Re: qos 3560

[Scott Morris <swm () emanon com>]

Look at "show mls qos map" to see the defaults that may be rewriting
your information depending on trust (or non-trust) mechanisms you have
configured.

If you trust CoS, a frame received with cos5 and dscp46 will get
rewritten to dscp 40 with default maps...

"show mls qos interface (intf)" is also good to see status.

Scott



Bogdan wrote:
> hello
>
> indeed, a fellow nanoger gave me this hint.
>
> 1. i had to enable mls qos globally in "network" switches
> 2. set the mls qos trust dscp on the uplinks (ingress port)
>
>
> thanks
>
> ps thanks to andrey.gordon too :)
>
>
>
>
>
> On 11/12/2009 03:21 PM, Brian Feeny wrote:
>   
> > You should make sure that any links that go between devices have trust
> > set.  In your case if your doing DSCP,
> > then make sure each link that goes between devices which must carry
> > tagged packets have trust dscp set.
> >
> > Brian
> >
> > On Nov 12, 2009, at 5:11 AM, Bogdan wrote:
> >
> >     
> > > hello
> > >
> > > i am playing with qos on some devices
> > > - cisco 3560
> > > - cisco 7609
> > > and i have some things that i don't seem to understand.
> > >
> > > 1. in 3560, i enable mls qos, on the ingress port applyed policy map,
> > > classify the packets with acl, mark, all good. on the egress ports i use
> > > srr-queue with shape/share, everything is fine, it is working.
> > >
> > > http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_20_se/configuration/guide/swqos.html#wp1028614
> > >
> > >
> > >
> > > 2. reset to defaults the 3560
> > > in 7606 i pick up a vlan, and apply a policy-map and set dscp 40 on
> > > egress of that vlan
> > > 3560 in uplinked in 7609
> > > in 3560 i can see the "marked" packets, and i have matches on the dscp
> > > set earlier (sh mls qos int xx stat).
> > > the problem is: when i apply the srr-queue in 3560 on egress (towards
> > > the test port), it does not work.
> > > if i enable mls qos on 3560, i cannot match anymore the dscp 40 from the
> > > 7609
> > >
> > > is it normal? do i have to apply the qos stuff (point1) on all switches
> > > i want qos on? i mean, i cannot set dscp in one "core" device and use
> > > that in the whole network ?
> > >
> > >
> > > thanks
> > >
> > >
> > >       
> >     
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