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MultiLayer Switching

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DanielBowen

Technical User
Jan 26, 2001
137
GB
I am studying CCNP at the moment and am a bit confused about an explanation of the MLS operation in one of my books and am hopeful that somebody could clear it up for me.

It says" The switch recieves an incoming frame and looks at the destination MAC address in the frame. The switch recognizes the dest MAC of the frame as the MAC of the Route Processor because it recieved it in a layer 3 Hello message and programmed it into the CAM table"

I don't understand why the destination MAC address of the frame would be the route processor, surely it would be the destination host wherever that is

If anyone knows a bit about MLS I would be very grateful

Thanks

Daniel,
 
Hi Dan,
The only reason the destination MAC would be the route processor is that the destination IP address is not on the local subnet. Just as in standard routing - any packet destined for a network that is not local is sent to the default gateway - in this case the default gateway is the route processor.

Hope this helps
Phil. If everything is coming your way then you're in the wrong lane.
 
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