OSI Layer 8 Issues
You might be wondering what OSI Layer 8 is. Well, there's more
to most network design decisions than just the technical parts; in other words,
there's more to life than just the actual, real, technical seven layers of the
OSI model. People sometimes use the term Layer 8 to refer to
internal politics at the company, business issues, and so onall the stuff that
is above and beyond the pure technical issues.
Often, Layer 8 issues drive some decisions about when to use
VLANs. For example, imagine that the payroll department moves to the same floor
as the IT department. The payroll director comes into your cube and says
something like this: "Odom, I'm concerned that we will be on the same LAN as the
IT group. They might be able to look at sensitive payroll traffic as it passes
over the LAN."
First of all, if you're not me, you would be wondering why he
called you "Odom," but your reply could be this simple: "Uhhh… how about if we
put you on a different LAN? Does that work for you?" He agrees, and not only
that, he's so happy that you accommodated him so easily that he promises to put
in a good word with your boss. All you have to do is configure the switch to put
the right ports into a new VLAN for payroll and enjoy the admiration of your new
friend in the payroll department.
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