[ppml] Effects of explosive routing table growth on ISP behavior

Scott Leibrand sleibrand at internap.com
Wed Oct 31 11:30:14 EDT 2007

michael.dillon at bt.com wrote:
>> Yes, explosive routing table growth would definitely a 
>> problem for everyone taking full BGP routes.  However, I 
>> think it's a problem that can be addressed, if/when 
>> necessary, by requiring that everyone announce their 
>> minimum-allocation-size covering aggregates, so that folks 
>> can filter out unnecessary deaggregates. 
> I don't believe that it is within the scope of ARIN's charter 
> to require this. The same topic recently came up within RIPE and
> I had a look at their terms of reference and came to the same
> conclusion.

If by "require" you mean "enforce", then you're probably right.  
However, if by "require" you mean "state what should happen" there is 
precedent: the IPv6 guidelines say you have to announce your allocation 
as a single netblock.

> As far as I can see, all decisions about route announcements
> can be freely made by network operators and the only mechanism
> for limiting this is bilateral peering agreements.

Yeah, in practice ISP filtering is the only enforcement mechanism here.  
However, as an earlier poster pointed out, ISPs currently have nothing 
to point to if they want to tell their customers that announcing their 
covering aggregates is the right thing to do.  I think it would be 
useful for ARIN to state that such behavior is expected, either in the 
NRMP or the upcoming NPOG.


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