From: Ahmed Mustafa (ahmed.mustafa@sbcglobal.net)
Date: Fri Apr 23 2004 - 01:56:26 GMT-3
Yeap ! You are right.
Brian/Brian,
Can you guys tell us which source is correct.
According to solution guide, If MLS is disabled packets are rewrite with
COS 0, but the source below from Cisco states opposite:
If mls enabled, packets will be re-written with COS 0
If mls disabled, packets will be unchanged.
Regards,
Ahmed
----- Original Message -----
From: "William Chen" <kwchen05@hotmail.com>
To: "Ahmed Mustafa" <ahmed.mustafa@sbcglobal.net>
Sent: Thursday, April 22, 2004 9:27 PM
Subject: Re: mls command
> Hi,
>
> I don't know what the WB saids,
>
> But, it is the link in DocC, you can take a look. Besides, I've tested
it
> before.
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12119ea1/3550cr/cl
i1.htm#1862510
>
> Best Regards,
> William Chen
>
> ----- Original Message -----
> From: "Ahmed Mustafa" <ahmed.mustafa@sbcglobal.net>
> To: "William Chen" <kwchen@netvigator.com>; "ccie2be"
<ccie2be@nyc.rr.com>;
> "Yasser Abdullah" <yasser@alharbitelecom.com>; <ccielab@groupstudy.com>
> Sent: Friday, April 23, 2004 9:25 AM
> Subject: Re: mls command
>
>
> > HI William,
> >
> > I thought it was opposite and that is per Internetwork solution guide,
Lab
> 7
> > task 1.6 that states that if the command MLS QOS is not enabled then
> switch
> > will rewrite all the frames with the COS of 0, but you are saying that
the
> > frames will be send unchanged if MLS QOS is not enabled.
> >
> >
> > ----- Original Message -----
> > From: "William Chen" <kwchen@netvigator.com>
> > To: "ccie2be" <ccie2be@nyc.rr.com>; "Yasser Abdullah"
> > <yasser@alharbitelecom.com>; "'Ahmed Mustafa'"
> > <ahmed.mustafa@sbcglobal.net>; <ccielab@groupstudy.com>
> > Sent: Thursday, April 22, 2004 8:36 AM
> > Subject: Re: mls command
> >
> >
> > > 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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