Quality of Service Configuration Tools In Switch/Routers
James Aweya · 2018
The Catalyst 6500 has a rich set of quality of service (QoS) features and configuration tools that allow it to be used as a good reference platform for understanding the types of configuration tools available for switch/routers. The line cards of the Cisco Catalyst 6500 switch/routers support a number of input (receive) and output (transmit) queues per port. The PFC on the Supervisor Engine and some line card types in the Catalyst 6500 are capable of supporting different policing mechanisms. As a queue in a network device begins to fill with data when the traffic load increases or during network congestion, congestion avoidance mechanisms can be used to control data loss and queue overflows. The weighted round-robin (WRR) algorithm can be used to schedule traffic out of multiple queues on each switch/router port where the configuration of the algorithm allows for weights to be assigned to each queue.