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I was at VoiceCon two weeks ago, participating in a panel where I talked about network resiliency and presented my VoIP Troubleshooting and Monitoring tutorial.  Both presentations included examples of [...]

Note: This is an older version of my command summary, the updated version is available at http://www.cisco.com/en/US/docs/switches/datacenter/sw/4_1/nx-os/master/index/master_index.html http://docwiki.cisco.com/wiki/Cisco_Nexus_7000_NX-OS/IOS_Comparison_Tech_Notes <– just found this, includes multiple articles comparing Cisco NX-OS and Cisco [...]

I’ve been doing a configuration change on over 500 devices of a customer’s network, and using NetMRI to install the change was extremely easy.  Below is the script that I [...]

ASA 8.3 was recently released.  One welcome improvement was a new method of managing failover licenses.  Previously, ASAs in a failover pair each needed to have a license for a feature.  For example, let's say that an ASA failover pair required a 100 session SSL license.  In version 8.2 and…

This week I was part of a panel at the Satellite 2010 conference in Washington, DC.  Our panel was titled “Securing Your Network: Protecting your Operations, Content and Assets.”  Your [...]

The number of issues that could arise in your VoIP deployment involving voice gateways are too numerous to capture in one blog.  The issues and variants are probably too numerous to capture in one blog series.  So, my intention with this series is to simply touch on methods I use…

In the recent past I was helping one of our customers with some special SRST configuration requirements.  The customer had several key DIDs that were associated to a site that were not assigned to IP Phones on the site.  For example, a hunt pilot that would ring a group of…

Because NetCraftsmen was offering a free 30 dial trial of Netcordia’s NetMRI software, we have had some recent discussions on the best way to run a trial. Here is my summary [...]

As a departure away from my standard "how to" blog style, I wanted to touch on a topic that I think many of IT professionals take for granted.  I am talking about the need for operational discipline, particularly in large enterprises where being unprepared could impact a large amount of…

This is part 3 of a series about Layer 2 over Layer 3, although I changed the titling somewhat. This blog takes a look at a very practical application of some [...]

After the experience with a wedged router interface (see prior post: Applied Infrastructure blog under

This article continues and builds upon my prior blog http://blogs.cisco.com/datacenter/comments/data_center_interconnect/ Cisco page on DCI (with more good links): http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_493718.html DCI Design and Implementation guide: http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_Clusters.html (contains a geoclusters chapter)