David’s Cisco Networking Blog:

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December 23, 2008  4:27 AM

How to Configure Integrated IS-IS



Posted by: David Davis
Cisco, Networking, Routing

Cisco Integrated IS-IS is part of a link-state Interior Gateway protocol and supports CLNP, IPv4, and IPv6.  To verify your platform support, please see my article covering the Cisco...

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November 30, 2008  8:10 PM

Filter Web content with Cisco IOS routers



Posted by: David Davis
Cisco, Networking, Security

I recieved a ton of comments and positive reviews for my latest Cisco article: Filter Web content with Cisco IOS routers. In this article, I cover how you can use a...


November 30, 2008  2:18 PM

What is Route Table Profiling and How can it help you?



Posted by: David Davis
Cisco, Networking, Routing

Originally introduced as a hidden command in IOS 11, Route Table Profiling is now an officially supported command and can be very helpful to Cisco network Admins. With Route Table Profiling, you can monitor for fluxuations in the routing table, route flapping, and network outages, among other...


November 30, 2008  8:58 AM

FirePlotter shows real-time Internet traffic on Cisco PIX, ASA, and Fortinet



Posted by: David Davis
ASA, Networking, PIX, Security

I ran across this cool firewall tool called Fireplotter. It graphs and shows real-time Internet traffic going through your Cisco PIX, ASA, or Fortinet Firewall. You can use it to:

  • Find out why your internet connection seems to have slowed down
  • Identify unfamiliar...


November 14, 2008  4:21 PM

Cisco Service Provider Router Overview – the most powerful routers ever made



Posted by: David Davis
Cisco, Networking, Routing

In a recent article, I covered the Cisco service provider router lineup. These amazing routers are what allow us to surf the web and watch IPTV. In this article I cover routers like the CRS-1 (Cisco's most powerful router) and the new Cisco ASR 9000 and 1000 routers. To see the full article, read ...


October 31, 2008  2:46 PM

Prevent router changes from multiple users with Cisco IOS configuration lock



Posted by: David Davis
Cisco, Network Management, Networking, Security

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


October 20, 2008  3:15 PM

Cisco’s new Routing & Switching 360 Learning Program



Posted by: David Davis
Certifications, Cisco, Networking, Routing

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



Posted by: David Davis
Cisco, Network Management, Networking, Routing

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:


October 5, 2008  8:06 PM

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



Posted by: David Davis
Cisco, Routing

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...


September 30, 2008  11:06 PM

What happened to your data?



Posted by: David Davis
Cisco, Networking, Security

The HR department isn't technical enough to understand that critical & invaluable company data can easily walk out the door (or out the network) any day of the week. There are SO many ways to get data out if you really wanted to. Most companies don't monitor outbound email, they don't control...


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