Controlling Outbound Traffic Flow
We've discussed controlling inbound traffic flow while discussing peering with a single service provider or multiple service providers, since controlling inbound traffic flow is strongly tied with your peers' BGP and route aggregation policies. Outbound traffic flow control, however, is quite a bit simpler, since IP routing protocols are designed to control the adjacent next hop toward any given destination, and controlling the next hop taken toward any given destination also controls the exit path the traffic takes.
Controlling Outbound Traffic Flow Using Interior Gateway Protocols
Several methods can be used to control outbound traffic flow using the interior gateway protocol—such as EIGRP, IS-IS, and OSPF—you ...