Solution :
Considering the following data :
provides the national backbone to the regional
.
provides the national backbone to the regional
.
Each of the ISP consists of one autonomous systems (AS).
would like to hand over the traffic of C through the
Coast.
The would like to receive traffic from B's peering point via East Coast.
One way for to force
to hand over all of
’s traffic to
on the east coast is for
to only advertise its route to
via its east coast peering point with
.