Re: BGP default route

Sorry the config was pasted and is incorrect, it should have been:

router bgp 111
 neighbor 1.1.1.1 remote-as 111
 neighbor 1.1.1.1 upd lo0
 neighbor 1.1.1.1 default-originate route-map check-default
!
ip route 0.0.0.0 0.0.0.0 Null0
!
ip prefix-list default-route seq 5 permit 0.0.0.0/0
!
route-map Check-Default permit 10
 match ip address prefix-list default-route

On Wed, May 4, 2011 at 10:08 PM, Steve Di Bias <sdibias_at_gmail.com> wrote:

>
> To add default routes to BGP we can inject them by:
>
> 1) using the network command
> 2) using the redistribute command
> 3) using the neighbor default-information-originate command
>
> When injecting a 0/0 route into BGP using the network command, a route to
> 0.0.0.0/0 must already exist in the routing table and the "network
> 0.0.0.0" command is required
>
> Injecting a default route through route redistribution requires the
> "default-information-orginate" Just as before the default (0/0) route must
> already exist in the routing table.
>
> By using the "neighbor 1.1.1.1 default-information-originate" we will not
> add a default route to our local table, instead we are advertsing a default
> route to our neighbor at 1.1.1.1
>
> With this method the router doesn't care about the existince of a default
> route (in other words, the 0/0 route doesn't need to exist in our IP routing
> table) You could also setup conditional default routing by using a route-map
> too! So as long as a route-map permit clause is matched, the default route
> will be advertised to our neighbor at 1.1.1.1
>
> This can be accomplished by using the "route-map check-default" Here is a
> sample configuration:
>
> router bgp 111
> neighbor 1.1.1.1 remote-as 111
> neighbor 1.1.1.1 update-source loop 0
> neighbor 1.1.1.1 default-originate route-map check-default
> !
> ip route 0.0.0.0 0.0.0.0 Null0
> !
> ip prefix-list def_route seq 5 permit 0.0.0.0/0
> !
> route-map CHK_DEF permit 10
> match ip address prefix-list def_route
>
> HTH
>
> On Wed, May 4, 2011 at 7:54 PM, emir d souza <emir979_at_gmail.com> wrote:
>
>> Hi Guys,
>>
>> I'm trying to nail down what is actually required to advertise a default
>> route in BGP and in how many ways in can be done?
>>
>> Any advice anyone?
>>
>> Cheers!
>>
>>
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>>
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>
>
> --
> -Steve Di Bias
>

-- 
-Steve Di Bias
Blogs and organic groups at http://www.ccie.net