From: Durkin, Michael (MED US) (michael.durkin@siemens.com)
Date: Wed Jan 17 2007 - 00:35:11 ART
Well, there is a difference though.
The way the packets are formed is completely different. I can't recall
the details of the difference right now other than to say that they use
different encapsulation methods. I seem to recall that 802.1Q adds a 4
byte header, while an ISL trunk adds a 26 byte header. Also, the 802.1q
header is placed in the middle of one of the fields (can't remember
where), and the ISL header is on the end.
I am a little fuzzy on this, I am sure there are others out here that
could clear it up though.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
johngibson1541@yahoo.com
Sent: Tuesday, January 16, 2007 9:39 PM
To: ccielab@groupstudy.com
Subject: Re: Mapping 802.1Q VLANs to ISL VLANs
In a switch, a vlan is a vlan, I don't know there is a ISL vlan and
802.1Q vlan.
There are ISL trunk and 802.1q trunk link. I don't know there are ISL
vlan and 802.1q vlan.
John
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