On Mar 27, 2005, at 12:10 AM, Matt Darnell wrote:
Has anyone been succesful pushing a VLAN setting to a Polycom phone via DHCP?
Chicken or the egg! How can the Polycom reach the proper DHCP server
if it is not on the correct VLAN? That's why Ciscos and Polycoms
support CDP, so the CDP-capable switch can supply the correct voice VLAN.
I 'assumed' the phone would reboot with the new VLAN setting and get a new IP address from the DHCP server on the phone VLAN - there would be two DHCP servers.
I can't think of any other way to make it work with DHCP. If it isn't designed to work that way, why would they put the option in the DHCP section.
-Matt
I had always understood that they only supported VLAN discovery via CDP. But reading the 1.4 admin guide it says this...
VLAN ID
See 2.2.1.2.2
DHCP Menu
on page 7
Special Case: Cisco Discovery Protocol (CDP)a overrides
Local FLASH which overrides DHCP VLAN
Discovery.
a. Can be obtained from a connected Ethernet switch if the switch supports CDP.
This seems to imply that DHCP can be used to spec a VLAN.
I too would like to find a way to make this work.
I also do not think the phone would need to reboot. I have noticed being able to change the VLAN and have the tag applied or not without the phone rebooting. Actually about the only thing I can do and not have it reboot:-)
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