From: Aaron Weaver (aaron.weaver77@gmail.com)
Date: Thu Jun 01 2006 - 13:48:24 ART
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12119ea1/3550scg/swqos.htm#1145280
On 6/1/06, Petr Lapukhov <petrsoft@gmail.com> wrote:
> AFAIK, 3550 does NOT support marking at SVI level (3750 does).
>
> At it's maximum, 3550 can do per-port, per-VLAN classification & marking
> at physical interface level.
>
> Back to the task. If you are told to mark all packets with ip precedence 3,
> you should think further. Only IP packets may have ip precedence set.
>
> You may use "mls qos cos 3 override" to manually override all trust states.
> Correctly, by default CoS 3 -> IP Precedece 3 (DSCP 24) for IP packets.
> But that solution would also affect Non-IP traffic.
>
> So it would be better to craft specific service-policy for that task, since
> you are concerned with IP traffic. Also, if you are told to work with
> particular VLAN, that task may be candidate for per-port,
> per-VLAN classification
>
> HTH
> Petr
>
> 2006/6/1, Vincent Mashburn <vmashburn@fedex.com>:
> >
> > You can use class-maps and policy-maps on the 3550. If you are using it
> > as a layer 3 switch, you would apply the service-policy to the VLAN
> > interface. If you are using it as a layer 2 switch, you will need to
> > apply the service-policy to all interfaces associated with vlan 22.
> >
> > So, you would configure an access-list to match all packets, then create
> > a class-map to match the access-group of the list you just configured,
> > then you would create a policy-map that matches the class-map you just
> > configured and sets the ip precedence to 3. Next, you would apply the
> > service-policy as needed.
> >
> > You can then verify it is working by issuing the "show policy-map
> > interface <interface>" command
> > Hope this helps
> >
> > Vince Mashburn
> > Voice / Data Engineer
> > 901-263-5072
> > CCVP, CCNP, CCDA,Network +
> > Cisco IP Telephony Support Specialist
> > Cisco IP Telephony Operations Specialist
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Plank, Jason
> > Sent: Thursday, June 01, 2006 10:41 AM
> > To: ccielab@groupstudy.com
> > Subject: QOS on 3550
> >
> > I am about to flip out. This is really confusing me.
> >
> > One of my tasks has the following on a vendor lab:
> >
> > Configure per port per vlan to follow the following criteria:
> >
> > Int fa0/x is an access port in vlan 22. Make sure that all packets in
> > this
> > vlan are set with an ip precedence of 3. How exactly is this done?
> >
> > I have no issues with any QOS problems when we are talking routers, but
> > this
> > is confusing me. I have looked at the per-port per-vlan basis on the DOC
> > cd
> > but it's still confusing me a bit.
> >
> >
> > -------------------
> > J. Marshall Plank
> > Network Engineer
> > 101 Bellevue Parkway
> > Wilmington, DE 19809
> > E-mail: JPlank@concordefs.com
> > Phone: 302-793-5913
> >
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