14. AWS (BGP) WAN (OSPF/BGP) CORE (OSPF) BACKBONE (OSPF / 0.0.0.0) WAN (OSPF/BGP)

15. What to advertise to the VPC?What to advertise to the VPC? The notorious asymmetric routing problems.The notorious asymmetric routing problems. Two flavors, one below.Two flavors, one below. Somewhere you have to NAT or ELB.Somewhere you have to NAT or ELB. TIP: Routing policy on campus MUST compliment AWS.TIP: Routing policy on campus MUST compliment AWS. Advertise RFC1918 + Routable ------  ------  Receive RFC1918 + Routable <-------- <-------- Client Request From Routable Need ELBNeed ELB Reply to client.

16. Routing DesignRouting Design Tethering To CampusTethering To Campus Core VPC & DMZ VPCCore VPC & DMZ VPC Campus Services AD LDAP AWS VPC Internet Campus Services AD LDAP AWS Core Campus Services AD LDAP (replication) Internet AWS DMZ VPC VPC PeeringVPC Peering No transit to campus.No transit to campus. VPN / DCVPN / DC