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Implementing IP quality of service, step 3

Step three of three on how to implement quality of service on Cisco networks.

Step 3: Defining policies for each traffic class

After the traffic classes have been formed based on the network audit and business objectives, the

IP quality of service

IP quality of service is becoming increasingly important as customers add bandwidth-intensive services and applications to their networks. Value-added resellers (VARs) and systems integrators who can troubleshoot and improve sub-optimal performance in a converged network environment have marketable skills. This excerpt from CCNP ONT Official Exam Certification Guide defines quality of service and the three steps to implementing it.

defining a QoS policy

  • Setting a maximum bandwidth limit for a class
  • Setting a minimum bandwidth guarantee for a class
  • Assigning a relative priority level to a class
  • Applying congestion management, congestion avoidance and many other advanced QoS technologies to a class

    To provide an example, based on the traffic classes listed in the previous section, Table 2-2 defines a practical QoS policy.

    Table 2-2 Defining QoS policy for set traffic classes

    Class Priority Queue Type Min/Max Bandwidth Special QoS Technology
    Voice 5 Priority 1 Mbps Min
    1 Mbps Max
    Priority queue
    Business mission critical 4 CBWFQ 1 Mbps Min CBWFQ
    Signaling 3 CBWFQ 400 Kbps Min CBWFQ
    Transactional 2 CBWFQ 1 Mbps Min CBWFQ
    Best-effort 1 CBWFQ 500 Kbps Max CBWFQ
    Scavenger 0 CBWFQ Max 100 Kbps CBWFQ

    Reproduced from the book CCNP ONT Official Exam Certification Guide Copyright [2007], Cisco Systems, Inc. Reproduced by permission of Pearson Education, Inc., 800 East 96th Street, Indianapolis, IN 46240. Written permission from Pearson Education, Inc. is required for all.

  • final step of implementing QoS in an enterprise is to provide a network-wide definition for the QoS service level that must be assigned to each traffic class. This is called , and it might include having to complete the following tasks:

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