This article - "A Simple Quality of Service Design Example" is a very good starting point for understanding the EOS Qos architecture and starting a Qos design.
Some points:
- 3 ways in the ingress points to map packets to Tx queues:
- qos cos trust + cos-tc map
- qos dscp trust + dscp-tc map
- service-policy + policy-map
- 3 big categories of traffic:
- network-control = control plane
- latency/jitter sensitive traffic
- best-efforts = scavenger traffic
- qos profile =
- policy-map for input
- tx-queue set for output
- "no priority" in a tx-queue, all lower queues become RR
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