Offhand (without research and verification), I would say the native VLAN wouldn't have the 802.1p info since the native VLAN is not tagged at all. Correct me if I'm wrong.
This is an area I need to look into... I had a similar issue last week with a 6509 to 3600 router 1q trunk where LLQ wasn't matching packets based on ip precedence and dscp coming from 6509. Something with the cos mappings I'm sure but just haven't had the time to look into it deeply yet. HTH, erick --- The Long and Winding Road wrote: > 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. __________________________________________________ Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day http://shopping.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63199&t=63128 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
