BGP Question from Ciscopress book

happy420golucky

Hello everybody, I am sitting here reading my Cisco press book and had a question that just could not be answered.

So if anyone has "CCNP-BSCI 642-901" please look at page 403 -Receiving routing information from the internet.

In this portion of BGP they talk about accepting only default routes from all providers. In my mind I am thinking one of my ISP's router has a route= Example 0.0.0. 0.0.0.0 fa0/1 or 22.6.21.1 to my network. Am I thinking this correctly? It really doesn't make sense to me why an ISP would do that. I would think that it would use its default route out to say an ATM node or whatever their higher level tier would be.

Just to clarify this, I do understand the purpose of providing a deafault route towards an ISP, just a bit confused on how and ISP configures their routes towards me.

Thanks for your response and input ahead of time

networker050184

The ISP doesn't use a default route towards your network. You would set a default route to the ISP (or they would advertise it to you). The ISP would have a route back to your specific address or addresses.

I think you are confused by the way it is worded.

happy420golucky

networker050184 wrote:

The ISP doesn't use a default route towards your network. You would set a default route to the ISP (or they would advertise it to you). The ISP would have a route back to your specific address or addresses.

I think you are confused by the way it is worded.

Yeah I was confused. I was just wondering how the ISP would be set up. I also found this link for anyone else reading this post.

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a008009456d.shtml#defaultroutes

this really helped me get the whole picture down in my head.