October 16, 2018

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...

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,...

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...

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...

Multiple Spanning Tree – MST

The next section of the CCIE R&S v5 Blueprint that I was running through was "1.1.f (i) PVST+/RPVST+/MST", specifically MST or Multiple Spanning Tree. Pretty straight forward process around this one and here is the summary...

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"...
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