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QOS for specific IPs


I am trying to give priority to some IPs from the internet, currently we have 7 ips that are pushing data to our network.

So if we want to give this data priority over other data, will below steps work? please suggest

1: enable qos globally using mls qos

2: create a access list to catch those specific ips

3: create a class map

4: create a policy map and attach it to a ip precedence of 5

5: create a service policy and apply it inside of the interface.

we are not looking to police this data , just wanted to make sure the traffic from these IPs are preferred on top of all other traffic.



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Re: QOS for specific IPs


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You'll be doing this on a Catalyst switch?

What I believe you've described will mark the selected traffic switch with IPPrec 5, but such a marking, alone, does not guarantee such traffic will be preferred on the network.  This devices, and any downstream devices, would also need to be configured to treat IPPrec marked traffic "better".

BTW, IPPrec 5 is often used only for real-time traffic.  If this is not real-time traffic, you might want to use a lower IPPrec value (which doesn't preclude still treating such marked traffic "better".)

You might consider:

IPPrec 5 real-time (e.g. VoIP)

IPPrec 4 video

IPPrec 3 VoIP signally

IPPrec 2 critical data

IPPrec 0 default

IPPrec 1 scavenger

Re: QOS for specific IPs


this is a real time traffic and we will be doing this activity on a cisco catalyst 3560.

after marking the traffic with ip precedence 5, is there any steps that we need to do to give this traffic priority ?

or is there a way to give these IP ( 7 of them ) dedicated bandwidth of 22Mbps?

thanks in advance for helping us out.