From: Josef A (josefnet@gmail.com)
Date: Wed Dec 13 2006 - 20:48:12 ART
Shamin,
The text is probably explaining two of the methods you can use to generate a
default route (0.0.0.0) in bgp.
A default route can be generated in bgp if a default route is present in the
route table (via IGP or static route) in two ways:
1) use a network 0.0.0.0 statement
OR
2) redistibute igp (dynamic or static) + default-information originate
statement. Note that with this second method, bgp will not originate the
default route if the default-information originate statement is not
configured.
A third method of generating a default route in bgp is to use the neighbor
default-originate /route-map command.
HTH
Josef
On 12/13/06, Shamin <ccie.xpert@gmail.com> wrote:
>
> Hi all.
>
> The explanation on Cisco web site for default-information originate under
> BGP is as follows:
>
> 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.
>
>
> I did not understand why the redistribution statement is required & the
> explanation about the network statement.
>
> Your valuable inputs will be appreciated.
>
> Regards
> Shamin
>
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