Allocate Ports to a Cisco Nexus VDC

If you are working with a Cisco Nexus 7000 or 7700 device then VDC's are probably not something you are unfamiliar with. In a very brief summary it allows you to seperate a single...

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...

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...

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...

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....

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 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"...