Re: [GROW] A new bgpdump tool

[Yasuhiro Ohara <[e-mail]>]

Hi John,

... I'm not sure yet if I'm following here.

I agree there are two perspectives, at least.
One is to compare the growth (time difference) of a
certain ISP's full-route routing table. Another is to
compare routing tables from different ISPs at a
certain time. However, I'm not sure what's the benefit
of comparing routing tables from two ISPs of different times.

The regexp is a great idea (I wonder why I couldn't think of it
myself from the first place). Even though I'm not sure if I can
implement all of them until the next IETF, I will work on it.

Thanks.

Best regards,
Yasu

From: John Kemp <[e-mail]>
Subject: Re: [GROW] A new bgpdump tool
Date: Fri, 06 Mar 2015 10:29:12 -0800
Message-ID: <[e-mail]>

> 
> Yasuhiro,
> 
> We are sort of at two ends of the spectrum here.
> If we are just talking about a simple tool, I guess the
> point I was making was that somehow you probably want to
> consider that there is a time domain.
> 
> For example, if your tool is parsing out ribs.  If it
> could also read those back in, and then do "comm" kinds
> of comparisons, then you could compare two ribs from different
> times.  IE what is common, what is in both, what is only in
> 1 vs. 2, or 2 vs. 1.
> 
> Or a kind of regexp feature might be nice.  You probably
> want ASPATH regexp to add to the prefix matching, as well
> as next-longest/next-shortest matching....
> 
> /jgk
> 
> On 3/6/15 7:19 AM, Sriram, Kotikalapudi wrote:
>>> Yes, I'm interested in route leaks. Now I'm wondering what kind of
>>> functions are beneficial in a BGP dump tool to help people check or
>>> find the route leaks. Please let me know if you have some idea.
>> 
>> Some additional references related to determining AS relations, routing policies, 
>> and route leak detection/mitigation:
>> 
>> "Valley-free violation in Internet routing - Analysis based on BGP Community data"
>> http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6363987&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6363987 
>> 
>> "AS Relationships, Customer Cones, and Validation"
>> http://www.caida.org/~amogh/papers/asrank-IMC13.pdf 
>> 
>> "A Survey of Interdomain Routing Policies"
>> https://www.cs.bu.edu/~goldbe/papers/survey.pdf
>> 
>> "Methods for Detection and Mitigation of BGP Route Leaks"
>> https://tools.ietf.org/html/draft-sriram-route-leak-detection-mitigation-00
>> (to be presented in the IDR WG meeting in Dallas)
>> 
>> Sriram
>> 
>> 
>> 
>