When your network is the destination and there are two entry points into your network that are determined via BGP, the first thing you should know is that the final say for any incoming traffic as to which link will be used, is that of the ISP(s). You can attempt to influence routing towards your network that is routed via BGP, but you cannot obligate its behaviour. If the ISPs choose to ignore your “influence” they can.
From an administration point of view, if both links are from the same ISP, then you can talk to them and devise a way to get the traffic more evenly distributed. If they’re not from the same ISP, then it is much more difficult. You will have to resort to trying to influence traffic.
There are several ways to influence inbound traffic, but keep the following key points in mind:
**You do not have ultimate control of how traffic enters your AS. Your ISPs may have outbound policies that will override all of your attempts to influence inbound traffic**
Methods that can be used to influence traffic include:
* Leaking more specific routes
* AS-PATH Prepending
* Community/Local Pref agreement.
I hope this has been helpful!