[j-nsp] BGP Origin Issue

[Ihsan Junaidi Ibrahim]

Jeff,

On 7.6, the aggregated routes are still marked as origin. I have a couple of
and many older 7.0 boxes doing that. I still have to manually mark the
routes as IGP-originated in the aggregate defaults stanza.  

/ihsan

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Jeff Tantsura
Sent: Friday, April 20, 2007 10:27 PM
To: 'Phil Bedard'
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] BGP Origin Issue

Hi,

My bad, described behaviour was true back in 2001.
In nowadays both cisco and juniper set by default origin for aggregated
routes to IGP.

Jeff

P.S. Sorry for all the mails, bloody outlook :) 

> -----Original Message-----
> From: Phil Bedard [mailto:philxor at gmail.com]
> Sent: vrijdag 20 april 2007 15:16
> To: jeff.tantsura at sscplus.nl
> Cc: 'Borchers, Mark M.'; juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] BGP Origin Issue
> 
> Yeah the Cisco is a little strange in those regards, the only time it 
> will not use IGP for the origin code in an aggregate-address is if you 
> are using as-set and one of the contributing routes is incomplete...
> 
> I second the policy of resetting the origin to IGP to take that out
> of the possible path selection.   Using a route-map on the
> redistribute, you
> can set that policy on import into the BGP table...
> 
> Phil
> 
> 
> On Apr 20, 2007, at 5:43 AM, Jeff Tantsura wrote:
> 
> > Hi,
> >
> > 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
> > Jeff
> >
> >> -----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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> 
> Phil Bedard
> philxor at gmail.com
> 
> 


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