So I understand the DHCP removal part, I need a little help on the ip helper address, my customers dhcp server sits at 192.168.10.101 (not my network design), would the command be:

interface ethernet 1

ip helper-address 192.168.10.101

No, it would be

interface bvi100

ip helper-address x.x.x.x

That is the voice VLAN.

Let us know how it goes. Also, do not forget to specify option 150 on your DHCP server for the phone DHCP scope. Option 150 should be equal to the Voice VLAN IP, 10.1.1.1

marcos

1) interface bvi100

ip helper-address x.x.x.x

I assume x.x.x.x is equal to 10.1.10.1

2) I think you meant to say set option 150 to 10.1.10.1 ?

no, x.x.x.x is your DHCP server IP. And 10.1.1.1 is correct (if you haven't change dthe default voice subnet)

Thanks Marco....

Adam

Hi Adam,

Our data VLAN DHCP server is our Windows SBS server, whereas our voice VLAN is using the UC500 as our DHCP server.  So far, everything is working great.  The only thing I've had to do is set static TFTP servers on my softphones.  If you would like me to send you any information about our system, let me know.  I'd be happy to send screenshots in CCA or anything else that might be helpful.

Seth

Seth,

Thank you for the reply. The whole process was quite simple in retrospect.

We moved the DHCP to MS server and added option 150 pointing to 10.1.1.1 (voice server) to the scope, Deleted the data vlan dhcp (make sure you keep the voice vlan dhcp). The only gotcha part was making sure the ethernet port role for our server in CCA was desktop (not phone desktop).

Worked like a charm. Thanks for all the help

Adam

I understand that you might not want to disable the Microsoft DHCP server. Whenever we deploy a UC500 or 800 series ISR, we generally use the DHCP server on the UC500 or ISR, even if the customer has servers running Windows Server or using Active Directory. Cisco IOS has the necessary features, and we can add settings to the DHCP server on the UC520 without breaking CCA compatibility.

Here is how DHCP is configured on the UC520:

• IP address range must be in the subnet of the Data VLAN
  
• Default gateway is set to address of Data VLAN interface on UC520
• DNS servers are usually set to the ISP-assigned DNS servers, but would be set to the IP address of the Windows Server if you are using Windows Server and need to support Active Directory
• Option 150 is set to Voice VLAN IP address on subnets used to connect IP phones

I understand that some SOHO routers lack the capabilities of IOS-based devices. However, the new SA500 in the Cisco Small Business Pro line actually allows you to override the DNS servers used by LAN devices, and can be used on networks running Windows Server.

When using MS DHCP it auto-populates the associated forward and reverse lookup records on the MS DNS server. Am I mssing why you would not want to find internal devise by host names as oppsoed to IP address?