04004b3b   
   XPost: comp.dcom.lans.ethernet, comp.dcom.sys.cisco   
   From: mhostettler@voila.fr   
      
   Hi, Mark   
      
   > they often say, for examplehttp://en.wikipedia.org/wiki/Carrier_Ethernet   
   > that such concepts as "bridge" or "spanning tree" don't scale well to large   
   > networks. What exactly is meant here by "scale" ?   
      
   Bridges are indeed used in network providers.   
      
   Spanning tree is generally not used. If the provider is adding a   
   bridge, STP would disrupt its network too long time, to  converge.   
      
   In Ethernet WAN, we consider connectionless paths (CL) and oriented   
   connection paths (CO). With CO paths, address learning process is   
   useless.   
      
   Best regards,   
   Michelot   
      
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