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articles/virtual-machines/workloads/sap/hana-connect-vnet-express-route.md

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> [!NOTE]
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> The last parameter in the command New-AzVirtualNetworkGatewayConnection, **ExpressRouteGatewayBypass** is a new parameter that enables ExpressRoute Fast Path. A functionality that reduces network latency between your HANA Large Instance units and Azure VMs. The functionality got added in May 2019. For more details, check the article [SAP HANA (Large Instances) network architecture](https://docs.microsoft.com/en-us/azure/virtual-machines/workloads/sap/hana-network-architecture). Make sure that you are running the latest version of PowerShell cmdlets before running the commands.
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> The last parameter in the command New-AzVirtualNetworkGatewayConnection, **ExpressRouteGatewayBypass** is a new parameter that enables ExpressRoute Fast Path. A functionality that reduces network latency between your HANA Large Instance units and Azure VMs. The functionality got added in May 2019. For more details, check the article [SAP HANA (Large Instances) network architecture](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/hana-network-architecture). Make sure that you are running the latest version of PowerShell cmdlets before running the commands.
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To connect the gateway to more than one ExpressRoute circuit associated with your subscription, you might need to run this step more than once. For example, you're likely going to connect the same virtual network gateway to the ExpressRoute circuit that connects the virtual network to your on-premises network.
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articles/virtual-machines/workloads/sap/hana-network-architecture.md

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To lower the latency, ExpressRoute Fast Path got introduced and released in May 2019 for the specific connectivity of HANA Large Instances to Azure virtual networks that host the SAP application VMs. The major difference to the solution rolled out so far, is, that the data flows between VMs and HANA Large Instances are not routed through the ExpressRoute gateway anymore. Instead the VMs assigned in the subnet(s) of the Azure virtual network are directly communicating with the dedicated enterprise edge router.
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> [!IMPORTANT]
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> The ExpressRoute Fast Path functionality requires that the subnets running the SAP application VMs are in the same Azure virtual network that got connected to the HANA Large Instances. VMs located in Azure virtual networks that are peered with the Azure virtual network connected directly to the HANA Large Instance units are not benefiting from ExpressRoute Fast Path. As a result typical hub and spoke virtual network designs, where the ExpressRoute circuits are connecting against a hub virtual network and virtual networks containing the SAP application layer (spokes) are getting peered, the optimization by ExpressRoute Fast Path will not work. In addtion, ExpressRoute Fast Path does not support user defined routing rules (UDR) today. For more information, see [ExpressRoute virtual network gateway and FastPath](https://docs.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways).
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> The ExpressRoute Fast Path functionality requires that the subnets running the SAP application VMs are in the same Azure virtual network that got connected to the HANA Large Instances. VMs located in Azure virtual networks that are peered with the Azure virtual network connected directly to the HANA Large Instance units are not benefiting from ExpressRoute Fast Path. As a result typical hub and spoke virtual network designs, where the ExpressRoute circuits are connecting against a hub virtual network and virtual networks containing the SAP application layer (spokes) are getting peered, the optimization by ExpressRoute Fast Path will not work. In addtion, ExpressRoute Fast Path does not support user defined routing rules (UDR) today. For more information, see [ExpressRoute virtual network gateway and FastPath](https://docs.microsoft.com/azure/expressroute/expressroute-about-virtual-network-gateways).
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For more details on how to configure ExpressRoute Fast Path, read the document [Connect a virtual network to HANA large instances](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/hana-connect-vnet-express-route).
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> [!IMPORTANT]
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> The data flow and control flow of the network traffic between the different HANA Large instance tenants will not be routed through azure networks. As a result you can't use Azure functionality or NVAs to enforce communication restrictions between your two HANA Large Instances tenants.
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For more details on how to get ExpressRoute Global Reach enabled, read the document [Connect a virtual network to HANA large instances](https://docs.microsoft.com/en-us/azure/virtual-machines/workloads/sap/hana-connect-vnet-express-route).
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For more details on how to get ExpressRoute Global Reach enabled, read the document [Connect a virtual network to HANA large instances](https://docs.microsoft.com/azure/virtual-machines/workloads/sap/hana-connect-vnet-express-route).
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## Internet connectivity of HANA Large Instance

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