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…
Provisioning Switch Ports on Cisco DNA Center
Having been fortunate enough to get some hands on experience with Cisco’s vision of the future of the Campus Network, DNA Center, I found myself relearning how to do basic…
Understanding Switch Stack Uptime
When you have multiple Switches as part of a Stack, it can be slightly confusing when checking the uptime to determine what is what. Let’s take a look at how…
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