Hi BGP experts,
How does default-information originate advertise default route? We have lots ISPs and we are only asking those ISPs to advertise default routes to our network. We are connected to ISPs using eBGP.
One of our ISP router advertise 0.0.0.0 network to our internal network via iBGP by using default-information originate command. Actually, not only one ISP router was configured this way. All of them except one.
However, we have one ISP router also in a different site that advertises 0.0.0.0 to its iBGP peers without the default-information originate command. How did this happen?
Take note that 0.0.0.0 is always being advertised by the ISP. We don't have static routes to 0.0.0.0 configured in any of our routers.
What if I remove the default-information originate to all of the ISP routers? What will happen? Since one of our ISP router was configured this way.
Need clarification. Thanks Guys.
I am glade that you are building it up right, but please note that BGP never advertise a default route (iBGP or eBGP) unless one of the 3 actions explained above is taken.