I tried to summarize the behavior of the switch depending on the configuration of the command "switchport voice vlan".
The attached file indicates:
- the way the frame is encapsulated: Tagged or Untagged
- if tagged: the VLAN used in the Tag
- for Voice & Data frames
- for frames sent:
* from IP phone to Access Switch
* from Access Switch to IP Phone
* from Access Switch to Distribution Switch
Any comment on this output would be appreciated.