Change control isn’t so bad. With the underlying goal of risk mitigation, good change control can save a network engineer from the dreaded resume generating event we sweat over during cutovers. Change management frameworks such as ITIL layer an element of bureaucracy over network operations to provide a basis for a quantitative approach to IT […]
A few years ago I was approached by a state organization to be a second set of eyes for a large purchase of Cisco routers and access points to connect all its branch offices to a new central hub. Most hardware line items were Cisco 2921s and 2951s and Aironet 1041s. I asked how many […]
Talking about current events with my dad recently, he gave me a sage piece of advice. He said, “Son, leave your gas can at home.” Now obviously we weren’t talking about IT, but it got me to thinking. There’s seems to be a lot of this same type of reasoning in our industry. Think about […]
In this post we’ll have a look at the process of configuring a FlexVPN network (unofficially known as DMVPN phase 4). I’ll show what components are involved in configuration and how they all tie together. For most patient readers there’s a bonus at the end of this post.
This network design uses global/regional MPLS backbone as primary WAN connectivity method, with Cisco DMVPN backup. DMVPN spokes should have a regional primary hub with secondary hubs also based on location.