From: Ali Mousawi (mousawi.ali@gmail.com)
Date: Sat Oct 04 2008 - 03:12:54 ART
Hello Huan,
Why do we need "mls qos cos override"? Is'nt mls qos cos 1 enough? I am
confused with Cat QoS I dnt like this topic
On Fri, Oct 3, 2008 at 8:07 PM, Huan Pham <pnhuan@yahoo.com> wrote:
> Hi,
>
> How about this simple solution, which overides the CoS values for ALL
> packets arriving from R1, e.g.
>
> SW1#
>
> mls qos
>
> interface FastEthernet0/1
> description == to R1
> switchport trunk encapsulation dot1q
> switchport mode trunk
> mls qos cos 1
> mls qos cos override
>
> If you want to selectively change only packets with CoS5 to CoS1, without
> using policy-map (assumming that there're traffic with other CoS values
> arriving to SW1 from R1), we have to do it indirectly via COS-DSCP map. I
> believe your solution is the good example for this task. I haven't come up
> with another one yet.
>
> Regards,
>
> Huan
>
>
> --- On Sat, 10/4/08, ZZ <zurabz@gmail.com> wrote:
>
> > From: ZZ <zurabz@gmail.com>
> > Subject: Re: QOS on 3560
> > To: "Cisco certification" <ccielab@groupstudy.com>
> > Date: Saturday, October 4, 2008, 6:12 AM
> > and forgot one more thing:
> >
> > No config allowed on R2 and No service-policy on SW1 &
> > SW2
> >
> > On Fri, Oct 3, 2008 at 4:05 PM, ZZ <zurabz@gmail.com>
> > wrote:
> >
> > > Hi Experts,
> > >
> > > I'm practicing QOS stuffs in lab and got a
> > question.
> > >
> > > Here is the topology:
> > >
> > > R1<->SW1<->SW2<->R2
> > >
> > > there is a trunk links between SW1 gig1/0/33 & SW2
> > gig1/0/33, SW1 gig1/0/48
> > > & R1 f0/0, SW2 gig 1/0/48& R2 f4/0
> > >
> > > I'm marking all frames on R1 with COS5.
> > >
> > > Need to see this frames as COS1 on R2. No config
> > allowed on R2
> > >
> > >
> > > R1
> > > f0/0.12
> > > encapsulation dot1q 12
> > > ip add 1.1.12.1 255.255.255.0
> > > service-policy output SETCOS5
> > >
> > > R1#sh policy-map SETCOS5
> > > Policy Map SETCOS5
> > > Class COS
> > > set cos 5
> > >
> > > R1#sh class-map COS
> > > Class Map match-all COS (id 3)
> > > Match any
> > >
> > >
> > > My solution is
> > >
> > > SW1
> > >
> > > mls qos map cos-dscp 0 8 16 24 32 37 48 56
> > > int gig 1/0/48
> > > mls qos trust cos
> > >
> > > -----------------
> > > SW2
> > > int gig 1/0/33
> > > mls qos trust dscp
> > >
> > > mls qos map dscp-cos 37 to 1
> > >
> > > #######
> > >
> > > The config is working fine.
> > > My question is:
> > > Is there any other solution?
> > >
> > >
> > > Thanks,
> > > ZZ
> >
> >
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