ProCurve 2510G - QoS settings for VoiP

[Der_Hase]

Hello,

we have a new telephone system and now i have to configure QoS for VoiP on the 2510G switches.

On the Interface there are some settings like "Type of Service", "DSCP Policy" and "DiffServices ToS"

Is there somebody can explain, what i have to configure for IP-telephony to use the telephones in our LAN?

Sorry, for me its completely new ;-)

thx for your help

[Chrisd131313]

Hi Der-Hase,

I am making the assumption that you are going to be installing VoIP phones which will be on the same network port as the user's PC (in-line).

You will need to create a new VLAN on your network which you will use for the VoIP server/devices.

Make sure you have routing in place to route between your current VLANs and the new VoIP VLAN.

Tag your uplinks with the new VLAN to all the areas of your network which will need to access the VoIP system.

Add the edge ports to the VoIP VLAN as tagged and keep your PCs' VLAN untagged.

As the VoIP devices are 802.1q compliant they will send their packets out tagged with the VLAN you have created for the VoIP system.

You can then set the VoIP VLAN to "voice LAN" - vlan xx voice

and prioritise the vioce VLAN above all others - vlan xx qos 7

HTH to get you started.

[Matcol]

802.1Q/p Class of Service (CoS)—Ethernet frames can be marked at Layer 2 with their relative importance by setting the 802.1p User Priority bits of the 802.1Q header. Only three bits are available for 802.1p marking. Therefore, only 8 classes of service (0-7) can be marked on Layer 2 Ethernet frames.

Refer to:

http://www.iana.org/assignments/dscp-registry/dscp-registry.xml

When choosing your re-marking.

(Also, http://tools.ietf.org/html/rfc2474)

and http://tools.ietf.org/html/rfc2597

6 or 7 are not intended to be voice values. Setting your QoS to either of these could create various issues. For example,   the built-in hardware queues are usually tweaked to switch voice fastest. If "5" is expected to be voice, (as per the RFCs, etc..) then setting all your voice to "6" or "7" could mean they get shunted into some queues that have limited resources assigned to them.

This will particularly bite you in a multi-vendor environment.

Voice should be 5, Video should be 4.

[Matcol]

Sorry, IP Precedence "5" is "EF" and "4" is "AF41".

[HarveyStephenB]

I have similar issue, trying to keep it simple QOS for a voice vlan with vlan priority QOS.

Your first CLI command worked.

Your second which would work on say a 2910-al would not.

Are you sure 2510 allows vlan priority qos?  I don't see it in the advanced traffic management manual as I do for 2910, etc.

Where is documentation on "voice" vlan setting? 

[Chrisd131313]

Hi, you are right, the 2510 doesn't support VLAN QoS. You will need to use DSCP so you can honour your QoS across both switches.

the below link should give you the pointers you need to get it up and running.

http://h30499.www3.hp.com/t5/ProCurve-ProVision-Based/QoS-for-multiple-DSCP-values/td-p/2349389

HTH.