[j-nsp] aggregates - active/passive option

[Joseph Soricelli]

Actually, aggregate routes only have 2 next hop options - reject and
discard. Reject is the default next hop and is what you get with aggregate
route x.x.x.x <cr>. To get an IP next-hop assigned to an aggregate route
(from a contributor), you need to configure a generate route.

-joe

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joe Soricelli
Director of Education Services
iPath Technologies
www.ipath.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-
> bounces at puck.nether.net] On Behalf Of C. Hagel
> Sent: Friday, February 04, 2005 10:54 AM
> To: Bostjan Fele
> Cc: juniper-nsp at puck.nether.net
> Subject: Re[2]: [j-nsp] aggregates - active/passive option
> 
> All,
> 	The "passive" option WILL install the aggregate route when there
> are no active contributing routes (as will a "generate route").  When
> you create a aggregate route without the "passive" switch and there are
> no contributing routes, the aggregate route will not be active and will
> not be passed on.
> 	For next-hop options there actually are 3, #1 is nothing behind
> the route (i.e. aggregate route x.x.x.x <cr>) this will give you the
> next-hop of the contributing routes.  #2 reject (i.e. aggregate route
> x.x.x.x reject) this will send an ICMP message for any packet that is
> destine to your aggregate address (i.e. root at router> ping 10.200.1.0
> where
> 10.200.1.0/24 is your aggregate route).  #3 discard (i.e. aggregate route
> x.x.x.x discard) this will silently discard any route that is destine to
> the
> aggregae route (i.e. root at router> ping 10.200.1.0    where 10.200.1.0/24
> is your aggregate route).
> 
> 
> 
> On Thu, 3 Feb 2005 13:30:45 +0100
> Bostjan Fele <bostjan.fele at smart-com.si> wrote:
> 
> BF> Hi,
> BF>
> BF> aggregate routes have only two next-hop options: reject (default) or
> BF> discard. First one enables ICMP messages if there is no more specific
> route,
> BF> second one silently discards packet. This has nothing to do with
> having a
> BF> contributing route. I have not checked if passive option installes
> aggregate
> BF> route in first place if there is no contributing route or not. I would
> try
> BF> this with configuring one static route to contribute and then remove
> it.
> BF>
> BF> REgards,
> BF> Bostjan Fele
> BF>
> BF> -----Original Message-----
> BF> From: juniper-nsp-bounces at puck.nether.net
> BF> [mailto:juniper-nsp-bounces at puck.nether.net]On Behalf Of Stefan Fouant
> BF> Sent: Wednesday, February 02, 2005 4:05 PM
> BF> To: Jeroen Valcke
> BF> Cc: juniper-nsp at puck.nether.net
> BF> Subject: Re: [j-nsp] aggregates - active/passive option
> BF>
> BF>
> BF> I believe the passive option when used with aggregate / generated
> routes
> BF>   will cause the route to be continually installed in the routing and
> BF> forwarding tables, even in light of no contributing routes.  However,
> if
> BF> there are no contributing routes, the next-hop will be set to reject.
> BF>
> BF> Stefan Fouant
> BF> Senior Network Engineer
> BF> UUNET / MCI
> BF>
> BF> Jeroen Valcke wrote:
> BF> > Hello,
> BF> >
> BF> > Then when I change the active/passive parameter to passive for all
> these
> BF> > aggregate routes, they do get installed in the routing table. I find
> BF> > this to be weird since the doc says;
> BF> >
> BF> > 	passive - Have a route remain continually installed in the
> BF> > 	routing and forwarding tables even when it becomes inactive.
> BF> >
> BF> > Reading this, one would expect that the route should at least have
> been
> BF> > active before. Then how come it installs the aggregate route
> although
> BF> > the route itself has never been active?
> BF> >
> BF> > Best regards,
> BF> > -Jeroen-
> BF> _______________________________________________
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> 
> 
> --
>  Chris Hagel
> JNCIP #103
> <nanog at lordkron.net>
> 
> 
> 
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