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.
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