Voice VLAN..Need some Insight!

[Netstudent]

So we just rolled out 4 new Nortel 4550 PoE and 2 5500 Poe for the fonality system. My orginal plans were to separate our Voice ip network from our Data Ip network because we were running low on IP's from the Data Network.

So can the 4550 PoE's support a Voice Vlan and a Data Vlan on the same port? Some of our Computers will connect to the Phone and from the phone to the switch. So the computer and phone will share the wire. Then the phone will be in a different subnet than the data.

Has anyone experienced problems with this type of setup?

How will the switch distinguish between the traffic and what are the advantages of this type of setup?

I've only worked with cisco and on cisco switches, you designate a Vlan as a voice vlan with a command. I don't see anything like this with NOrtel.

Any config guides on this subject would be appreciated.

Thanks in advance.

 

[biv343]

You can define multiple VLANs on the 4550. You could have VLAN 1 be for the PCs and VLAN 2 be for the phones. THe phone would be configured with VLAN 2 as the voice VLAN. Packets from the phone will be tagged with an ID of 2, and will be in the voice VLAN. Untagged packets from a PC going through the switchport in the phone will fall to the native VLAN of the port, which would be 1 in this example.

Configure the port as a member of both VLANs, set the PVID to 1, and set the tagging type to Untag PVID Only.

 

[Netstudent]

Thank you. Thats exactly what I had in mind. As far as I knew, this was common practice. But we had some outsourcing guy come in while I was on xmas vacation that said that would be more trouble than it was worth. ARGH! Now our phones and data are on the same IP subnet with no seapration or QoS. BAD!!! I was not here to argue the case and the person that was here didn;t know any better.

 

[DaddyOfThree]

I'm doing exactly what you're trying to-do with about ~ 300 phones.

Here's a link that might help;

http://mysite.verizon.net/michaelfmcnamara/other.htm#voip

There are links within that site that provide specific instructions on how to configure the switch (5520) and phone (i2002/i2004).

Mike

 

[Netstudent]

OKay I have one more question to continue the discussion.

PLease forgive me because I have to relate back to cisco IOS behavior because thats what I have the most experience with.

ON cisco switches, A trunk port is a member of all VLANS by default.

On a nortel switch I read that MLT ports and link parters must have the exact same port level configuration to establish a MLT.

Does this mean I must manually add the VLANS to the trunk ports that I want to traverse the trunk? Or will the trunk automatically let all VLANS through like cisco IOS?

 

[MagnaRGP]

Not sure how to answer the last question, but the QoS is easy. Set all interfaces to trusted and use the QoS wizard to give Premium Service to DSCP 42 and 46. VLAN wont matter from that point on.

 

[DaddyOfThree]

By default all ports will belong to the Default VLAN (VLAN 1). If you make a port "Trunk" it will not behave like a Cisco switch and add all VLANs to that port. You need to add the appropriate VLANs to the ports you wish. If a port is configured as "Trunk" it will add the 802.1q header and allow multiple VLANs to be defined on the port. If a port is defined as "Access" it will usually only allow one VLAN to be defined on that port. I say usually because that behavior has changed with the recent software releases depending on the switch model.

So if you were uplinking ports 47 and 48 to the core with VLANs 1,2 and 3 you would use the following CLI commands;

vlan configcontrol autopvid
vlan ports 47,48 taggging enable
vlan create 3 name "VLAN 3" type port
vlan create 2 name "VLAN 2" type port

vlan members add 3 47,48
vlan members add 2 47,48

mlt 1 disable
mlt 1 name "CORE-UPLINK"
mlt 1 learning disable
mlt 1 member 47,48
mlt 1 enable

Hopefully that answers your question.

Mike

 

[Alainv]

btw, you are not able to place each port of a 4550 as trusted.
In the documentation of that switch you can find the reason and a filter that needs to be configured.

 

[Netstudent]

Does anyone know if using the ADAC function with the new 5520 switch software versions will support other phones besides NOrtel phones? We have Aastra 480i phones but I'm not sure how much functioanlity these phones have with nortel switches.