Summary: The draft defines YANG models for VLAN and flexible encapsulation on sub-interfaces. It is technically solid and aligns well with existing interface and VLAN models.

Questions: 
- Given that most commercial routers already implement mature sub-interface VLAN configurations, and are unlikely to change their operational behavior, could the authors clarify whether the intent of this model is purely to provide a standardized YANG abstraction for management systems rather than to influence device-level configuration semantics?

- How is this model intended to coexist with the bridge-based VLAN model (IEEE 802.1Q / RFC 8919)? Can both be used on the same device or interface?

Minor comments: 
- Need to clarify operational behavior when devices support both bridge-based VLAN configuration (per IEEE 802.1Q / RFC 8919) and sub-interface–based VLAN configuration (as defined in this draft), particularly if the same physical port could be referenced by both models.

Best Regards, 
Linda Dunbar