Re: aggregation tool wanted

[Cengiz Alaettinoglu <cengiz () isi edu>]

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