[How To] Upgrade a Cisco SD-WAN Network

I have a local Cisco SD-WAN lab environment running at home, which was built in EVE-NG. It's what I use whenever I need to test something for a customer, or just play around with the templates or APIs. I'm planning on spending some hands-on time with new features soon, along…

Odd Behavior of Protected Switchports

I ran into an interesting issue recently, which was caused by use of the¬†switchport protected¬†command…. So I use a pair of Cisco 2960-8TC-L switches at home, for both my home network and lab. A few months back I ran a bunch of ethernet cabling within my house,…

Migrating IP Addressing Schemes

Back a few months ago, I wrote a bit about why it is important to have a good design for IP addressing schemes (part 1 and part 2). As a brief refresher, the situation I found myself in was an environment where practically everything was assigned a 10.x.x.…

Port Security: Worth the effort?

Port Security. Always seems like one of those things covered in Cisco exams, yet how many businesses actually use it? For those that aren’t implementing it, should they? Or is it too much of a headache? So the concept of port security is fairly simple – We want…

Virtual Networking Contexts

I really want to take a moment to talk about how wonderful VRFs/firewall contexts really are. Both technologies essentially allow a network administrator to spin up a virtualized, isolated instance of a network device. I’ll be honest and say that I hadn’t had the chance…