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The ORIGIN option on BGP - what is it for?

  • From: Peter Boothe
  • Date: Fri Oct 21 01:35:39 2005 
What makes you mark routes as ORIGIN: IGP vs ORIGIN: EGP?

I just checked out the latest routeviews snapshot to see what the origins
of various routes were set to.  The command line
 $ bzcat oix-full-snapshot-latest.dat.bz2 | sed -e 's/.* //' | sort \
     | uniq -c | sort -nk1
Gave me a bunch of crap from overly-long lines, and then
   9091 e
 682087 ?
7560175 i

Which means that out of 8,251,353 routes in routeviews, only 9,091 are
marked as ORIGIN: EGP, while 682,087 are not configured as one or the
other, and the other *7.5 million* are marked ORIGIN: IGP.

So my question is:  What do people use ORIGIN: EGP vs ORIGIN: IGP to
distinguish?  What makes a route EGP vs. IGP to you?

	-Peter

--
Peter Boothe
Graduate Student in Computer Science
Beyond BGP Project
University of Oregon
http://soy.dyndns.org/~peter