You can advertise your all internal routes to ISP, so that outside world can reach to your internal servers ,that is for reverse traffic. But to reach internet you just need a default route. You can contact your ISP with this requirement, they will help you out.
It may be helpful to remember that in BGP learning routes from a neighbor and advertising routes to the neighbor are separate operations and are controlled independently. As Akash has explained you can configure a route map or a distribute list to control what routes you learn from your neighbor and have no effect of what you advertise. Appropriate network statements or redistribute statements allow you to advertise routes to your neighbor and have no effect on what you learn from the neighbor.
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Also depending on you setup with your ISP, you might not need BGP at all. Sometimes the ISP will advertize your public IP space (i.e. you don't need to), and if they do, all you need is a default route out.
Also BTW, often for basic ISP connectivity, even when BGP peering with your ISP, the ISP will not send you any routes but a default (because with a single link, there's no need for them).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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