I've been reading a book called End-to-end qos network design and the author sugest a setup which i don't think it works anyway just wanted your opinion about it.
So i have a 3750 access switch with poe, cisco ip phones are conected to it and pc to phone.
The author of the books sugests something like this (copy-paste)
CAT2970(config-if)# switchport access vlan 10 ! DVLAN
CAT2970(config-if)# switchport voice vlan 110 ! VVLAN
CAT2970(config-if)# mls qos trust device cisco-phone ! Conditional Trust
CAT2970(config-if)# service-policy input IPPHONE+PC-BASIC ! Attaches policy
The policy-map references ip voice traffic.
My questions are:
That is a layer 2 port.As far as i understand it the policy map should be put on a layer 3 interface because it references layer 3 traffic
And second on that interface it should also be "mls qos trust cos" so that the cos is only trusted when the device connected is a cisco phone