David’s Cisco Networking Blog:



May 30, 2009  8:31 AM

Cisco IOS How-To Tips and Tricks

Posted by: David Davis
Cisco, ios, tips, tricks

I have published over 20 different Cisco IOS tip and trick articles over at the Petri IT Knowledgebase. In these Cisco tips, I cover things like setting up a Cisco switch, VLAN configuration, DDNS, ACLs, and selecting the right router for your CCNA...

March 28, 2009  1:13 PM

Video: How to perform DHCP Snooping from Train Signal

Posted by: David Davis
CCNA, Cisco, dhcp, ios, snooping

In this sample of the Train Signal Cisco CCNA training course, Chris Bryant offers a demonstration on how to perform DHCP snooping in the Cisco IOS.

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February 25, 2009  11:06 PM

Cisco administration 101: Five interface commands you should know

Posted by: David Davis
Cisco, configuration, interface, ios

Configuring Cisco routers isn't hard if you don't know how to use interface commands. Let's face it, you have to know commands like no shutdown, ip address, description, bandwidth, and access-group. In my new article, I discuss all of these commands in detail...

February 23, 2009  1:53 AM

Take advantage of the Cisco License Manager to keep you organized

Posted by: David Davis
Cisco, compliance, ios, license, manager

Software license compliance is critical in IT Departments today. After all, you don't want your company to get into legal trouble over mismanagement of licenses, do you? To help you out, Cisco has something to make your life easier. Did you know that Cisco offers a free device inventory, license...

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...


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