Definition: Azure automatically creates a route table for each subnet within an Azure virtual network and adds system default routes to the table. To learn more about virtual networks and subnets, see Virtual network overview. You can override some of Azure's system routes with custom routes, and add more custom routes to route tables. Azure routes outbound traffic from a subnet based on the routes in a subnet's route table. Source: Microsoft Source reference: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview Example: The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): The following implementation is an example on how this specific Architecture Building Block (ABB) can be instantiated as a Solution Building Block (SBB): Turris Omnia Open Source Router, https://opensource.com/article/22/1/turris-omnia-open-source-router eira:iopDimension: Structural IoP LOST view: TVI-Networking Infrastructure Enablers [Traceability] eira:iopSaliency: Router ABB is salient for technical interoperability due to it physically establishes the rules for distributing the information into a network. Identifier: http://data.europa.eu/dr8/AzureRouteTableTechnologyService eira:ID: http://data.europa.eu/dr8/AzureRouteTableTechnologyService ABB name: eira:RouterTechnologyService EIRA concept: eira:SolutionBuildingBlock