[66838] in North American Network Operators' Group
Re: Any 1U - 2U Ethernet switches that can handle 4K VLANs?
daemon@ATHENA.MIT.EDU (Alexei Roudnev)
Tue Jan 27 02:17:32 2004
From: "Alexei Roudnev" <alex@relcom.net>
To: "Scott McGrath" <mcgrath@fas.harvard.edu>, <nanog@merit.edu>
Cc: <nanog@merit.edu>
Date: Mon, 26 Jan 2004 23:11:33 -0800
Errors-To: owner-nanog-outgoing@merit.edu
Sorry; of course, I meant _change MTU_.
>
>
> Both the ISL _and_ the Dotq headers are stripped off at the trunk
> interface so they _both_ change the packet size but neither alters the
> payload.
>
>
> Scott C. McGrath
>
> On Mon, 26 Jan 2004 sthaug@nethelp.no wrote:
>
> >
> > > ISL _DOES NOT CHANGE_ packet size.
> >
> > An 802.1q tag adds 4 bytes to the Ethernet frame.
> >
> > ISL encapsulation adds 30 bytes to the Ethernet frame.
> >
> > Steinar Haug, Nethelp consulting, sthaug@nethelp.no
> >
