Qos on 5324 for Voip

Question

We have a few 5324 switches, that I need to give maximum priority to the Voip traffic or at least a few TCP ports. Can we set a Qos easily, and if so, how would I assign the levels.   Thanks

Adam N · Answer

Hi

Intially I would suggest you read the whitepaper entitled "Can PowerConnect switches be used in VoIP deployments" which can be found at the following link:-

http://www1.us.dell.com/content/topics/global.aspx/solutions/en/pwcnt_papers

The whitepaper explains CoS and DSCP marking and how to configure this on the switch. If your IP phones are capable of setting CoS values then its even easier, all you need to do is configure the switch to trust the incoming CoS values and create the priority queues. Its all explained in the whitepaper along with configuration examples.

Also here is a link to the chapter in the PC5324 documentation which explains QoS.

http://support.dell.com/support/edocs/network/pc5324/en/UG/qos.htm#1133796

Thanks

StarLog · Answer

Adam,   Thanks for the info, I had already looked at those, and still seem to be a bit confused. The phones are connected via seperate link to the PBX's, one in each building, those PBX's are what is using the voip, between them selves for end-user extensions. i.e. one employee calls another in another building, then the PBX sets up the call.   I only think I need to make the change to the edge switches at each building. Because the PBX units are connected to those switches.   Still confused.   Thanks

Adam N · Answer

Hi,

Let me see if I understand you correctly. Your phones themselves are just normal digital phones which are connected into your PBX system. Your users can make site-to-site VoIP calls via the connected PBX's but you would like to implement QoS on the switches that the PBX's connect into?

Another question, I am assuming your site-to-site PBX traffic must be going over a router at each end? If it is your going to have to implement QoS on your routers as well as the switches or once the PBX traffic hits the router WAN interface its going to get the same priority as all other traffic.

Some points for your to consider:-

1. Are your PBX's capable of marking their VoIP packets with CoS or DSCP? If not then you need to configure this on the switches.
2. If using routers for your inter-site traffic you will also have need to configure CoS / DSCP marking and queueing on your routers.

Hope this helps.

Regards

justingoldberg · Answer

It's the QoS chapter in the users guide. html version of manual is gone: support.dell.com/.../5324UG.pdf

Networking General

Qos on 5324 for Voip

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