# SAP on Amazon High Availability with Overlay IP Address Routing
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This guide provides SAP customers and partners instructions to set up a highly available SAP architecture that uses overlay IP addresses on Amazon Web Services. This guide includes two configuration approaches:
+  Amazon Transit Gateway serves as central hub to facilitate network connection to an overlay IP address.
+ Elastic Load Balancing where a Network Load Balancer enables network access to an overlay IP address.

This guide is intended for users who have previous experience installing and operating highly available SAP environments and systems.

**Topics**
+ [SAP on Amazon High Availability Setup](sap-oip-sap-on-aws-high-availability-setup.md)
+ [Overlay IP Routing using Amazon Transit Gateway](sap-oip-overlay-ip-routing-using-aws-transit-gateway.md)
+ [Overlay IP Routing with Network Load Balancer](sap-oip-overlay-ip-routing-with-network-load-balancer.md)