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Performance issues when QoS is enabled on a Cisco Catalyst 4500 switch running CatOS system software
When Quality of Service (QoS) is disabled, unicast traffic is assigned to queue 1. Broadcast, multicast, and unknown traffic is assigned to queue 2. If QoS is enabled, but the Class of Service (CoS)-to-transmit queue mappings are not modified, switch performance can be affected. This occurs because all traffic is assigned to queue 1.
To correct the performance issues, modify the CoS-to-transmit queue mappings if QoS is enabled.