02-12-2009 01:57 AM - edited 03-15-2019 04:10 PM
Dear Community!
Is there a possibility to set the voice VLAN-ID via DHCP to allow remote phones to get into the correct VLAN?
Tnx in advance!
02-12-2009 02:19 AM
Hi,
If you are talking about DHCP on Cisco Switches its possible, you can define voice VLAN for each port.
Regards,
Iftikhar Ahmed
02-13-2009 12:09 PM
You'll have to configure the Switch Ports in the Voice VLAN. Are your phones connected to a Cisco switch?
I'm not familiar with setting a VLAN via DHCP. Usually you'll want option 150 for TFTP and your other basic settings
02-14-2009 09:18 AM
Correct, you do not set VLAN on DHCP, you do it the other way around, you define DHCP scope for VLAN.
So, in IPT environment you define data vlan and voice vlans on the switchports, then based on the vlan the device connected to the switchport determines which one to use, in IP phone case it picks up voice vlan via CDP protocol, and then of there is a dhcp scope defined for that VLAN on your L3 device, either router or L3 switch it obtains the IP address from the dhcp provider. For the phones to get the IP address of the TFTP server you need to include option 150 pointing to the CM TFTP server on the DHCP scope.
HTH,
Chris
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