UC520 with DHCP server on Win Server2003

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Aug 20th, 2010
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I'm implementing a UC520 system for a customer, they have an existing infrastructure which are two numbers of 3560 switches and 1841 Router.

They have about 4 different Vlans configured and the workstation vlan is 30 and the voice vlan is 40.

I have a UC 520 that i deployed and the thing is that we need to use the DHCP server in his domain for the data(workstation) network and the voice network,so we need to disable all DHCP services in the UC520.

The Windows DHCP Server is in vlan 50.

I'm also using ESW520 switches here with the UC520.

I would also want to ensure the ip phones can work connecting through the 3560 switches.

I'm not sure how can I do it,

anybody has a document or something on how to do that ?

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Brandon Buffin Fri, 08/20/2010 - 06:32
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To turn off DHCP:

no ip dhcp pool

Do this for all DHCP pools. You can see these by issuing "show run" or "show ip dhcp pool".

To route DHCP requests to the W2K3 server, you will need an ip helper address on all VLAN interfaces other than 50. For example:

interface Vlan40

ip address

ip helper-address (IP address of W2K3 server)

Hope this helps.


jwaskewics Fri, 08/20/2010 - 12:49
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We did something simpler with a new U540 installation recently.  We used the default VLAN for all data and did what Brandon said re turning off DHCP on the UC and all worked well.  DHCP and DNS are coming from Win 2K SBS server and all are happy.  Of course this may mean MORE work because VLAN 50 goes away.

Just a thought



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