Those Pesky ACLs
Do you remember the first access control list you ever added to a Cisco router? Was probably something simple like blocking IP subnets…
Connection Refused
An interesting thing happened on my network over the last few days. It was easily remedied, but if you’ve never seen the issue…
Demystifying OSPF on a vPC
A common issue among network engineers managing the Cisco Nexus platform is how to form routing adjacencies on hosts over a Virtual Port…
Designing a Network (Part 2)
If you’ve considered the problem I wrote about back in December, no doubt there have been some questions about requirements. Actually, if you’re…
Plan BEFORE You Execute
Before you implement a network or systems change, it’s very important to have a plan. A plan that not only includes your scripted changes but also a back-out and recovery plan.
Designing A Network (Part 1)
Over the next few weeks, I’m going to do a series on network design in the enterprise. It’s funny how a network becomes…