Re: MLS QOS: 3560 vs 3550

Are you trying to trust DSCP on the interface or are you trusting DSCP
within the class used to define traffic for your policy? Sorry I don't have
a 3550 in front of me. I believe you can have mls qos trust dscp on the
interface or "trust dscp" in your class. Try the second one.

Mark
#17755, Security

On Thu, Jan 21, 2010 at 12:23 PM, Jack Router <pan.router_at_gmail.com> wrote:

> Responded too quickly.
> "mls qos trust dscp" and "service-policy input TST" cannot co-exist on the
> same interface. When one command is entered the other command is
> automatically removed.
>
>
> -----Original Message-----
> From: Jack Router [mailto:pan.router_at_gmail.com]
> Sent: 21-Jan-10 11:39
> To: ron.wilkerson_at_gmail.com; ccielab_at_groupstudy.com
> Subject: RE: MLS QOS: 3560 vs 3550
>
> Yes there is one and it works. Thanks.
>
> -----Original Message-----
> From: ron.wilkerson_at_gmail.com [mailto:ron.wilkerson_at_gmail.com]
> Sent: 21-Jan-10 11:29
> To: Jack Router; ccielab_at_groupstudy.com
> Subject: Re: MLS QOS: 3560 vs 3550
>
> Isn't there a trust dscp command on the 3550?
> -----Original Message-----
> From: "Jack Router" <pan.router_at_gmail.com>
> Date: Thu, 21 Jan 2010 11:05:03
> To: <ccielab_at_groupstudy.com>
> Subject: MLS QOS: 3560 vs 3550
>
> Hello,
>
> I am testing policing. Here is diagram:
>
> R1--\
> 3560(f0/19)----trunk----(f0/19)3550(f0/3)-----R3
> R2--/
>
>
> I am policing traffic from R1,R2 to R3
> R1 sends packets marked DSCP 10
> R2 sends packets marked DSCP 20
> Policy map is applied on 3550 int f0/19:
>
> Policing seems to work because I can see ping drops on R1 or R2 as soon as
> service policy is applied on 3550, int f0/19.
> My problem is that 3550 rewrites all dscps to 0 as soon as mls qos is
> enabled. On 3560 I can disable dscp rewrites with command "no mls qos
> rewrite ip dscp" but on 3550 there is no such command.
>
> Is there a way not to rewrite DSCPs on 3550 so R3 will receive packets as
> marked by R1 and R2?
>
> I know that there is no 3550 on the lab anymore but just want to understand
> how
> this works...
>
> Thanks,
>
>
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Received on Fri Jan 22 2010 - 11:54:08 ART