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...> - 2016-06-28 11:20:07
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Dear Yihao,
c-bgp is unable to use multiple processors on its own. One approach you
can use is to run multiple instances of c-bgp, each on a subset of the
prefixes you plan to propagate. Please also note that announcing many
prefixes in a large topology will probably require more RAM than you own.
BR,
Bruno
On 28/06/16 10:54, 贾溢豪 wrote:
> Professor:
> There is one another problem I met with c-bgp, and I really need
> you help again.
> After importing data from CAIDA(to simulate the whole Internet),
> the command of cbgp: "sim run" haven't finish yet(more than 24h). I
> notice that cbgp computes on only one core of CPU at my server, and
> I'm not sure the program will successfully complete within the finite
> or reasonable time. The attachments scripts are the command I input
> into cbgp, and I hope you could give me some advise on the
> convergence of the cbgp program.(utilize all cores of CPU to
> acceleration?)
> Thank you!
> 内嵌图片 1内嵌图片 2
>
> 2016-06-16 15:57 GMT+08:00 Bruno Quoitin <bru...@um...
> <mailto:bru...@um...>>:
>
> 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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>>> 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)
>>
>
>
>
>
> --
>
> 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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