David’s Cisco Networking Blog:


February 13, 2009  10:55 PM

What is CDP and how can it help you?

Posted by: David Davis
CDP, Cisco, cisco discovery protocol, ios, troubleshooting

he Cisco Discovery Protocol (CDP) is a proprietary layer 2 management protocol for networks. CDP provides network device inventory, connectivity information, and IP next hop info. It works on LANs and WANs. CDP also works no matter the layer 3 network in use. This, no matter if you are running...

February 10, 2009  11:03 PM

Ensure Cisco router redundancy with HSRP

Posted by: David Davis
Cisco, failover, hsrp, ios, redundancy

Cisco routers are very reliable but no router is perfect. Routers can go down at anytime due to bad hardware, failed IOS upgrades, or just plain human errror. Your default gateway router is your connection to the outside world (that's the Internet). I recommend you configure the hot standby...

February 9, 2009  11:04 PM

Synchronize a Cisco router’s clock with Network Time Protocol (NTP)

Posted by: David Davis
Cisco, ios, ntp, Security, time

Is the time and date on your cisco router I switch correct? Both time and date need to be accurate for things like security logs, troubleshooting logs, time based ACLs, and a variety of other reasons. Fortunately, the network time protocol, or NTP, was created to sync the time and date on our...

January 27, 2009  7:58 PM

The 10 Cisco IOS Router file management commands you must know

Posted by: David Davis
Cisco, commands, file, ios, management, Routers

In my latest article, I cover the top 10 Cisco IOS router file management commands that every Network Admin should know. These, of course, start with dir, and cd, fsck, verify, and many more - all commands that you might not have known you could do...

January 26, 2009  11:47 PM

Top 10 YouTube Hacking Vidoes

Posted by: David Davis
hacking, Security, Videos, Virtualization

I really enjoyed Jamey Heary's NetworkWorld.com article covering the Top 10 YouTube Hacking Videos. While there were may interesting and funny videos, the one that I found most interesting (as I am interested in...

January 26, 2009  6:54 PM

Cisco PIX to ASA MigrationTool

Posted by: David Davis
ASA, Cisco, conversion, migration, PIX, tool

July 28, 2009 will be the end of sale / end of life for the Cisco PIX. As you already know the Cisco ASA is the replacement. Luckily for us, Cisco offers a...

January 15, 2009  11:57 PM

New Cisco CCNA Security Video Training from Train Signal

Posted by: David Davis
640-553, CCNA, Cisco, Security, training, video

Chris Bryant, CCIE #12933, and Train Signal have released their latest video training course and it covers the Cisco CCNA Security certification. The course not only prepares you to pass...

December 25, 2008  5:16 AM

David’s Border Gateway Protocol (BGP) Resource List

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

For those of you interested in the routing protocol of the Internet - Border Gateway Protocol, or BGP - I have written a number of articles on the topic. I recommend you checkout the following:

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December 25, 2008  4:47 AM

How to Enable Policy-Based Routing in the Cisco IOS

Posted by: David Davis
Cisco, Networking, Routing

Policy based routing (or PBR) is a process that has the router put packets through a route map before routing them.  This may be a good way of sending packets to a particular path for protocol security routes, for instance, instead of using the default shortest path algorithm.  To use PBR,...

December 24, 2008  4:29 AM

Managing Cisco IOS IP Routing Authentication Keys

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

Key management is a way of controlling authentication keys used by routing protocols. You can think of these as "passwords" for your routers. Not all routing protocols can use key management. Only DRP Agent, Enhanced Interior Gateway Routing Protocol (EIGRP), and Routing Information Protocol...

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