Checking for CLI Outputs using Netmiko
Recently I found myself in a situation where I had to find every Switch in a deployment that was hitting a specific bug. This bug ultimately meant that certain commands…
Line Breaks in Python
When learning basic Python, I had to restructure the way I looked at things. An early problem I encountered was the simple task of printing output to new lines, one…
Network Bandwidth Testing using iPerf
From time to time you will find yourself needing to check the actual bandwidth capacity from one endpoint to another. Whether it is to determine any bottlenecks, to carry out…
What is an SVI?
Otherwise known as an ‘Interface VLAN’, an SVI (Switched Virtual Interface) is one of the things that really confused me when I first started studying for my CCNA. VLANs as…
Packet Capture on Cisco 9300 Switches
Cisco’s 9300 line of Switches are a welcome upgrade to the line-up. Recently I discovered that they have the ability to capture packets on the Switch themselves (specifying a port)…
Confirming Your Current User Account
When working on Linux, you might not always be able to see which user you are logged in as by default, or perhaps you want confirmation before making a change.…
Understanding Show IP Route
On Cisco Layer 3 devices, the Show IP Route command tells us about all the L3 routes the device knows about (though you will have to specify the VRF if…
Testing an Ethernet Cable from a Cisco Switch
An essential factor in troubleshooting LAN connectivity is by first ensuring that the physical connections are functional. When it comes to a Layer 2 network, this means the Switches, the…
Configuration Register and ROMMON
On a Cisco Device, the Configuration Register (often referred to and listed in the configuration as ‘confreg’) is a value which tells the device which software to load and run.…
Bundle Mode vs Install Mode
When installing or upgrading the IOS on a Cisco Switch, there are 2 modes we should be aware of. Bundle Mode and Install Mode. As you’ve likely guessed, these are…
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