Re: Help me understand VLAN Technology
- From: "Mike Lowery" <selfspam@xxxxxxxxxxxxxxxx>
- Date: Thu, 29 Jun 2006 13:33:58 -0700
"Frankster" <Frank@xxxxxxxxxxxxxx> wrote in message
news:Ut-dnfb7Sv7gbT7ZnZ2dnUVZ_uydnZ2d@xxxxxxxxxxxxxxx
Okay, here is my high level understanding of VLAN technology. Please tell me
if I a, wrong, and how. Also, please try to keep this high level so even I can
understand it. I'm not really trying to learn all the ins and outs of the
details of configuration. Only if my general understanding is right or wrong.
I view the *function* of a VLAN as, basically, just separating networks (or
subnets, or segments, you choice of words). Small networks usually do this by
adding a router for each segment (or IP grouping of computers). VLANs, in my
mind, simply provide an easier management interface, although proprietary to
the switch vendor, to implement this same segmenting via a software interface
and hardware built into the switch (i.e. multiple virtual "routers" built into
the switch). Bottom line though, providing the same functionality as
segmenting use traditional means (multiple routers) but more efficient in a
larger organization where there may be 10s or 100s of segments that need to
remain separate and separately managed.
Okay... fire away. Can any clear this up for me if I misunderstand it?
Simply stated, VLANs break up broadcast domains and switches break up collision
domains. Routers do both, but they also route packets out various interfaces to
other routers/networks.
Details:
http://www.cisco.com/en/US/tech/tk389/tk390/technologies_tech_note09186a00800a7af3.shtml
More info on VLANs:
http://en.wikipedia.org/wiki/Vlan
.
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