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limitations of QoS in a congested link

Dear Friends,

I understand that QoS is designed to provide good service to sesitive traffics like Video and Voice in a Congested link.

We also have implemented the same in our network to get better support for our Voip and other applications.

Last week we had a request from one customer to enable QoS for video at their site inorder for a better Video conferece carrying out this week.

We have configured dscp 63 (in class AF41)at the router, note that the utilization of this link high.

Last day we received a feedback that the video conference session breaks for abt 3 to 4  times and each time they requires to reconnect it.

My believe is QoS should perform well in a congested link, thats what it designed for, right ???

Kindly advice is there any limitations in QoS to support in a congested link or any other changes to notify while enabling QOS for application like Video.

Thanks in advance

Riyas RAsheed                  

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Super Bronze

Re: limitations of QoS in a congested link

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Posting

Video can be very bandwidth demanding in short term time intervals.  I.e. video's short term bandwidth demand can be much, much higher than its nominal or average bandwidth usage.  Real-time video, like video conferencing, also often has tight timing requirements, so when there's a burst, you don't want to delay it.

Ideally you want to treat video conferencing video like LLQ/PQ and have sufficient bandwidth that there's no to very little queuing.

Marking video AF41 can mean much or mean little.  Many additional variables apply.

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