Catalyst switches use scheduling and transmit queues to achieve congestion management.
All the currently shipping switches in the Catalyst product line support a form of sched-
uling that is more advanced than FIFO. The specific mechanisms differ on a platform basis.
With regard to output scheduling, the QoS marking determines the scheduling and output
queue. In the case of the Catalyst 6500 Family of switches, for example, there are different
queue types and drop thresholds per line module. Other platforms, such as the Catalyst
3500 Family and the Catalyst 4000 IOS Family of ...
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