R1 has an EBGP peer to R5 and an IBGP peer to R2.
R2 has an EBGP peer to R4 and IBGP peer to R1.
Ensure that the 15 loopbacks on R1 (188.8.131.52–184.108.40.206/24) are advertised to R5 and that R5 modifies all even networks with a local weight to 1000 and metric (MED) to 100. For all odd networks, set the weight to 2000 and the metric (MED) to 200.
Ensure that R1 advertises a default route to R5 and that R2 advertises a default route to R4. Use a prefix list to accomplish this task.
Ensure that R4 does not accept any networks in the range 220.127.116.11 but does accept a default route only. All other networks must be denied on R4.
Ensure that R3 can reach all BGP-advertised networks using OSPF as the only routing protocol. (That is, redistribution is required on R1/R2).