From: Huan Pham (pnhuan@yahoo.com)
Date: Sat Oct 04 2008 - 00:07:00 ART
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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