I hope everyone who had attended our
joint webinar with Cisco about QoS Design and validation, would have
got a better idea on how to design a network with effective QoS
policing. For those who missed the Webinar, you can find the video
presentation here.

In continuation to our Webinar, this
blogs helps you in setting up QoS policies for Live Video Traffic and
monitor them using NetFlow Analyzer.

On a network the Video traffic spread
in three format:

1. Video Conferencing

2. Video On Demand

3. Video Broadcast

Video traffic has very high and
extremely variable packets rate with a much higher average maximum
transmission unit (MTU) when comparing to Voice.

QoS Treatment:-

For classifying the Video traffic to
appropriate QoS values, the device should be capable of identifying
this type of traffic. We can classify the Video traffic using DSCP,
the appropriate DSCP values are:

Expedited Forwarding (EF):-

Packets with EF marking will be given
high priority on the network.

Cisco implements EF service under low
latency queueing (LLQ). EF keeps the high-priority queue very small
to control delay and to prevent starvation of lower-priority traffic.
As a result, packets can drop, if the queue is full. Usually, EF is
most appropriate for VoIP.

Assured Forwarding (AF):-

Cisco design guides recommend AF41
(DSCP value 100010) for video. We are not going to get bettwe
advantage if we treat the Audio portion of Video conference better
than the Video Packets. Therefore, use AF41 as the DSCP value for
both voice and video media in a video conference.

Below is the sample QoS configuration
for Video Traffic:

Creating a Access list for Video
specific traffic:

Cisco#(Conf)access-list 108 permit
ip any any dscp cs4

Cisco#(Conf)access-list 108 permit
ip any any dscp af41

Creating Class:-

class-map Video_Conference

match access-group 108

Policy Creation :-

policy-map QoS-Policy

class Video_Conference

priority 450 30000

Attaching to WAN interface :-

Interface Multilink1

service-policy output QoS-Policy

QoS policy
Monitoring in NetFlow Analyzer:

NetFlow Analyzer will be able to poll the policy applied interfaces
through SNMP and can generate report on performance of QoS policy
along with each class specific Pre-Policy, Post-Policy, Drop Metrics.

Cisco Mediatrace Reports :

If the routers through which these
video traffic are passing through supports Cisco Medianet and
Mediatrace, you will be able to monitor the performance on media rich
traffic on the go. 

Click here to know about Cisco recommended QoS base lines.

Reference :-

http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080094968.shtml

For 30 Day Trial, click Download now.

Thanks and Regards

Praveen Kumar

You Can Learn More About the ManageEngine Product Line By Going to manageengine.optrics.com

The original article/video can be found at Policing Live video traffic and monitoring using NetFlow Analyzer