Re: [RRG] Tunnel fragmentation/reassembly for RRG map-and-encaps architectures

[Tony Li <tli@cisco.com>]

On Jan 9, 2008, at 6:27 AM, Eliot Lear wrote:

> This discussion about CEF perhaps should spur some research.  What  
> percentage of the world's networks would need to be cached AT THE  
> EDGES today?

Better yet, we should simply morph this into a more general  
discussion about properties of mapping solutions.
Presumably, the set of identifiers in the world is going to be very,  
very large.  Simply pushing a full map to everywhere is going to be  
expensive, both in space and time.  Pulling has latency issues.   
Reducing the number of places that have a full map seems like an  
attractive solution, but still leaves the push scalability problem,  
albeit with one less order of magnitude of an issue.  For the places  
that have only a cache, how do you deal with cache misses?
What's the right approach here?  Let's have a conceptual discussion  
and leave out the mechanisms, please.
Tony


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