Re: Ignore DHCP requests from Cisco IP phones
- From: mschunk@xxxxxxxxxxxx
- Date: 19 Jul 2006 17:54:20 -0700
If the phones are not setup manualy w/ both an IP/subnet AND a TFTP
server (DHCP option 150) then they will always send a DHCP cast.
Unless you want to setup DHCP reservations for _ALL_ your hosts, then
your answer is no.
However, what you need to do is:
Cisco's phones kida expect to be pluged into Cisco switches. Not
nessicary if the switches being used can provide the sames
features...Interfaces on Cisco switchs have a speical command called
"Switchport Voice VLAN" in addition to "Switchport access vlan" (and
related command if interfaces are dot1q trunks)
The phones should be placed in thier own vlan, with intervlan routing
enalbed (depends on switch gear) so the phones can still talk to vaious
gatways, Callmanager/astrix, etc, etc, etc.
You need to setup an "ip helpper-address <DHCP server's IP Address
goes here>" for each virtual interface for each vlan on the switch.
Basicaly a DHCP relay Agent.
Then, setup a NEW scope in your DHCP server matching the subnet for the
voice vlan. You can then exlucde the enitre range if you wish.
The important points here is that IP phones SHOULD have their own VLAN.
(the exception being very small installs.)
.
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