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Chris Marshall

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Hello, my loyal blog post readers, in this my third installment of our SD-WAN series I am going to walk you through how our vEdge router locates, communicates and authenticates itself onto our SD-WAN fabric. Along the way we will take a look at a few packets captures and command line output to see what is going on under the hood.

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In my last post in the series I introduced you to the four architectural components that control and enable our SD-WAN fabric. In that post I had promised that in our next installment we would take a closer look at our fabric bring up sequence, but if you will indulge me I would like to hold off on that topic for the next post. In its place I would like to use this post to introduce you to the...

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Over the past year I have been fortunate enough to work on several Cisco SD-WAN (formally Viptela) deployments. These projects have ranged from small three or four site implementations here in the bay area, right through to large scale international rollouts incorporating hundreds of sites spread-out across the globe with regional POPs providing branch services and backbone connectivity.

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Last year, the hot topic taking over the IT space was Software Defined Wide Area Network, or SD-WAN. It simplifies WAN management, connects enterprise networks, and provides aggregation of WAN bandwidth, centralized control and policy enforcement, and visibility into network traffic.

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Happy New Year loyal LP blog readers, and what a start to the year we have had. Unless you have had your head in the sand for the last week you cannot help but have heard all the buzz around the latest two high profile security vulnerabilities to hit our networks. I am of course referring to the infamous Spectre and Meltdown flaws. Cue dramatic music “Dun Dun Duuuun!!!!”

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I have recently been working with a customer on designing and building out a new Data Center. This task is something that is not as common as it once was, with many of our customers adopting a cloud first methodology (AWS, Azure etc.) when it comes time for a DC refresh. Since it’s a been a while since I have dived into DC technology I figured it was about time that I take another look at Cisco...

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I was recently called in to assist a customer with identifying the cause of slow performance for an application within their environment. I don’t know about you but I love a good networking who done it, so I could not resist accepting the case. The following blog post documents my experience and findings while working this investigation that will from here on out be known as the “The Case of the...

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It’s approaching 10pm on Friday night and you are getting ready to apply your IWAN / Routing Protocol / <Insert major project of your choosing> migration script to the very last of your branch site routers. You have been saving this branch till last for a very special reason. This is after all that branch site that is in the furthest darkest corner of the globe. Your company of course has no...

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So, you have invested in the latest generation of security appliances with their application aware policy capabilities, integrated IDS/IPS and URL filtering. All your endpoint devices have been deployed with the newest Advanced Malware Protection agents using the latest machine learning technology. You subscribe to the CVE feed and have a well-defined procedure to patch your entire environment at...

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On February 2, 2017 Cisco announced a major issue affecting products from their routing, switching, security and server product lines. Reference Tables A through D below for a full list of affected products and part numbers.

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