Layer 2 vs. Layer 3 to TOR

David Coulson david at
Thu Nov 12 21:07:35 UTC 2009

Seth Mattinen wrote:
> I'd always wondered how you make a subnet available across racks with L3
> rack switching. It seems that you don't.
You could route /32s within your L3 environment, or maybe even leverage 
something like VPLS - Not sure of any TOR-level switches that MPLS 
pseudowire a port into a VPLS cloud though.

Kinda makes L3 and spanning tree sound like a great option, doesn't it?

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