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Implementing Cisco Networking Solutions by Harpreet Singh

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Defining the trust boundary

The concept of trust is important and integral to deploying QoS on a network. Recall from the DiffServ architecture that the edge nodes perform the complex functions of classification, policing, and marking, and the core nodes perform the queuing and scheduling functions. Once the edge devices have set DSCP values, the core devices have the option of trusting them. If the device trusts the values, it does not need to do any reclassification; if it does not trust the values, then it must perform reclassification for the appropriate QoS. The core devices trust the DSCP values received from edge devices for efficient scaling of the network.

The notion of trusting or not trusting forms the basis for the trust boundary. ...

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