Define Threat Asymmetry
When working on NX-OS it’s kind of annoying to attempt to use a feature that hasn’t been enabled and get an error message. Why not get an “not enabled” or “not licensed” error message ?
It’s a common discussion about when Cisco VTP protocol is actually forwarded through Cisco switches and when it’s isn’t. I’ve always gotten it somewhat confused and when I stumbled across some old notes on the topic I had an ah-hah moment. I’m answering the equation about when using VTP in your network, which versions are risky – that’s risky is terms of how do you prevent VTP updates from ‘crossing’ a switch.
Short Answer is “It depends, but usually yes.” Long answer follows with a discussion of launch power, receiver sensitivity, and cable losses.
I got asked a question by a reader “is OpenFlow used for Routing or Switching ?”
A short summary of the Fibre Cable Connectors, description and some notes on usage. This is summary notes and intended for reference.
Cisco IOS and Native VLANs – some brief notes to myself.
Why does a Cisco IOS SX switch not let you use VLANs 1002 − 1005 ?
Mostly for my own reference. I really need to practice using the Delete Buffer commands and Ctrl-R Refesh as part of my muscle memory.