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Cisco LAN Switching Fundamentals by Basir Sakandar - CCIE No. 6040, David Barnes - CCIE No. 6563

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Summary

This chapter explains some of the basics involved with enabling QoS on a Catalyst switch. QoS does not create additional bandwidth. Prioritization of certain applications and protocols are becoming essential in today's network. Converged networks that include voice, video, and legacy mainframe traffic have specific delay and bandwidth requirements. Hence, the need for QoS is critical.

This chapter primarily focused on QoS implementation on the Catalyst 6500 switch. In a nutshell, incoming traffic with QoS label at Layer 2 or at Layer 3 is received on the ingress port. The ingress port either allows for the incoming traffic to retain its label or assigns one to the traffic. If trust-cos is enabled on the port, the traffic is forwarded ...

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