Randy Bush (randy@psg.com) on November 28:

i have a perl script which takes in the form

133.10.0.0 133.11.0.0 155.162.0.0/15 155.164.0.0/14

and tells me that i can aggregate the first two into a /15.

unfortunately, the actual data as paths can differ

133.10.0.0 2914 2907 133.11.0.0 2914 2907 2501 155.162.0.0/15 2914 155.164.0.0/14 2914

so, what i would like is a tool which takes something like the latter syntax and tells me what the origin ass could aggregate. i.e. i am specifically not inclined to proxy aggregation at this point.

Maybe CIDRadvisor does this, but I have been unable to make it do so.

CIDRadvisor requires aut-num's to be populated to figure out differing as paths. Given the state of aut-num's in IRR, it is not a very useful tool. One could use as paths from a BGP route table dump. But that is only an estimate, as two routes flap the as paths may diverge differently.

randy

Cengiz -- Cengiz Alaettinoglu Information Sciences Institute http://www.isi.edu/~cengiz University of Southern California