Re: QOS on Catalyst 2960

And you do see 802.1q tags ?

Irfan Sid @ 24/07/2011 01:40 -0300 dixit:
> 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
> <mailto: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 <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net