How can I apply QOS on my network?
The application of QOS is performed on both your local router and across your network routing. It is therefore something which you need to implement on your own equipment and in conjunction with your network provider.
It is important to identify the need for QOS early in your procurement process as not all network solutions can offer end to end QOS. If you require this then you will usually need to purchase an MPLS network offering.
A good example of where QoS is needed is VoIP traffic. VoIP traffic needs to be delivered within a certain time to the destination, or it becomes obsolete. Therefore, QoS should prioritize the VoIP traffic to ensure that it is delivered within a certain time constraint. To achieve this, it is possible within Cisco IOS to queue VoIP with a higher priority than FTP or HTTP traffic and to make sure that if congestion occurs, FTP or HTTP traffic is dropped ahead of the VoIP traffic. Cisco IOS has several mechanisms to do this on a router.