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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