Long BGP AS paths

Jon Lewis jlewis at lewis.org
Sun Oct 1 18:42:22 CST 2017


On Sun, 1 Oct 2017, sthaug at nethelp.no wrote:

>> Could you list which prefix(es) you saw were being announced with these
>> long AS paths?
>
> 186.177.184.0/23 - still being announced with 533 occurrences of 262197
> in the AS path.

aut-num:     AS262197
owner:       MILLICOM CABLE COSTA RICA S.A.
ownerid:     CR-ACCR1-LACNIC
responsible: Jonathan Cisneros
address:     350mts Oeste del Ministerio de Agricultura, frente a entrada 
principal UCIMED, Sabana Oeste, 0, 0
address:     10108 - San Jos� - SJ
country:     CR
phone:       +50 2 2790099 []
owner-c:     JOC63
routing-c:   JOC63
abuse-c:     ATR9
created:     20130709
changed:     20140804

Anyone care to bet on whether they're using a Mikrotik and did

/routing filter add set-bgp-prepend=262197

and this somehow got truncated to fewer than the "requested" 262197 
prepends?  I'm seeing 562 prepends...which doesn't seem to work out to any 
obvious amount of bitwise truncation/wrap.

----------------------------------------------------------------------
  Jon Lewis, MCP :)           |  I route
                              |  therefore you are
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________


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