On Thu, Sep 02, 2010 at 04:24:58PM -0700, Martin Casado wrote:
>  I think you have a basic misunderstanding of L2 learning.  A
> typical switch pipeline operates as follows (ignoring bcast/mcast):
> 
> - packet enters switch
> - lookup destination MAC in L2 table
> - if match, send it out of port associated with MAC table
> - If unknown, flood the packet (along the associated broadcast tree)
> and learn its MAC (associate with the ingress port)
> 
> This is done for all packets, not just broadcast.

...except that broadcast packets skip the "lookup destination MAC" step
and always get flooded.

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