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...

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 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"...

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...

CCNP Switch – Lab 6 – Packet Tracer

This is a pretty straight forward lab that I was asked about. It goes over using both ISL and Dot1q trucks in a network while sharing Vlans with VTP. I chose to knock this...

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...

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...

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