North American Network Operators Group

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Re: The ORIGIN option on BGP - what is it for?

  • From: Sabri Berisha
  • Date: Fri Oct 21 08:40:41 2005

On Thu, Oct 20, 2005 at 10:34:35PM -0700, Peter Boothe wrote:

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

Origin is a mandatory transitive attribute which is being used in the
BGP decision algorithm. 

If you have a prefix with the same localpref and aspath-length, the
decision will be made based on the lowest origin-value. IGP wins over
EGP, EGP wins over incomplete. You might use it to influence your
inbound traffic.


please do not throw salami pizza away