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QoS on the MPLS

Posted on 2014-07-14
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Last Modified: 2014-07-16
I have a question on QoS.  We have 4 sites connected on a MPLS circuit with a SonicWall at each site along with a Layer 3 Core switch.  We have a data VLAN of 1 and a voice VLAN of 5.  We have dedicated VoIP switches going to the core switch.  The core switch has a single uplink to a SonicWall on the data VLAN, the SonicWall then goes to the ADVA router out on the MPLS to other sites.  Each site is the same way.  The Core Switch routes the traffic  between VLANs and routes the traffic to the firewalls.  

My first question is do I need to tag the voice VLAN on the uplink to the firewall in order to use QoS?  Or will it pass the QoS tag for the voice traffic and pick it up on the other site with the QoS tagging? Right now the uplink is just an untagged data port and there are routes back to the core switch for the Voice VLAN.
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Question by:Taylor Shipman
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Expert Comment

by:Jan Springer
ID: 40196041
you are confusing dscp markings with vlan tags.

if your voip devices dscp mark your traffic, then on the incoming port for voip, you need to trust the dscp.

if you are passing multiple vlans along a single port, that traffic should be tagged before it reaches the [trunked] port.
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Author Comment

by:Taylor Shipman
ID: 40196044
Alright so on the firewall I will not need to have a port for VoIP in order to use QoS?  The firewall will trust and pass along the mark to the other sites without knowing the VLAN ID?
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Author Comment

by:Taylor Shipman
ID: 40196046
Here is a visual diagram of the environment.
Example.vsdx
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by:Jan Springer
ID: 40196163
Can you export that to jpg?  I do not have a visio reader.
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Author Comment

by:Taylor Shipman
ID: 40196181
Here you go
Example.jpg
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Expert Comment

by:Jan Springer
ID: 40196784
You will need the Vlan ID.

The "trust" is for the DSCP.
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Author Comment

by:Taylor Shipman
ID: 40196910
So just to be clear I will either have to create a port on the Firewall for VoIP or tag the port on the LAN interface as a trunk?

I know the trust is for the DSCP.  What I want to know is if I have to tag the VLAN on the interface to the firewall in order to use QoS at each site?  I would think the firewall will need the traffic separated in order to apply the QoS tag of EF46.  But on the Firewall it gives me the option to select the traffic from which the QoS tag is coming from and on what interface.
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Jan Springer earned 2000 total points
ID: 40200105
If you are passing multiple vlans through an interface, that interface should be trunked and the devices will need to be tagged with the appropriate vlan when entering the network.

So, yes, you will need both the vlan and the trust dscp
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