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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