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How to get a Cisco 7940 working on a small network

Hi Folks,

I have to get a Cisco CDP solution together for a customer to do IP phone discovery, so I've bought a Cisco 7940 phone, plus a power supply, and now I have to get the thing on the network.

I plugged it in, it says "Configuring VLAN" then it says "Configuring IP" - and there it stays.

I don't even need to use it for phone calls, I just need to get a cdp tool working with it.

My network is the classic Microsoft AD / Microsoft DNS / Microsoft DHCP, all behind a cisco asa 5505. All our IP's are 10.5.0.0/24

So, is there a way to get it onto the network and pingable, cdp queryable, even working ??

thanks
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plq
Asked:
plq
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4 Solutions
 
greg wardSystems EngineerCommented:
To get the phone to receive a dhcp address you need to use the 150 option.eg cisco router would be
ip dhcp pool 192.168.1.0/24
 default-router 192.168.1.1
dns-server 4.2.2.1
 option 150 ip 192.168.1.1

you can set the phone manually but its more "fun"


http://www.cisco.com/en/US/products/ps10033/products_qanda_item09186a0080a35e79.shtml
you still need a tftp server with the phone load files before the phone is running.

This is normally done by cme or cucm

Greg
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plqAuthor Commented:
Thanks for this. I'm way out of my depth. I'll follow that doc first and will come back to EE for next steps.

thanks
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mark_06Commented:
Your question is a little confusing. If you could clarify it a bit that would help!

Do you realize that CDP is a Layer 2 protocol? You don't need to configure a device with IP's etc to discover it, you just need to plug it in!

CDP is also Cisco proprietary, meaning that it won't work with a Microsoft AD network, only with other Cisco devices.

Have a look at this http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd301c.html

Where you would normally use CDP with IP phones is so the Cisco Switch can determine it's an IP Phone or for Cisco Unified Video Advantage (CUVA) on your PC so that it could discover the IP Phone.

CDP also can only see directly connected devices, it's not a routed protocol.

The steps deepdraw has given you are correct to get it on the network, but have nothing to do with CDP!
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plqAuthor Commented:
Well although its stuck on configuring vlan it did get an IP address and I'm actually getting the info I need from http via /DeviceInformationX etc.

So I'm getting what I need without using CDP.

I'm not a cisco/networking expert hence the confusion.

Will respond back...
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greg wardSystems EngineerCommented:
Sorry i did not realise it could do cdp without loading the firmware.
I just reset my phone and while it was configuring vlan i was able to see cdp info of the device.

Greg
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plqAuthor Commented:
OK Its all working. I'd just like to ask one more question.

Would you say its normal for IP phones in a corporate or gov organisation to be patched onto separate subnets from the PC network ? Or would they normally just be plugged into the main network and dhcp'd in the same ip range as the pcs ??
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greg wardSystems EngineerCommented:
Phones are normally on their own vlan, this is to stop broadcasts over the whole network.
Also is helps make the conversions more secure ie cant listen , cant spoof a call.

Greg
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greg wardSystems EngineerCommented:
And a third point, they normally get their own powered switch. if someone plugs a pc into a phone port they take up a powered point.

Greg
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plqAuthor Commented:
Excellent. that makes my life a lot easier..

Appreciate your help.. thank you

Points coming up
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mark_06Commented:
Also it's worth noting that each Cisco IP Phone as a switch built in that supports Trunking and QoS. It also means that you don't have to double up on switching for IP Phones and Computers yet you can still run them independently.
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plqAuthor Commented:
Just one more if I may.

It would be really useful if I could pull the phone number or extension number from the http interface. I've googled on this and it doesn't seem possible, but maybe you guys know a trick that would get this info for me ???

thanks
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plqAuthor Commented:
Hey guys, I never got an answer to my final question re the Phone Number or Extension Number ... if you're listening. .. is this possible ?

thanks
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