Using CDP to create the network topology diagram
Hi all
I'm a beginning network specialist and just thought I would throw this question and see if I can get some answers. Well, I want to know how I can use CDP to find out our network topology so I can create diagrams and Visio diagrams, or if you know any free network discovery programs out there that can help? Hey well any comments will be appreciated so thanks in advance and I look forward to hear something!
When you run 'sh cdp neighbors' it shows you all the devices connected directly. If you then "sh cdp neighbor detail" for each entry it will show the IP address of the connected device. You can then connect to this and do the same thing all the way throiugh your network.
I think that the COP may be useful for this, but you're relying on the CDP running on all devices. Sometimes it has been disabled for security reasons one must always be aware that there may be devices that do not display.
As mentioned SNMP is another alternative, but still once, this assumes that SNMP has been put in place the device esch.
So just be aware that you can not always get the full picture, but a combination of--
(1) CDP
(2) SNMP
(3) running the determination of route router hops show but not L2 switch.
You should get most of the information. Also, be aware that the internal firewall tend to dirty such things as well.
Jon
Tags: Cisco Support
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