title: Q on priority between the frame with VLAN tag and the frame without VLAN tag
body: <p>Ethernet experts,</p>
  
  <p>I have basic question.
  I'm now studying VLAN tag for Ethernet.
  One field of the VLAN tag is PCP(Priority Code Point), which is 3 bit field and indicates the frame priority.</p>
  
  <p>How about the priority between frame with VLAN tag and frame without VLAN tag ?
  I keep investigating and try to find out the description on IEEE standard (IEEE802.1Q and IEEE802.1D), however can not find out the definition yet.</p>
  
  <p>Any input is highly appreciated. </p>
  
  <p>John</p>