Re: QOS on Catalyst 2960

One more thought - there are some good free classes out there. The IPexpert
one is good, on facebook here is the link:

http://www.facebook.com/home.php#!/IPexpert?sk=app_7146470109

.

On Sat, Jul 23, 2011 at 11:03 PM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> Hey team,
>
> Good evening to all and I hope this finds each of you doing well.
>
> I love this line "cisco Qos is good in theory, but a pain in practice.
> please help :( "
>
> After reading this line, I can agree that all the options avail / "nerd
> knobs" and detail functionality can be over whelming... so with this said,
> for the lab, learn the CLI ... in the real world check smart port macros and
> see if they fit. 9 out of 10 times they will work just fine for whatever
> task is at hand...
>
> I might suggest to configure this with smart ports and then see what config
> is automatically done for you. A lot of configs are done automatically ...
> so a good learning this is.
>
> To your earlier question, are you asking why the switch is not changing the
> L3 header to make the DSCP value to 24?
>
> Was the packet originally marked as 24? If so, why not just trust the
> DSCP? Hummm ...
>
> Perhaps it is not clear what you are trying to accomplish. If you have a
> phone attached, try and smart port and then check the 75 lines of config
> added, if you understand all that is being done, then you have a good grasp
> on L2 Qos. ;-)
>
> HTH,
>
> Andrew Lissitz
>
>
>
>
>
> On Sat, Jul 23, 2011 at 7:18 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:
>
>> May I ask how are you capturing the packet to validate that it is not
>> working ? Do you have a host connected to the trunk ? (i.e. a PC ?)
>> Are you seeing the 802.1q tag ?
>>
>> Cause it should work, it does on my 2950 :)
>> -Carlos
>>
>> Irfan Sid @ 23/07/2011 16:50 -0300 dixit:
>>
>> cisco Qos is good in theory, but a pain in practice. please help :(
>>>
>>>
>>> I have a 2960 Catalyst switch with LAN Base.I have set my inbound cos
>>> value
>>> to be a configurable value of cos 3 on fa0/2 (to mark all inbound
>>> frames). I
>>> understand from Cisco documentation, that this COS value will not be
>>> written
>>> into the Ethernet frame, but used to derive an *"Internal"* DSCP value or
>>> QOS Label if you will. This internal DSCP is derived from the COS-DSCP
>>> map,
>>> which in my case maps Cos3 to DSCP 24. (cs3)
>>>
>>>
>>>
>>> This internal DSCP value of 24 should then be written back to a COS
>>> value
>>> if the outgoing interface is a trunk based on the DSCP-COS Map. In my
>>> case
>>> which is using the default mapping of DSCP 24 being mapped to Cos 3.
>>> However
>>> when I run a packet capture on the outgoing interface, I do not see the
>>> frame marked with Cos 3.
>>>
>>>
>>>
>>> Below is my configuration, please can you advise....
>>>
>>>
>>>
>>>
>>>
>>> mls qos map cos-dscp 0 8 16 24 32 46 48 56
>>>
>>> mls qos
>>>
>>> !
>>>
>>> interface FastEthernet0/1
>>>
>>> switchport mode trunk
>>>
>>> !
>>>
>>> interface FastEthernet0/2
>>>
>>> switchport access vlan 100
>>>
>>> mls qos cos 3
>>>
>>> mls qos cos override
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> ______________________________**______________________________**
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>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> ______________________________**______________________________**
>> ___________
>> Subscription information may be found at: http://www.groupstudy.com/**
>> list/CCIELab.html <http://www.groupstudy.com/list/CCIELab.html>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net