Hello @GreekCiscoKid
The auto qos trust command configures the switch to trust the QoS markings on incoming traffic, allowing the switch to make forwarding and queuing decisions based on these existing markings without altering them. This is ideal when traffic has already been correctly classified by upstream devices such as IP phones, routers, or other switches, and you are confident in the accuracy of these markings.
On the other hand, the auto qos classify command configures the switch to actively classify and mark incoming traffic based on predefined criteria, such as traffic type (e.g., voice, video, data...), thus ensuring that the switch applies new QoS markings as traffic enters. This approach is suitable when incoming traffic has not been classified by upstream devices or when consistent QoS markings need to be applied across the network.
Essentially, auto qos classify can give you a solid baseline classification, allowing for further manual adjustment of input/output queues and other QoS parameters to meet specific network requirements. Use auto qos trust when upstream devices mark traffic accurately and reliably, and use auto qos classify when traffic needs to be classified at the switch level to ensure proper QoS handling.
Best regards
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