David’s Cisco Networking Blog:

February, 2009


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...


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