[ppml] Policy to help the little guys

Joe Maimon jmaimon at chl.com
Thu Mar 20 12:35:39 EDT 2008

David Williamson wrote:

>>>Can you explain to me how a PI /24 would be in any way different from
>>>an otherwise identical PA /24?  
>>In theory, filtering on RIR boundaries should be much safer if 
>>multihoming with smaller prefixes was done with PA space.
>So, you simply repeated the assertion I was questioning, but with the
>words "in theory" in front of it.  Please explain this theory, as I'm
>not familiar with it.  

The difference would be in the likelyhood that the PA /24 is reachable 
through the PA aggregate prefix even if it filtered. Hence, safer to filter.

This can probably be analyzed and I think actually was fairly recently.

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