BGP-4, exercise 3, Multihomed
Connect ISP-A and ISP-B to the US.
ISP-A and ISP-B become multihomed. Check the BGP routing tables. Any changes?
Break the link between ISP-A and EU and ISP-B and EU. Do you still have connectivity to EU (or does EU have connectivity to ISP-A and ISP-B)? Why (not)? If not, solve the problem.