install and test Cisco’s Network Function Virtualization Infrastructure Software (NFVIS). I really wanted to get this running on an Enterprise Network Compute…

CCIE Progress Update

Just over a year ago I posted that I was starting work toward the CCIE R&S exam. My original goal was to take the written exam by June of this year – so what progress have I made, and where am I at now? Well I ended up…

Where is all the Automation?

The future is APIs! SD-EVERYTHING! Automation! Orchestration! Artificial Intelligence and Machine Learning! Sound familiar? It’s all part of the messaging going around in just about everything IT-related. With as much as you keep hearing about it, you might think that it’s all anyone is doing anymore.…

Synology Volume Crash

Back when I bought my Synology NAS in 2012, I picked up 4 Seagate 3TB drives. Yes, they’re the same model (ST3000DM001) that BackBlaze reported about in 2015 since these drives have an unusually high failure rate. I even managed to have one drive fail within the first…

Tips for Working with Vendor Support

This post has been on my mind for a while now. I’ve worked as a network admin for long enough, and opened more technical support cases with vendors than I want to think about. Over the years I’ve developed my own process for how I handle…