Enabling QoS on the router

Hello
I am pretty raw on qos in layer 3 and let me know if Miss me something, or one that is most simple/better way to do this. I have a standard c881 cisco on my provider MPLS network and I'm trying to do the router on location1 qos in the router on guest place.2.
I'm tagging 3 types of traffic to give priority and bandwidth reserved for some and shape the other, I mark with access-list, voip, 1 based on the ports, important traffic traffic traffic 2 based on ports. I haved create the group class cards matched access those access the lists, then the political cards on these classes and that's where it's a blur.

AS FAR AS I KNOW:
(1) I must apply the marking map policy on the entry of my local lan and the law enforcement out of my output interface?
(2) QoS applies when theres is congestion on the network?
(3) display all types of qos are, you have to choose, or you can mix them I'm confuse between DSCP and IP which is the best priority
(4) after all this don't I have still have to control the interface as fair-queue or simply by the interface of police am good?

* I have no control over the provider's on the MPLS router and I do not have a managed switch

Thank you for everything I want to know if I'm in the right direction.

OK quite a general question, you asked, but I'll try my best to answer them for you. Yes, you must mark your packages, you can do this entering the LAN interface that works perfectly. Mark using IP (0-7) prec or DSCP (https://www.tucny.com/Home/dscp-tos). This link will give you the numbers for both the DSCP or IP prec markings in decimal form and by class name. Personally if you are a beginner to QoS I think fair use IP prec sound much simpler.

Prev IP you can skip classes 6 & 7 are for control, and routing protocols that are (dependent on platform of course) marked by the router automatically must be preferred. Class 5 is usually used for voice traffic, 4 for video, 1-3 for data traffic according to its importance and 0 for traffic best effort.

So the first step is to decide what you want mark to what levels. Create ACLs or similar to match the traffic you want to match, then mark this traffic to the previous IP.

Then on the outbound queue to the provider you want to prioritize. So if you have the voice traffic and you marked it IP prec 5 (exp its often called) so usually you would setup a queue to low latency to ensure that traffic is always priority over all others and sent immediately - reason being to reduce jitter causing major problems to voice packets. Do you this by using the priority order. Be careful with this command as the bandwidth that you put in after the declaration of priority is also a policeman to that number. Then in the other class-maps you match other numbers of IP precedence and use 'bandwidth' instructions to give them specific levels of bandwidth - are not controllers but package corresponding to these statements is less preferred than those corresponding to the queue of "priority".

As below:

http://www.Cisco.com/c/en/us/support/docs/quality-of-service-QoS/QoS-PAC...

This part is more complex and may not be necessary depending on what you do, but you can do a few child-parent, formatted at this time as well. Some people will create a parent policy map called the previous policy card in it and the EIF of the circuit you have forms of PSI. This helps avoid maxing out the link congestion and better deals in gusts only one traffic profiles policeman. Or you can just put controllers in your class cards rather than statements of "bandwidth" If you know what each class requires.

Finally and probably the forest hardest as it might involve talking to your access provider, make sure that they carry your brands through their base to your other sites. If they are, you should be able to create a political map on your other sites entering the WAN corresponding to different brands of IP precedence. You can then send the test traffic and you should see the stats of policy-plan of traffic on the corresponding end if the ISP realizes your markings. Most do so.

Hope that covers everything you need, please rate answer.

Tags: Cisco Network

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