RE: Voice Traffic

Kazi,

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf Of karim jamali
> Sent: Sunday, September 05, 2010 7:05 PM
> To: Kazi Junaid; Cisco certification
> Subject: Re: Voice Traffic
>
> Hi Kazi,
>
> I guess you are looking for LLQ solution and what it does is the following:
> 1.Gives priority to voice traffic by putting it inside a priority queue which gets
> serviced first.
> 2.You wouldn't want your voice traffic to kill other applications, thus you will
> need to put an upper limit to this prioritized traffic, i.e. you are saying I will
> guarantee voice is service first with an upper limit of 1Mbps, if this limit is
> exceeded, well it depends on how the link is doing, if it is fine than than you
> will still have it working perfectly, if the link is congested, you are only
> guaranteed up to 1Mbps of excellent service, more than that you will lose
> the guarantee.
>
> Steps:
> 1.You will need to match the traffic which I guess is the RTP (udp 16384
> 32767)

Assuming this a standards based VoIP solution, you could match on protocol RTP audio, DSCP 40/46, or ACL that specifies voice IP ranges and the UDP range listed above.

However, above this all this, you need to work with your MPLS provider to ensure they are treating your voice as a gold/real-time/insert your favorite most expensive marketing term for priority traffic here. You can queue outbound as much as like, but if your provider isn't doing the same it could be in vain

For LLQ:

http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfwfq_ps1835_TSD_Products_Configuration_Guide_Chapter.html#wp1022204

From a carrier's perspective:

http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBIQFjAA&url=http%3A%2F%2Fwww.globalcrossing.com%2Fdocs%2Fipkc%2Fmpls_qos.ppt&ei=ViWETOjLB4L88Abs_6nzAQ&usg=AFQjCNGr2ego_xozF_67wXLO7RUwGVrmWw

-ryan

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Received on Sun Sep 05 2010 - 23:20:35 ART