When you connect ip phone to a switch and a pc to your ip phone the recommended configuration is always to use voice vlan and its exactly what you mentioned.
switchport mode access
switchport access vlan 2
switchport voice vlan 7
In this scenario an internal trunk link is formed which will carry vlan 7 as tagged traffic with cos value of 5 and because we have configured switchport mode access so all pc traffic in vlan 2 will be untagged.
So answering yoru quesitons now
1) It should always be seperated by some other vlan that normal data vlan.
2) It should never be same vlan and once voice vlan is configured it will set the cos value to 5
3) The config you mentioned it perfectly fine.
You should never go for vice versa as it is very less desirable to give higher priority to data vlan compared to voice vlan.
Have a look at this link which will guide you more about the same
** Can I define the voice vlan on all access ports/interfaces on the switch?
Yes, you can define it. For example
interface range fa 0/1-24
switchport voice vlan 10
**Is it possible to use in this way?
I really didnt understood your question but by default voice traffic will be given the high priority as compared to data.You have trust the device i.e IP phone when you connect it to the switchport.
**can I configure different QoS levels for different ports on the switch?
Yes, you can do that, but why do you want that? It will never be a good design to implement it which can bring some inconsistency over the network.Its better to have the same policy across your whole network.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.