[c-nsp] Ignoring BGP routes whose origin is own AS

[Rick Kunkel]

Thanks very much.  As far as I could tell, the mystery was starting to lie 
in why it worked before.  And I had no such command in there then...

One other question...  Do most other people use the allowas-in command, or 
do they simply rely on the fact that they've got a more reliable NOC-NOC 
set of connections?

Thanks,

Rick

On Tue, 7 Mar 2006, Oliver Boehmer (oboehmer) wrote:

> Rick Kunkel <> wrote on Tuesday, March 07, 2006 7:48 AM:
> 
>  I just wanted to check one thing for now: 
> > I was reading today, and ran across something I'd read before but
> > forgotten.  It said that BGP speakers ignore routes they hear if that
> > route originates in their own AS, which is a step taken to avoid
> > routing loops.  What I'm wondering here is if that is applicable
> > here.  If NOC1 is announcing routes and NOC2 hears them through the
> > Internet, will it ignore them?  
> 
> Yes, if NOC1 and NOC2 use the same ASN, either will drop the updates
> from the other. You can use "neighbor ... allowas-in <n>" to allow
> updates with at most <n> of your own ASN in the path.
> 
> 	oli
> 
>