Hi Huaimo,

>     It seems that splitting L1 area A1 into two L1 areas A11 and A12 cannot 
> be automated without people's planning. Some people need to spend their time 
> in deciding where is the boundary between the two areas and selecting a 
> router in the backbone domain for Attach bit for one of the two areas. These 
> corresponds to step 1) and 3) for using Areas. 


Architectural decisions do take careful thought.  That seems to be a common 
requirement, regardless of mechanism.

Tony

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