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…
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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…
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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…
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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…
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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.
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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…
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