I believe this is what is referred to as router on a stick. The router sees
that the packet is destined for a different network (VLANx) than which it
was received from, so the router processes it, applies it to any access
lists it contains, and then routes it to the appropriate network (VLANy).
>From: Johan Berkel
>Reply-To: Johan Berkel
>To: associate@xxxxxxxxxxxxxx
>Subject: how does ISL work? [1:1893]
>Date: Tue, 6 Feb 2001 14:12:15 -0500
>
>Hi,
>
>I'm CCNA and studying for CCDA.
>Everytime I learn more I get more confused.
>
>A thing which is really confusing me is ISL/trunking and VLAN's.
>I've read that when using a switch with two VLAN's and a router
>to forward packets between them it is necessary that each
>VLAN is in it's own subnet.
>
>Situation:
>The switch receives a frame which its determines to be from VLANx,
>with destination VLANy lets say because of the port it arrived on.
>The switch looks in its switching table finds no L2 entry
>for the MAC address of dest. VLANy and sends the frame to the trunk.
>The trunk runs ISL and goes to the router.
>How does the router decides to send this frame/packet back to the switch
>over the same trunk?
>Is this IP based?
>I mean; if IP address is x.y.z.w then use in the ISL header VLANy or how
>does this works?
>
>So is it necessary for 2 VLAN's if they what to talk to eachother to be in
>different subnets/
>
>Cheers,
> Johan
>
>
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