[isp-bgp] ISPs looking at AS numbers ..

["Tulip Rasputin" <tulip_rasputin@...>]

Hi,

I have a general question.

Do the ISPs ever look for some particular AS number in the BGP AS_PATH and 
then decide what action they need to take based on the AS number(s) present 
in the BGP AS_PATH. For instance, does it happen that an ISP receives some 
BGP paths, but because of some political, social, ecnomical, DOS attack, etc 
reasons decides that it doesnt want to accept this path because some 
particular AS number is present in the BGP UPDATE.

Or, if there is a mutual disagrement between two ISPs, and one doesnt want 
his traffic to traverse the other's AS number.

Does this sort of thing ever happen? Are such policies normal in the ISP/IX 
scenarios?

Thanks,
Tulip 







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