Qos within network

I'm trying to setup Qos on my companies smallish network.  I'm not new to networking (not a guru either) but definitely new to Qos.

-We have about 30 users and each user has a PoE Voip phone as well has Desktop computer.

-The desktops connect to the phones as passthrough and the phones have the connection from the poe switch (Adtran Netvanta 1544).  

-The Netvanta 1544 switch hooks up to a Dell 5324 Switch.  We have 2 of these that handle switching for the rest of the devices on the network (copiers, fax server, windows server, etc.)

-Also, we have a Sonicwall NSA 2400 connected to the Dell switches.  That is the gateway.  

-The Sonicwall NSA 2400 connects to an Adtran Total access 908e.  I guess this device is the true gatway but it passes the public Ip addresses to the Sonicwall 2400.  

-I've looked at the Dell switchs and they have default Qos Settings, the Netvanta switch has default CoS setup (no Qos options but I don't know the real difference to be honest).  However, the router has no Qos tagging enabled on any interface.  Are getting true Qos from web traffic if this is not enabled?

-Sorry for the long post here but it's best if you understand the whole picture.  

-Our Qos needs are pretty simple.  We use a web application as a main application and voip is obviously important but we'd like to put less priority on stuff like Youtube (web video streaming).
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Vontech615Asked:
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Sandeep GuptaConsultantCommented:
are you using internet link or MPLS at your WAN?

basically QOS does not make much difference at enterprise level..you should ask you provider/ISP to give you QOS, unless they match your traffic and send it across the cloud you can't get best result even though if you have applied efficient QOS at your set-up.

come back to us to know more.

cheers!!!
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Vontech615Author Commented:
We have (6) T1's that are bonded on the Adtran box.  Then have one ethernet line running to the router (2400). I don't know if our ISP is runnnig QoS or not to be honest.  I guess I can ask them.

I think I've decided to first to put the Voip phones on their own VLAN.  Right now I have everything on VLAN1 (phones, computers, copiers, etc.).  

My question here is I'll need to set up trunk ports between our 3 switches right?

ALso, with the desktops being connected to the desk phones via Gig port on the phone will I still be able to VLAN just the phones?

I tried putting just my port on the PoE switch into a different VLAN and it knocked my phone and computer off the network.

* I'll add that both the IP Phones and Computers are on DHCP.
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vivigattCommented:
You do need trunks if VoIP phones and Computers connected to the phones are not on the same VLAN. The switch port the VoIP phone is connected to must be trunked, since you will have 2 Vlans associated to it. At least one of the VLans must be tagged, of course.
What I'd do would be to tag the VoIP VLAN and keep the other Vlan untagged.
You will need to route DHCP packets from VoIP VLAN to dhcp server, with a new scope, or you will need a DHCP server on VoIP VLAN.
You don't necessarily need to route packets between your 2 VLANs, unless there are interactions between PCs and phones (such as a Softphone app that controls the deskphone or gets notifications from the phone).
Once your Vlan are set, you can organize QoS. You should be able to prioritize packets inside a VLAN and to prioritize one VLAN over another one, or make sure that a particular VLAN gets a minimal bandwidth on a switch/routing device.
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Vontech615Author Commented:
We do have Softphone app on users's desktops. So I'll have to route packets but I think these Advanta 1544's are Layer 3 capable.  I'm just a little stuck on how to get it all configured but I'll do some research.
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vivigattCommented:
You may not need to route packets between phones and desktop if all the signaling is done somewhere else, on a device that has access to the 2 VLANs. All this depends on the implementation. I guess you will have to study it somewhat and make some tests, some errors, correct them etc.
Take care!
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Vontech615Author Commented:
1 more question...   So when I go into the Adtran config it allows me to assign the port that connects both phone and computer to any Vlan (currently at default Vlan 1) so How will assign the Vlan 2 for example to just the phone and not the desktop.  I know that's done via IP addresssing but I'll need to start with the DHCP scope's I guess?  Just a little confused on what steps to do L2 and what steps for L3.
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vivigattCommented:
I think you have to configure the deskphone(s) to use a particular VLAN. Not only the switch. Make it so that deskphone will use Vlan 2.
Trunk Vlan 1 (untagged) and VLan 2 on the switch.
DHCP addressing comes after that.
Enable routing betwwen VLAN 2 and VLAN 1 on the device that knows both VLANs.
Use Static IP addressing at that point and check that routing does work between Vlan 1 and Vlan 2.
Then (and only then):
You will need to create another DHCP scope for VLAN 2, forward to your DHCP Server the DHCPDISCOVER packets emitted by Vlan2 hosts. This is done with a DHCP Relay on the device that routes between Vlan 2 and Vlan 1 (dhcp relay can be named ip-helper, dhcp forward... depending on the routing device...)
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Vontech615Author Commented:
I really appreciate the help here.  

Here's a screen shot of the Adtran switch config and I could be doing some of this from the CLI but this helps with visualizing.  So in this pic basically every port is attached to a phone/computer.  Would I make all the ports Trunk ports?
vlan-trunk.jpg
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Vontech615Author Commented:
Just found the VLAN ID setting on the phone.  That makes more sense now.
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vivigattCommented:
All the ports that are used by phone + computer must be trunked and must "accept" both Vlans
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Vontech615Author Commented:
K, so basically...

1. Create VLAN X for voip in the switch.
2. Set each phone to proper Voip VLAN ID.
3. Change the membership of all 24 phone+computer ports to Trunk mode.

I'll be putting the VOIP Server on the same VLAN and then letting everything else stay on VLAN 1.
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vivigattCommented:
That's right.
You need to take care of the routing too.
At first use static IP addresses, that will be easier
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Vontech615Author Commented:
The adtran switch enables L3 switching by default on the VLANs. So I'm assuming it will know what to do with the traffic from different ID's.  I have  DG setup for my router.

*additionally, because the Adtran switch is doing the L3 switching the other 2 switches can just do L2 function right?  I just have to trunk the ports that run from switch to switch?
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vivigattCommented:
I don't know adtran switches at all. You may have to enable ip routing.
 For the L2/L3 thing, I think it should be OK. You trunk the ports from host<==>L2 switch<==>L2 swicth <==>L3 switch/router. As long as the port are correctly trunked on the whole path, it should work ok.
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Sandeep GuptaConsultantCommented:
for L2/L3 use untagged vlan to work within
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Vontech615Author Commented:
Guptasan26 can you expand a little on your comment?
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vivigattCommented:
You can't use trunks with untagged vlans only, as far as I know.
The first switch (the one that the cord coming from the phone is connect to) must use trunk ports.

According to the 802.1Q standard, the way to identify different vlans in a frame is by adding Vlan ID tag in the frame.  This tag identifies what vlan the frame is meant for.  If you want multiple vlans to pass via a switch interface, those vlans need to be tagged by configuring a trunk port.

Tagging is a L2 thing, by the way since the tag is added to the Ethernet frame.
Your L2 switches then must be able to handle tags and VLANs

http://en.wikipedia.org/wiki/IEEE_802.1Q
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Vontech615Author Commented:
Thanks vivigatt that makes sense.
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