Re: QOS on Catalyst 2960

Hi Guys..

This is working :) I was using wireshark to capture the packets on my PC,
but my PC was not receiving the VLAN packets, I had to tweak the NIC card
registry to receive the VLAN tags which had the Cos value in them.

Thanks for all your help...

On Sun, Jul 24, 2011 at 3:28 PM, Alexei Monastyrnyi <alexeim73_at_gmail.com>wrote:

> Hi Irfan.
> We are doing the same sort of marking in production (2960/3560/3750 access
> switches) but using dscp instead of cos, all works fine.
>
> You can try and check show mls qus interface stat output for both
> access-port and trunk port in question. You may be able to see some helpful
> counters increasing there.
>
> HTH
> A.
>
> On 7/24/2011 5:50 AM, Irfan Sid wrote:
>
> 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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sun Jul 24 2011 - 17:50:06 ART