From: Sam Joseph (samjoseph747@hotmail.com)
Date: Sat May 29 2004 - 23:16:30 GMT-3
That was right on target Bob. Also, enclosed is an article found on
NetmasterClass Website. URL is given below. It is the sixth article from top
.
http://www.netmasterclass.net/site/lib.php#
Thanks,
---Sam.
>From: "Bob Sinclair" <bsin@cox.net>
>Reply-To: "Bob Sinclair" <bsin@cox.net>
>To: Tomasz Szymaqski <tomasz.szymanski@trecom.pl>,
><ccielab@groupstudy.com>
>Subject: Re: Cos and 802.1p difference/Voice Vlan
>Date: Sat, 29 May 2004 18:11:21 -0400
>
>Tomasz,
>
>On Ethernet you will need some kind of trunking protocol, either ISL or
>dot1q, in order to have a field in which to place the CoS value. 802.1p
>refers to the 3 CoS bits in the 802.1q spec. 802.1p as a "trunking" method
>is just 802.1q with VLAN ID 0 sent on the native vlan. Purpose is to carry
>CoS without actually multiplexing different vlans.
>
>HTH,
>
>Bob Sinclair
>CCIE #10427, CISSP, MCSE
>www.netmasterclass.net
>
>----- Original Message -----
>From: "Tomasz Szymaqski" <tomasz.szymanski@trecom.pl>
>To: <ccielab@groupstudy.com>
>Sent: Saturday, May 29, 2004 4:51 PM
>Subject: Re: Cos and 802.1p difference/Voice Vlan
>
>
> > This answer is not really clear to me.
> >
> > I would like to know if CoS is only in dot1p bits or if untagged
> > (without dot1p/dot1q hader) packets can have CoS assigned??????
> >
> >
> > Dan Shechter Gelles wrote:
> >
> > >dot1p is a field in dot1q.
> > >no dot1p no CoS
> > >
> > >
> > >
> > >On Sat, 29 May 2004, Tomasz Szymanski wrote:
> > >
> > >
> > >
> > >>Hi all,
> > >>
> > >>I have the question about the difference in Ethernet frames (taged and
> > >>untagged).
> > >>
> > >>Where is the difference in CoS in untagged frame and dot1p priority in
> > >>tagged frame.
> > >>The question is about voice vlan and it's behaviour.
> > >>
> > >>I would like to know if the frames from the computer connected to the
> > >>IPPhone are tagged or not by the IP phone and how they are tagged.
> > >>
> > >>I would like to know what happens to the frames if I don't have trust
>on
> > >>the port and default CoS is set to 1. What happens to tagged and
> > >>untegged frame in this case?
> > >>
> > >>TS
> > >>
> >
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