[j-nsp] BGP Origin Issue

Jeff Tantsura jeff.tantsura at sscplus.nl
Fri Apr 20 05:45:36 EDT 2007


Actually there's a situation where you could get hit by differences in
"origin" setup.
By default Cisco, when aggregates, marks origin as IGP while Juniper does
incomplete. If you have got more than 1 BGP sessions with a same peer and
they aggregate on the peering routers where 1 is Cisco and another is
juniper... guess what :)
That's why resetting of origin to IGP on your borders is a good idea.

Just my .02 cent

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-
> bounces at puck.nether.net] On Behalf Of Borchers, Mark M.
> Sent: donderdag 19 april 2007 23:03
> To: 'juniper-nsp at puck.nether.net'
> Subject: Re: [j-nsp] BGP Origin Issue
> I'll apologize for posting a red herring to the list.  Looking further I
> believe that by diabolical coincidence, the origin-incomplete routes were
> also carrying prepends that prevented them from showing up as active
> routes
> anywhere.  The ones that were visible on the Internet were in some cases
> not
> prepended and in other cases more-specifics that weren't being announced
> elsewhere.  I jumped on the origin attribute too eagerly.
> Mark
> > -----Original Message-----
> >
> > Based on the fact that nobody has said "Yo dummy, JunOS never
> > re-advertises
> > prefixes with origin incomplete", I'm going to do more
> > detailed checking on
> > the looking glasses.
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