Guide to DHCP Snooping

DHCP snooping is a security feature that you will surely run into in while studying for your Cisco exams or while working in an enterprise environment perhaps. It first off helps ensure that you...

Cisco 3850 – High CPU Usage (fed and iosd processes)

Recently, out of nowhere, I had a 3850 stack that spiked in terms of CPU usage. This particular stack had no recent changes in configuration and had been  up and running for around 20...

Cisco 3850 Wireless Controller – FAQ

There was a recent project I was working on where I was going to be using a Cisco 3850 switch as a wireless controller, which is a fully supported feature that is build into...

Latency Issues – IP Redirects

Sometimes, you may run into a situation where traffic enters a routed interface and then per the routing table, exits the same interface. For instance, take a look at the topology below: In that topology...

Cisco 4500 – Switching Port Media Types

This is an interesting one I never came across so I figured I'd share it out for everyone else too. I recently purchased a Cisco 4506 switch with a few blades already installed. One...

LACP Port-Channel Member Ports Suspended – %EC-5-L3DONTBNDL2

Recently ran into this issue where a switch rebooted and when it finished reloading, one of the member ports would not come online. The port was stuck in a suspended state. When this occurred,...

Cisco Stack – Changing the Switch Stack Member Number

Sometimes you may find yourself needing to change a Cisco switch stack member number in a stack setup. This is not the most common of things that you will do on a daily basis...

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