February 22, 2019

Configure vPC Connection

Within the datacenter environment, there is a useful technology concerning device uplinks. The goal is around redundancy. Normally, with a port-channel connection, you would be protected if a single cable or interface would stop...

Cisco 4500 High CPU – Cat4k Mgmt LoPri

This issue was first noticed during a normal check of the switch while another task was being performed. Ping times to the switch's management interface were higher than expected and "sh proc cpu sort"...

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...

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,...

Interconnecting Nexus VDCs

There is a great technology within the Nexus switch product line which revolves around something called a VDC. Basically to keep the description short, a VDC is a logical switch within a physical switch....

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...
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