Re: Default switch action once receive and 802.1P priority

Marc,

Both your messages are quite correct. When preparing for a CCIE lab, it's
important to find that devil in those details ;-).

In the original question, QoS on the switch was enabled. We can tell that
by the absence of the warning message when running "show mls qos interface"
command. Had the QoS been disabled, this would've been the output:

------------------------------8<------------------------------
Cat4#show mls qos interface FastEthernet0/1
FastEthernet0/1
QoS is disabled. When QoS is enabled, following settings will be applied
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
Trust device: none
qos mode: port-based
------------------------------8<------------------------------

Note the line that warns about QoS being disabled.

That's on a Cat 3560. For those who are studying using 3550s, output is not
identical, but conveys a similar message:

------------------------------8<------------------------------
Switch#show mls qos interface FastEthernet0/1
FastEthernet0/1
QoS is disabled. pass-through mode
When QoS is enabled, following settings will be applied
trust state: not trusted
trust mode: not trusted
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
Trust device: none
------------------------------8<------------------------------

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Sun, Apr 8, 2012 at 08:55, marc edwards <renorider_at_gmail.com> wrote:
> One other note. If mls qos is enabled globally and port is trusted, then
> it will be subject to mappings/ mutations and any queuing.
>
> Marc
>
>
> On Sunday, April 8, 2012, marc edwards wrote:
>
>> If mls qos is set globally and interface isn't trusted it will be set to
>> 0. If mls qos is not set globally, frame header and markings are untouched.
>>
>> Marc
>>
>> On Sunday, April 8, 2012, Marko Milivojevic wrote:
>>
>>> In this case no. Both COS and DSCP will be set to zero.
>>>
>>> --
>>> Marko Milivojevic - CCIE #18427
>>>
>>> :: This message was sent from a mobile device. I apologize for errors
>>> and brevity. ::
>>>
>>> On Apr 8, 2012, at 7:21, "amin" <amin_at_axizo.com> wrote:
>>>
>>> > Hi experts,
>>> >
>>> >
>>> >
>>> > I the switch receive an 802.1P frame with a CoS the default it will
>>> keep it
>>> > as is and do the CoS-to-DSCP mapping? Is that right
>>> >
>>> > Here the default port setting
>>> >
>>> > sw2#sho mls qos int f0/1
>>> >
>>> > FastEthernet0/1
>>> >
>>> > trust state: not trusted
>>> >
>>> > trust mode: not trusted
>>> >
>>> > COS override: dis
>>> >
>>> > default COS: 0
>>> >
>>> > pass-through: none
>>> >
>>> > trust device: none
>>> >
>>> >
>>> >
>>> > Regards,
>>> >
>>> > Amin
>>> >
>>> >
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