QOS for Media traffic

Unanswered Question
Apr 11th, 2006
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Hi,


One of our office purchased couple of security IP cams. I configured a 3550 switch and separated the video traffic by creating VLANS. I also applied QOS in a basic level. Now, there is chance of increasing the number of IP cams. So, can any one please help in reviewing the QOS policy that i have used for streaming traffic and suggest me the ways of improving the QOS.


My configs are


mls qos


For IP phones

~~~~~~~~~~~~~


interface range fastethernet 0/1-4

switchport mode access

switchport access vlan 2

mls qos trust cos



For Video Traffic

~~~~~~~~~~~~~~~~~


interface range fastethernet 0/5 - 6

switchport mode access

switchport access vlan 3

mls qos cos 3

mls qos trust cos


For Rest of Data traffic

~~~~~~~~~~~~~~~~~~~~~~~~


interface range fastethernet 0/7 - 23

switchport mode access

switchport access vlan 4

mls qos cos 0

mls qos cos override


interface fastethernet 0/24

switchport mode encapsulation dot1q

switchport mode trunk


Thanks


Rajesh

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pkhatri Tue, 04/11/2006 - 17:13
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Hi Rajesh,


Are you confident that that video traffic is marked with a Cos of 3 ?


One other thing.. it's not enough to just trust the cos setting for your video traffic, you also need to configure the schedulers on your outbound queues to give this traffic priority over the data traffic. I can't see that you have done that. I suggest you do so to get any benefit out of this...


Pls do remember to rate posts...


Paresh

kradjesh13 Tue, 04/11/2006 - 18:39
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Paresh,


This is the first time I am applying QOS on a switch.


I went through lot of documents and really lost without knowing what to and how to apply QOS. Atlast I found a doco with the above set of configs. Since it was simple I applied and tested.


As you asked, I am not really sure whether media traffic is using QOS or not. At the moment we use only one cam for testing. Since we don’t have overload the streaming seems to be fine. I guess, when we increase the no of cams I will be knowing the real effect of QOS.


The thing is I have came across lot of documents. But, I don’t know what all needed to be added in the configs for setting up a proper QOS. If you have any sample piece of configs on qos please let me know.


Many thanks for your help and suggestion.


Rajesh


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