Thank you! I've been trying to find the answer to that for a while now. I
don't have a way to test it on our production network or I would have simply
set it up and watched what happened. My bosses get a little upset when I
start playing with our corporate backbone switches just for the fun of it.
:-) silly people... It's not like I'd hurt something...well, there was
that one time when I made the 7513 reboot...during business
hours....twice....oops...
Thanks again!
John Neiberger
> To answer your question, I believe the switch ports, whether trunked or
not,
> still forward based on the table of learned MAC-addresses.
>
> Meaning that a VLANx packet, assuming the destination MAC address is
already
> learned, will only traverse the trunk port towards the valid destination.
>
> ------
> Fred Nielsen [[EMAIL PROTECTED]]
> ------
>
>
> John Neiberger <[EMAIL PROTECTED]> wrote in message
> 24049784.959891399421.JavaMail.imail@tiptoe">news:24049784.959891399421.JavaMail.imail@tiptoe...
> : In this case, though, both switches B and C are in the same VLAN, but I
> : wouldn't want traffic destined for C going down the trunk connected to
B.
> : This would be a waste of time and bandwidth. I'm trying to determine
if
> the
> : trunk will pass ALL traffic for that VLAN, or only VLAN traffic that is
> : actually destined for an endhost on the opposite end of a particular
> trunk.
> : :-) That barely makes sense....heh heh.
> :
> : > If you use ISL, it will pass traffic only if it is destined for that
> : VLAN. It
> : > does frame tagging.
> : > It won't pass unnecessary traffic.
> : >
> : >
> : >
> : > John Neiberger wrote:
> : >
> : > > Ok, I'm suffering from a brain cloud at the moment. So, willing
to
> : suffer
> : > > the comic flames and arrows, I ask the following question:
> : > >
> : > > Assume we have three switches: A, B, and C. A has a fast ethernet
> : > > connection to B and another to C. B and C are not directly
> connected.
> : At
> : > > this point, these are not trunk lines and they are in the same
VLAN.
> : That
> : > > means only traffic destined for B goes down the line to B, and
> traffic
> : > > destined for C goes to C.
> : > >
> : > > Now, if I were to make both of those connections trunk lines,
either
> : ISL or
> : > > 802.1q, would I still have only B-destined traffic going to B or
> would
> : that
> : > > trunk be passing all traffic for that entire VLAN up to B even
though
> : > > C-destined traffic is a waste of bandwidth on the B trunk?
> : > >
> : > > Thanks for the help, as always!
> : > >
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