Hey, trying to start blogging more again. I’ve been busy the last couple months. I went to Cisco Live earlier this summer, moved into a new apartment, and am working towards my CCNP right now. At Cisco Live, I found Continue reading Cisco ONE SDN Nuts and Bolts
We’ve recently done a few migrations of apps between different F5 LTM load balancers. Thought I’d post some brief steps on on how we’ve done this in a couple different scenarios. In our environment, the load balancers are deployed on Continue reading Migrating between F5 LTM’s
I worked with MTP cables for the first time recently as part of a 40G Ethernet deployment. This was definitely a learning experience for me. There are a few aspects of MTP cabling that require some thought before you deploy Continue reading MTP Fiber Cabling
At the enterprise I spend most of my time on-site at, we’ve been having problems with host facing port-channels whose members are on a fabric extender. Our situation is this – we have fabric extenders (FEX’s) that are connected to Continue reading Port-Channel Load Balancing off of FEX’s on Nexus 7000
The previous posts I’ve made around access layer security features have been somewhat more focused on protecting the network itself from attack. One of the biggest security issues with Ethernet / IP is that there are no built-in protections against Continue reading Access Layer Security Features Part 3: Spoofing Protections
Over the past six months, we’ve been working on moving a pretty significant number of applications (hundreds of apps, over a thousand individual virtual servers) from Cisco CSM + SSL SM load balancers over to F5 Viprions for a large Continue reading F5 LTM Profile Tweaks
I’ve recently re-vamped my OpenVPN remote access setup at home. I have always had two separate VPN instances: a “trusted” instance that was not firewalled, and a “normal user” instance that has limited access – just to email, internal websites, Continue reading OpenVPN Remote Access with iproute2 VRF’s
At the enterprise that I work as a consultant at, we have a need for keeping track of where hosts are connected in the data centers. We’ve used some manual tools that queried switches via SNMP in the past to Continue reading Switchport Mapping Script
Spanning tree is the only commonly deployed Ethernet control plane protocol today. Eventually, something like TRILL or maybe Shortest Path Bridging will probably eliminate the need for Spanning Tree, but we’re definitely not there yet. Since access ports are designed Continue reading Access Layer Security Features Part 2: Spanning Tree
In a new deployment that I’m working on, I recently came across Cisco’s Nexus 3016 for the first time. It’s also the first time I’ve worked with 40G, so that’s exciting too 🙂 The Nexus 3016 comes with 16x 40 Continue reading Nexus 3016 Interface Numbering