From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Apr 22 2004 - 14:48:01 GMT-3
Thanks for your response.
So, OK, cos can't be set on frames going out of a regular, but what about
COMING IN to a regular access port.
We know that cos CAN be set when the port is a 802.1q trunk carrying both a
voice vlan and a data vlan, but what if the port is just a regular access
port?
And, if so, where is that carried in the frame since regular ethernet frames
can't carry QoS data?
Tim
----- Original Message -----
From: "William Chen" <kwchen@netvigator.com>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
Sent: Thursday, April 22, 2004 12:26 PM
Subject: Re: QoS on 3550
> Hi
>
> See below:
>
> Best Regards,
> William Chen
>
> ----- Original Message -----
> From: "ccie2be" <ccie2be@nyc.rr.com>
> To: "Group Study" <ccielab@groupstudy.com>
> Sent: Thursday, April 22, 2004 11:56 PM
> Subject: QoS on 3550
>
>
> > Hi guys,
> >
> > I'm trying to understand something which has me confused.
> >
> > Recall these facts:
> >
> > At layer 2, only ISL or 802.1q trunks have fields to carry layer 2 QoS
> info.
> >
> > Regular ethernet frames don't and can't carry any QoS info.
> >
> > Given the above,
> >
> > Q1) Can cos be set on frames coming into or going out of regular access
> port
> > on a 3550?
>
> Not, there is not way to set COS going out of regular access port.
>
> >
> > Q2) If so, how does this work?
> >
> > Q3) Can someone confirm that's there's no problem or Gotcha's on
setting
> > layer 3 QoS on frames coming into or leaving a regular access port?
>
> You can easily test it. Try the "ip accounting precedence" at the
> receiving router.
>
> >
> > Thanks in advanced, Tim
> >
> > _______________________________________________________________________
> > Please help support GroupStudy by purchasing your study materials from:
> > http://shop.groupstudy.com
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Mon May 03 2004 - 19:48:52 GMT-3