Been working on a 3550 practice lab. A particular instruction is as follows:
"Configure FastEthernet 0/2 to support a Cisco 7960 IP phone using 802.1P priority tagged frames. Use the default native vlan to carry all traffic on this port. Trust ingress packet COS values." The "book" solution is as follows: switchport access vlan 20 ( from a previous instruction ) switchport mode access ( to make this port unconditionally an access port ) switchport voice vlan dot1p ( THIS IS PART OF THE QUESTION ) no ip address ( garbage left over ) mls qos trust cos ( THIS IS PART OF THE QUESTION ) spanning-tree portfast ( from a previous instruction ) My solution was as follows: switchport access vlan 20 switchport voice vlan 1 ( native vlan? maybe not because of the static vlan assignment? ) switchport priority extend trust ( MY QUESTION ) no ip address spanning-tree portfast My questions are: 1) what are the differences between the "mls qos trust cos" command and the "switchport priority extend trust" command? 2) what does the "switchport voice vlan dot1p" do as opposed to the "switchport voice vlan 1" ? Am I seeing that only one vlan is being assigned for both the phone and the PC to share? therefore configuration to specifically take note of dot1p frames from the telephone? I have read the command reference for all commands in question. There appears to be a subtlety I am missing, no doubt due to lack of hands on with voice implementations. Thanks. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63128&t=63128 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
