From: Huan Pham (pnhuan@yahoo.com)
Date: Fri Aug 29 2008 - 03:53:48 ART
Agree with Joseph,
Just wants to highlight that by default when you do redistribution from IGP or Static to BGP, the default route does not get redistributed. Hence you need the "default-information originate" under BGP.
The Command Reference explains this VERY CLEARLY.
Here's usage guidelines from Command Reference.
The default-information originate command is used to configure a BGP routing process to advertise a default route (network 0.0.0.0). A redistribution statement must also be configured to complete this configuration or the default route will not be advertised.
The configuration of the default-information originate command in BGP is similar to the configuration of the network (BGP) command. The default-information originate command, however, requires explicit redistribution of the route 0.0.0.0. The network command requires only that the route 0.0.0.0 is present in the Interior Gateway Protocol (IGP) routing table. For this reason, the network command is preferred.
--- On Fri, 8/29/08, Joseph Brunner <joe@affirmedsystems.com> wrote:
> From: Joseph Brunner <joe@affirmedsystems.com>
> Subject: RE: BGP Default-information originate
> To: "'Mark Stephanus Chandra'" <mark.chandra@gmail.com>, "'Cisco certification'" <ccielab@groupstudy.com>
> Date: Friday, August 29, 2008, 4:46 PM
> Don't confuse this command with the "neighbor
> x.x.x.x default-originate"
> command.
>
> This "default-information originate" command per
> the doc cd
> "the default-information originate command requires an
> explicit
> redistribution of the route 0.0.0.0"
>
> With this example...
>
> The following router configuration mode example configures
> BGP to
> redistribute OSPF into BGP:
>
> router bgp 164
>
> default-information originate
>
> redistribute ospf 109
>
>
> then we have the "neighbor x.x.x.x default-information
> originate" command...
>
> and per the doc cd (and my own using it in prod) "This
> command does not
> require the presence of 0.0.0.0 in the local router".
>
> Get good at using the doc cd for your answers...
>
> Just like a refrigerator full of red bull and grey goose,
> its "tough to go
> all night and not stop" without a willing drunk milf
> or a fully
> Reference-able guide...
>
> -J
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
> On Behalf Of Mark
> Stephanus Chandra
> Sent: Friday, August 29, 2008 2:21 AM
> To: 'Cisco certification'
> Subject: BGP Default-information originate
>
> Guys,
>
>
>
> Need more Help.
>
>
>
> Questioning about command default-information originate in
> BGP
>
> I have search all my e-book, bgp book, no good explanation
> about
> default-information originate in bgp configuration.
>
>
>
> For exmaple if I have command like this :
>
>
>
> Router bgp 200
>
> default-information originate
>
>
>
> When I insert this command into my BGP process, it
> doesn't effect anything.
> My neighbor don't receive any default.
>
>
>
> So I am thingking maybe it's like ospf
> default-information originate, when
> your router doesn't have a default route, it's not
> gonna advertise a default
> route to it's neighbor.
>
>
>
> So I guess I insert a static default-route but nothing
> happens either.
>
>
>
> Could anyone give me explanation when this command take
> effect
>
>
>
> Thanks Guys, really appreciate your help
>
>
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
>
>
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