Re: [RRG] Thoughts on the RRG/Routing Space Problem

[Tony Li <tli@cisco.com>]

>  I don't see how we'd get incremental deployability with truly  
> split address spaces.


One way would be to split them in such a way that they jointly  
remained syntactically similar to the original address space.  This  
is one of the cuter things about GSE.  Then new generation systems  
could recognize them as split (via a compatibility bit someplace) and  
to legacy systems, it would appear to be a legacy address.


> If we are able to constrain BGP tables to only transit ASes, the  
> DFZ becomes a lot smaller and we can afford to let everyone, even  
> home users, multihome with PI space.  (Of course, there's a hidden  
> assumption there that the number of transit ASes will remain under  
> control, but I haven't seen anyone dispute that.)


There's also a hidden assumption there that you can do that.  One  
practical definition of PI space today is that your prefix is in BGP.

Tony

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