From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri May 04 2007 - 13:42:51 ART
RIP will generate a default route with the "default-information originate"
command even if it has non in its routing table.
The route-map can be used for conditional advertisement of the default
route, the route-map references an access-list, and the access-list can
reference a route that exists in its routing table.
The combination of route-map and the default-information originate tells the
router to inject a default route if the condition of the route-map is true,
which means that if the network that the access-list is referencing is
actually up and its in the routing table, then the router will originate a
default route.
On 5/4/07, Gregory Gombas <ggombas@gmail.com> wrote:
>
> Hello,
>
> Can someone please elaborate on why the route map was added to the
> default-information originate commands? What is the function of it?
>
> Thanks
>
> On 5/4/07, Todd, Douglas M. <DTODD@partners.org> wrote:
> > Kim:
> > my 2bits:
> >
> > Having been running the gamut on RIP over the last week or so, Rip will
> generate
> > a default route when one is not present in the RIB. However,
> auto-summarization
> > must be enabled (at least this is what I have found to be the case) in
> order for
> > the default route to be generated.
> >
> > So far what the doc states is true, but it does not mention the need for
> > auto-summarization to generate the default route. If someone has that
> url I'd
> > love to see it..
> >
> > I am sure you have come across this but:
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hirp_c/ch2
> > 5/ripconfg.htm
> > is a good reference.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com on behalf of Bob Sinclair
> > Sent: Wed 5/2/2007 8:43 PM
> > To: Istvan Szabo (isszabo)
> > Cc: Kim; ccielab@groupstudy.com
> > Subject: Re: RIP - Default Information Originate
> >
> > Istvan Szabo (isszabo) wrote:
> > > Hi Kim and all,
> > >
> > > RIP only injects a default route using default information originate,
> if
> > > it is in the routing table AND is learnt by RIP.
> > >
> > > This means if the default route is present, but is static or learnt by
> > > other protocol, you have to use redistribute.
> > >
> > Istvan,
> >
> > I really hate to contradict, because I am sure you have a good reason
> > for saying this, but it is not the behavior I see in recent IOS.
> >
> > I am running (C3640-JK9O3S-M), Version 12.4(5) and RIP has no problem
> > generating a default all on its own using default-information originate.
> >
> > For me, it generates a default even without there being one in the table
> > at all. And we have seen this behavior week in and week out in our
> > class for years.
> >
> > By the way, the use of default-inf orig under RIP does not generate a
> > local route to null 0.
> >
> > Hope we can figure out the discrepancy! :-)
> > --
> > Hth,
> >
> > Bob Sinclair CCIE 10427 CCSI 30427
> > www.netmasterclass.net
> >
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 Network Learning, Inc. (CCIE class Instructor) www.ccbootcamp.com (CCIE Training)
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