[cisco-voip] IP phone DHCP question or two

[Tim Reimers]

Hi all -

 

What are all the options for forcing an IP phone to get a new IP
address?

 

I know of:

-          Resetting it (I think) (how does one globally reset all
phones in UCM?)

-          shut/no shut the port

-          int range (whatever to whatever) and inline power
never/inline power auto 

 

I want to switch from Cisco router based DHCP to Microsoft DHCP

 

My plan would be:

Disable the ip dhcp pool on the cisco router for a given Vlan/subnet

Enable the ip helper addresses

Restart the phones and they would pull IP addresses from the new DHCP
server.

 

I know Microsoft devices (aka XP, win7 workstations) tend to know their
old IP and will sometimes cause an IP conflict when changing DHCP
servers, 

even if you reboot them they sometimes conflict.

 

Do Cisco IP phones have that same problem, or once they reset do they
forget all about any IP they once had, and go get a new one from the
DHCP server

(obviously, if the DHCP server has a lease for the phone, it gets the
same IP back, but that's not the phone's doing..)

 

thanks, Tim

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