The ORIGIN option on BGP - what is it for?

Fri Oct 21 11:53:25 UTC 2005

On Oct 21, 2005, at 1:34 AM, Peter Boothe wrote:

> 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?

Mostly load balancing, thought manually setting it via route maps.

-- 
TTFN,
patrick