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Author Topic: May be creating my own headache....  (Read 1945 times)

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Offline andymorph

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May be creating my own headache....
« on: March 21, 2014, 05:05:59 AM »
So - its a bit of an odd one - we have a lot Nortel switch's at different sites - all the switch ports are set up to 'un-tag all'. 

At one of our sites some time ago a new vlan was set up for voice, and everything seemed to be working ok. Phones were manually taging vlan 17 (the weird thing being the default vlan was set to 11) and they all picked up dhcp ok (even though the port was set to un-tag all???)- now someones re-booted a phone and it's saying dhcp server unreachable.  Now to be honest if the phones tagged manually with vlan 17 and the ports set to untag all, and the default vlan is 11 - thats what i would expect - i don't know how the previous people got it working - anyone got any ideas ?

The other things is - and I've read some stuff on the various tagging options - If i set the port to tagPvidOnly - then the phone picks up its phone vlan correctly as i would expect.  If i select untagPvidOnly - it wont pick up the vlan 17 when the default is set to 11 and the phone is being told to manually tag vlan 17.  Is that right ? from what I've read it should be the other way round ?

Confused......
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Offline Flintstone

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Re: May be creating my own headache....
« Reply #1 on: March 21, 2014, 08:50:16 AM »
Hi andymorph,

If using DHCP then this is typically the best practice:

Data Vlan on port is untagged and date DHCP scope setup with an option to reply to an IP phone to set the voice Vlan.  The IP phone reboots to use the new voice Vlan where new voice DHCP scope sets signalling server etc.  Just make sure that the tagged PVID is set to the same voice Vlan or nothing will work.

CheerZ and good luck
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Offline TankII

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Re: May be creating my own headache....
« Reply #2 on: March 24, 2014, 09:51:10 AM »
ADAC auto-configures untagpvidonly when a detected device is attached.
In the Cisco world you would have have the data VLAN access and the voice vlan trunk - same scenario.
So, for a manual VOIP config, you want untag PVID only enabled, VLAN 11 is the PVID, and 17 would be a tagged VLAN on top of that.  Your DHCP parameters will let the phone know to use tagging and the tagged VLAN is 17.
TankII
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