This read-create object specifies the VLAN priority to be pushed or swapped onto the S-TAG at this flow point, applicable for push and swaptag control types per the description. Admins use it to set the class-of-service marking carried in the outer provider VLAN tag, distinct from the inner C-TAG priority. For example, when pushing an S-TAG for a Q-in-Q tunnel, an admin would set this priority to ensure the provider network's switches queue the tunneled traffic at the correct service level.