Layer 2 vs. Layer 3 to TOR

David Coulson david at
Thu Nov 12 21:09:18 UTC 2009

Raj Singh wrote:
> We are actually looking at going Layer 3 all the way to the top of rack and make each rack its own /24. This provides us flexibility when doing maintenance (spanning-tree). Also, troubleshooting during outages is much easier by using common tools like ping and trace routes. 
I'm confused where STP fits into this. If you're doing /24s to each 
switch, why even bring STP into the picture? Do /31s to each TOR switch 
and use OSPF or ISIS. I don't know too many people who have not had an 
awful experience with STP at some point.

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