Re: Vlan-Based QOS

Agree with Adam.

Just a question on your access ports are they facing the switches or are
they facing routers?

if you enable mls qos on a switch it will re-mark a classified EF packets
to the default dscp therefore make sure you apply the policy ingress to
each switches SVI with or without an ip address assigned to the SVI, or
issue the "no mls qos rewrite ip dscp" command

dong vlan-based also gets you past the root-port caveat when you have
multiple switches where the trust boundary would need to be set inbound
following the root of the STP topology if you we're doing cos/dscp based
qos.

Good luck.

--
BR
Tony
On 29 September 2013 00:28, Adam Booth <adam.booth_at_gmail.com> wrote:
> Hi Sameer,
>
> Getting stats from 3560s don't work like that unfortunately, I guess its
> because this is all happening at the ASIC level, an alternate command "show
> mls qos int <INT> stat" might help you with your verification.
>
> Whenever I'm uncertain with the QoS classification/marking etc with a
> switch I like to have a router involved somewhere and have a policy-map
> which has a class-map that matches what qos marking I think I should be
> seeing and put it on the inbound direction - if the counter increases
> there, things should be working, if everything only hits class-default then
> perhaps there's a problem that needs investigation.
>
> Cheers,
> Adam
>
>
> On Sun, Sep 29, 2013 at 1:19 AM, sameer khan <khanzadap_at_hotmail.com>
> wrote:
>
> > Dear all
> >
> >
> > I am testing  vlan-based qos, using 3 switches. But as far as i can see,
> > it is not working. Can some one please help me with it.
> > i am using the following configs. I dont see any counter ticking for
> "show
> > policy-map int". What is it that i am missing ??
> >
> >
> > 3550----3560----3550
> >
> > mls qos
> > int f0/1
> > switchport access vlan 200
> > mls qos vlan-based
> >
> > int f0/2
> > switchport access vlan 200
> > mls qos vlan-based
> >
> > int vlan 200
> > service-policy input ptest
> >
> >
> > class test
> > match access-group 1
> >
> > policy-map ptest
> > class test
> > set dscp ef
> >
> > access-list 1 per any
> >
> > Thanks
> >
> >
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