Typically, networks operate on a best-effort delivery basis, which means that all traffic has equal priority and an equal chance of being delivered in a timely manner. When congestion occurs, all traffic has an equal chance of being dropped.
When you configure the QoS feature, you can select specific network traffic, prioritize it according to its relative importance, and use congestion-management and congestion-avoidance techniques to provide preferential treatment. Implementing QoS in your network makes network performance more predictable and bandwidth utilization more effective.
If the DCBX willing bit on a device is set to true, the device is willing to accept configurations from the DCB switch through the DCBX protocol. If the willing bit is set to false, the device rejects all configuration attempts from remote devices and enforces only the local configurations.
Here are some docs for you to better understand the DCB:
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