-- **Virtual network gateway**: One or more routes with *Virtual network gateway* listed as the next hop type are added when a virtual network gateway is added to a virtual network. The source is also *virtual network gateway*, because the gateway adds the routes to the subnet. If your on-premises network gateway exchanges border gateway protocol ([BGP](#border-gateway-protocol) routes with an Azure virtual network gateway, a route is added for each route propagated from the on-premises network gateway. It's recommended that you summarize on-premises routes to the largest address ranges possible, so the fewest number of routes are propagated to an Azure virtual network gateway. There are limits to the number of routes you can propagate to an Azure virtual network gateway. For details, see [Azure limits](../azure-subscription-service-limits.md?toc=%2fazure%2fvirtual-network%2ftoc.json#networking-limits).
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