Re: [C-bgp-users] a problem about c-bgp in importing as-level topology from caida
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Re: [C-bgp-users] a problem about c-bgp in importing as-level topology from caida
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From: Bruno Q. <bru...@um...> - 2016-06-16 07:57:38
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Hello,
Yeah, re-mapping is indeed a solution to the 16-bits ASN limit.
Perhaps you can contribute a remapping script on the mailing-list.
Cheers,
Bruno
On 16/06/16 03:32, 贾溢豪 wrote:
> Thanks very much for your detailed solution for my problems, I really
> appreciate for your patience in addressing the problems I met. I
> re-number the ASN of all AS to make the topology complete since the
> total number advertised haven't reach 65535 yet.
>
> Thank you again for your kindness!
>
> 2016-06-16 2:31 GMT+08:00 Bruno Quoitin <bru...@um...
> <mailto:bru...@um...>>:
>
> Hello,
>
> Looks like CAIDA has changed its file format since this parser was
> implemented in c-bgp (without notifying me ! ;-)). The version
> used in the regression tests dates back from 2007. Unfortunately,
> I don't have time to update c-bgp source code in the near future
> to provide out-of-the-box support for the new file format.
>
>
> However, it might be possible to adapt your input file so that it
> will be accepted by the current version of c-bgp. There are 3 main
> issues with the file you sent (20160601.as-rel.txt).
>
> 1). Change in delimiter
>
> In the former file format, every relationship was encoded as
>
> <ASx> <ASy> <type>
>
> With the new format, relationships are encoded as
>
> <ASx> | <ASy> | <type>
>
> You can change the delimiter using the following shell code :
>
> awk -F '|' '{print $1" "$2" "$3}' 20160601.as-rel.txt >
> 20160601.as-rel.oldfmt.txt
>
>
> 2). Too long lines
>
> With the new format, some lines have a potentially unbounded
> length. This is the case for the comment line that provides "# IXP
> ASes". That line will not be parsed correctly by the current c-bgp
> "caida parser". You need to remove it. Generally speaking, every
> line with more than 80 characters will be considered multiple,
> separate lines and must be removed for the parser to succeed.
>
> This can be solved by removing every comment line (i.e. lines
> starting with '#').
>
> grep -v '^#' 20160601.as-rel.oldfmt.txt >
> 20160601.as-rel.oldfmt-no-comments.txt
>
>
> 3). 32-bits ASN
>
> ASNs higher than 65535 will not be accepted. There is nothing that
> can be done with these ASNs right now. Relationships involving
> such ASN need to be removed.
>
> It seems 41967 relationships among the 230216 in the file are
> concerned however...
>
> awk '{if ($1 <= 65535 && $2 <= 65535) print $1" "$2" "$3}'
> 20160601.as-rel.oldfmt.txt > 20160601.as-rel.oldfmt-16asn.txt
>
>
> Best regards,
> Bruno
>
>
>
>
>
>
> On 12/06/16 06:05, 贾溢豪 wrote:
>> Hello, everyone:
>> I want to use c-bgp to analyze the AS-level topology. But the
>> AS relationship file-"20160601.as-rel.txt" from CAIDA can not be
>> import by command "bgp topology load --format=caida
>> "20160601.as-rel.txt", neither can other files from caida I have
>> tried. Its error message is "could not load topology
>> "as-rel.2011.01.16.txt" (invalid number of parameters, at line
>> 130)".
>>
>> please help me. Thank you.
>>
>>
>>
>> --
>>
>> Best Regards.
>>
>> *
>> *
>>
>> *Yihao Jia*
>>
>> Ph.D. Candidate
>> Institute for Network Sciences and Cyberspace
>> Tsinghua University
>>
>>
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>>
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>> C-b...@li...
>> <mailto:C-b...@li...>
>> https://lists.sourceforge.net/lists/listinfo/c-bgp-users
>
>
>
>
> --
>
> Best Regards.
>
> *
> *
>
> *Yihao Jia(贾溢豪)*
>
> Ph.D. Candidate
> Institute for Network Sciences and Cyberspace
> Tsinghua University
> Beijing , China. 100084
>
> (Room 4-204, FIT Building of Tsinghua University)
>
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