BGP Advertise default

[opnineopnine]

Hi all.

I have a doubt I need to advertise only my default route via BGP.  I have the following configuration example
!

ip prefix-list DEFAULT permit 0.0.0.0/0
!
route-map DEFAULT permit 10
match ip address prefix-list DEFAULT
!
ip route 0.0.0.0 0.0.0.0 Null0
!
router bgp <AS>
network 0.0.0.0 mask 0.0.0.0
neighbor <CUSTOMER_PEER_IP> route-map DEFAULT out
!

Will this let me do the job, or I need to add something else?

Thanks.

[John Blakley]

There's an easier way to do this if you're just wanting to advertise their peer address as the default:

neighbor <neighbor address> default-originate

HTH,

John

[opnineopnine]

Hello John,

This is what Im looking for I have my mpls with 4 different ISP and I only want to send them my default route.

Thanks. 

[John Blakley]

Ah gotcha...okay, so the policy you have should work for that if you're wanting to control what the ISP sees...

[opnineopnine]

John

Is I use the option

ip as-path access-list 10 permit ^$

thanks.

[John Blakley]

That's going to advertise your locally advertised routes. Your first solution is better for what you were wanting to do...

To see what I mean, you can do the following on your router:

show ip bgp regex permit ^$

[opnineopnine]

Yes I know it will only advertise the local routes, the customer wants to makes this change but my question is, I only have to advertise the 172.20.230.0 255.255.255.0

ip as-path access-list 10 permit ^$ 
!
router bgp xxxxx

nei 192.168.23.2 filter-list 1 out

thanks!

[John Blakley]

I would create a prefix list to advertise it..With you as-path acl, you could be advertising more than just that...