David’s Cisco Networking Blog:

October, 2008


October 31, 2008  3:15 PM

CCIE Security lab exam to be refreshed in April, ’09

David Davis David Davis Profile: David Davis

Are you interested in obtaining a CCIE Security certification? I have taken the lab and I can tell you it was very tough. Well, its about to get even harder. Cisco made this announcement concerning big changes to the Cisco CCIE Security lab exam...

Effective April 2009, important...

October 31, 2008  2:46 PM

Prevent router changes from multiple users with Cisco IOS configuration lock

David Davis David Davis Profile: David Davis

In my latest article, I covered a new Cisco IOS feature used to prevent multipe admins from making changes on a Cisco router IOS, at the same time. This could prevent downtime and outages due to partially implemented or conflicting configurations. Read

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October 31, 2008  2:31 PM

PacketTrap Perspective network management – now support VMware Virtualization

David Davis David Davis Profile: David Davis

I attended a webinar put on by PacketTrap network management this week. I was interested to see one of their latest features of their network management system - Perspective. The new feature is VMware Virtualization support.It works like this - PacketTrap uses SNMP to talk to each VMware ESX host...


October 27, 2008  8:40 PM

David releases updated VMware ESX Server 3.5 video training course!

David Davis David Davis Profile: David Davis

I recently completed my updated VMware ESX Server 3.5 video training course. For over a year now, my ESX 3.0 training course has been a "best seller", helping thousands of IT Pro's learn VMware ESX & VMware's Virtual Infrastructure Suite. In the new course, I have updated videos on how to use...


October 26, 2008  2:52 PM

Windows 2008 Active Directory – New Video Training Course 70-640

David Davis David Davis Profile: David Davis

I have authored many Train Signal courses and used their courses to learn about new technologies. Now, Train Signal, Inc - the global leader in video training - is now offering a new video training course. This course covers Windows 2008 Active Directory and helps prepare you for Microsoft MCITP...


October 24, 2008  8:09 AM

Configure Cisco routers to save core dumps for troubleshooting crashes

David Davis David Davis Profile: David Davis

I recently wrote an article for on how to configure your router to send a core dump of all current RAM memory to a TFTP server when/if the router crashes. I believe this is very important to configure on every router so that you can troubleshoot a router crashing issue with the Cisco TAC, when it...


October 20, 2008  3:15 PM

Cisco’s new Routing & Switching 360 Learning Program

David Davis David Davis Profile: David Davis

Cisco announced a new learning program that will be offered from select learning partners. This could be like the master's program of Cisco routing and switching with the CCIE lab being the capstone. The new

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October 15, 2008  8:12 PM

Use extended ping and extended traceroute to better troubleshoot your Cisco network

David Davis David Davis Profile: David Davis

In one of my recent articles, I covered how to use the Cisco IOS extended ping and traceroute commands to troubleshoot your network. Knowledge of how these commands work is critical to solving many networking issues. The extended options give you so much power! Read the full article at:

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October 11, 2008  8:15 PM

How can PacketTrap Perspective help you manage your Cisco network?

David Davis David Davis Profile: David Davis

New, from the company that brought you the free PacketTrap pt360 network troubleshooting tool, PacketTrap is now offering their full network management system (NMS). This NMS is unique because it works with pt360 to help you to more efficiently troubleshoot your network. Perspective also has a...


October 5, 2008  8:06 PM

How to set OSPF Limit Retransmissions using OSPF to help the system admin

David Davis David Davis Profile: David Davis

The limit for demand and non-demand circuits is set to 24 by default. Sometimes that’s not enough time to ensure that all our data packets are arriving successfully. That’s when this command comes in handy. Here is the command for limit retransmissions: limit retransmissions {[dc...


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