- Written by Cheng-Hung
- Posted on July 1, 2026
- Updated on July 3, 2026
- 35 Views
VLAN COS and IP DSCP values in a packet may be inconsistent. Without this feature, regardless of the interface's QoS trust mode, VLAN tagged packets always use the VLAN COS value as the input priority for PFC PG selection. This can lead to unpredictable PFC behavior. This feature allows tagged packets to use the QoS trust mode as the source for PG selection, instead of always using VLAN COS. This unifies the behavior for tagged and untagged packets, ensuring consistent PFC operation.