From: William Chen (kwchen@netvigator.com)
Date: Thu Apr 22 2004 - 12:36:07 GMT-3
Hi,
Just to remind that if you enable "mls qos", the default is the QOS
marking of the packets reveived by every interface is untrust and thus all
the packets will override to best-effort.
However, if the "mls qos" is not enabled, switch will forward the packet
with the QOS marking unchange.
Therefore, if you set IP Precedence/DSCP in an outgoing interface of
Router A connected to Catalyst 3550, and expect the receiving Router B to
setup policy according to the packets marking. If you turn on "mls qos" in
the Catalyst 3550 but forgot to set the port connected to Router A to trust
the marking, the default is all the packets will be override to best-effort
(DSCP=0, IP Precedence=0)!
Best Regards,
William Chen
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "Yasser Abdullah" <yasser@alharbitelecom.com>; "'Ahmed Mustafa'"
<ahmed.mustafa@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Thursday, April 22, 2004 7:44 PM
Subject: Re: mls command
> Hi guys,
>
> I'm considering just adding the "mls qos" to both Cat's when I take the
lab.
>
> Here's my reasoning.
>
> There might be certain features besides the obvious QoS stuff that require
> this command in order to work properly, for example, certain types of
> access-lists that need to examine QoS data inside the layer 3 portion of
the
> packet.
>
> There's no downside to enabling "mls qos" unless explicitly forbidden.
>
> Does anybody think this is a bad idea? If so, why?
>
> Thanks in advance
>
>
> ----- Original Message -----
> From: "Yasser Abdullah" <yasser@alharbitelecom.com>
> To: "'Ahmed Mustafa'" <ahmed.mustafa@sbcglobal.net>;
> <ccielab@groupstudy.com>
> Sent: Thursday, April 22, 2004 2:19 AM
> Subject: RE: mls command
>
>
> > As per the command reference guide, 'mls qos' is recommended before
> > enabling voice vlan. Until you enter the mls qos command, QOS processing
> > is disabled and all CoS values will be mapped to the same queue (1).
> >
> > Brgds,
> >
> > Yasser
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Ahmed Mustafa
> > Sent: Thursday, April 22, 2004 8:32 AM
> > To: ccielab@groupstudy.com
> > Subject: mls command
> >
> > Is command "MLS QOS" required if the port is configured only for 802.1P
> >
> > For example,
> >
> > interface fastethernet 0/5
> > switchport voice vlan dot1p
> >
> > _______________________________________________________________________
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