I’m currently working on a design and needed to verify some failover behavior of the Cisco ASA firewall. The ASA can run in active/active or active/standby mode where most deployments I see run in active/standby mode. When in a failover
CCDE – WAN Speeds and Basic Voice Calculation
I’m preparing for the CCDE practical and I was doing a practice scenario by Jeremy Filliben and I realized that I’m not comfortable with all of the WAN speeds so I might as well write a blog post on it.
CCIE – How to Prepare for the CCIE Lab
Summary: By preparing a plan and strategy for the CCIE lab, the chance of passing will be a lot higher. Over the years I have written about the CCIE multiple times and also mentored people on how to prepare for the
CCDE – MPLS-TE Auto Tunnels
This post will briefly discuss the challenges of manually setting up MPLS-TE tunnels and how Auto Tunnels can lessen the burden of MPLS-TE tunnels. One of the main challenges with traffic engineering and MPLS-TE is the number of tunnels that
CCDE – Review Of CCDE Practical Workbook By Orhan Ergun
To kick off the new year, I will give you a review of the CCDE Practical Workbook by Orhan Ergun, CCIE #26567 and CCDE #2014:17. Orhan is a friend and has provided the workbook to me for reviewing. I would
CCDE – CCDE Qualification Exam Passed
A couple of days ago I passed the Cisco Certified Design Expert (CCDE) Qualification Exam which means that I am now eligible to take the CCDE practical. I’m aiming to give that a try in May. This post will give
Network Simulation – Cisco Releases VIRL 1.0
Just in time for thanksgiving, Cisco has released version 1.0 of the popular network simulation tool VIRL. This is a major new release moving from Openstack Icehouse to Openstack Kilo. This means that your previous release of VIRL will NOT
General – Behavior Of QoS Queues On Cisco IOS
I have been running some QoS tests lately and wanted to share some of my results. Some of this behavior is described in various documentation guides but it’s not really clearly described in one place. I’ll describe what I have
CCDE – Firewall And IPS Design Considerations
Introduction This post will discuss different design options for deploying firewalls and Intrusion Prevention Systems (IPS) and how firewalls can be used in the data center. Firewall Designs Firewalls have traditionally been used to protect inside resources from being accessed
Network Simulation – Cisco VIRL Increases Node Count
Great news everyone. Some of you might have seen that I created a petition to increase the node limit in VIRL. I know there have been discussions within Cisco about the node limit and surely our petition wasn’t the single