[66836] 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 02:09:24 2004
From: "Alexei Roudnev" <alex@relcom.net>
To: <sthaug@nethelp.no>
Cc: <nanog@merit.edu>
Date: Mon, 26 Jan 2004 23:09:07 -0800
Errors-To: owner-nanog-outgoing@merit.edu
So what? Is is a sugnificant drawback? I do not think so. Both ISL and
802.1q require special interface cards (with extended frame size), and I do
not see any reason, why 26 bytes vs 4 bytes makes big difference. /May be,
the only pro for 802.1q tagging is it's possible implementation on the old
interface cards, which did not allowed extra 30 bytes but allowed extra 4
bytes/.
I am no saying that ISL is better tha 802.1q, but 802.1q is not much better
than ISL, and (in some cases) is even worst.
----- Original Message -----
From: <sthaug@nethelp.no>
To: <alex@relcom.net>
Cc: <nanog@merit.edu>
Sent: Monday, January 26, 2004 9:10 AM
Subject: Re: Any 1U - 2U Ethernet switches that can handle 4K VLANs?
> > 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
