Re: QOS on Catalyst 2960

Yes I have a host connected to the trunk on the same switch, and the
ethernet frames going out do not have the Cos marking on them.

On Sun, Jul 24, 2011 at 2:18 AM, 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
>>
>>
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>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Sun Jul 24 2011 - 07:40:57 ART