[cisco-voip] obtaining IP adress`s - voice / data

[Ryan Ratliff]

When you use the 'ip helper' command on a router (or l3 switch) this  
allows the DHCP server to see what the source IP address of the  
relaying device (the interface that has the ip helper configured) and  
it will assign an address from a scope that matches the source IP.

http://www.cisco.com/en/US/tech/tk648/tk361/ 
technologies_tech_note09186a0080114aee.shtml

-Ryan

On Nov 14, 2007, at 12:28 PM, wayne jackson wrote:


I don`t seem to obtain a straight answer from any data guys- I`m voice

How do I make vlans go to different scoops and different DHCP  
servers- data, voice

question 1

I have a switch which is connected to phones, on the port 1, I have  
configured a native data vlan and voice vlan- native 2, voice vlan  
3-, port 2 have data native vlan 2 , voice vlan 3 . port 3 naive,  
voice vlan 4
Connected to this switch is the CCM using DHCP - test set up.On the  
DHCP I have set up 3 scoop VLAN 2 10.2.1.1 and VLAN 3 10.3.1.1. vlan  
4 10.4.1.1 The first question is how can I make the vlan 2 go to  
scoop configured with 10.2.1.1 and vlan 3 to go to scoop with IP  
address 10.3.1.1 and VLAN 4 go to scoop vlan 4 10.4.1.1.



The next question if the DHCP for data is else where , the switch has  
a IP helper address pointing to it so to turn the request into a  
routing request ? however as the site is running SRST I want to  
configure the SRST router with DHCP which will be used for the voice  
phones only all other devices will use the remote DHCP- how do I make  
the data device go to the remote DHCP and voice to use the SRST and  
choose the correct scoop

is it something like

interface vlan 2
ip helper xxxxx

interface vlan 2

10.2.1.1.

interface vlan 3

10.3.1.1

interface vlan 4

10.4.1.1


many thanks
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