Adding article and TOC

Author: Matias Quaranta

articles/cosmos-db/TOC.yml

@@ -533,6 +533,8 @@
       items:
       - name: Azure Cosmos DB Trigger logs
         href: how-to-configure-cosmos-db-trigger-logs.md
+        name: Azure Cosmos DB Trigger connection mode
+        href: how-to-configure-cosmos-db-trigger-connectionmode.md
       - name: Multiple Azure Cosmos DB Triggers
         href: how-to-create-multiple-cosmos-db-triggers.md
       - name: Troubleshoot Azure Cosmos DB Triggers

articles/cosmos-db/how-to-configure-cosmos-db-trigger-connectionmode.md

@@ -0,0 +1,48 @@
+---
+title: Azure Cosmos DB Trigger connection mode
+description: Learn how to configure the Azure Cosmos DB Trigger connection mode
+author: ealsur
+ms.service: cosmos-db
+ms.topic: sample
+ms.date: 06/03/2019
+ms.author: maquaran
+---
+
+# How to configure the Connection Mode used by Azure Cosmos DB Trigger
+
+This article describes how you can configure the Connection Mode used by the Azure Cosmos DB Trigger to connect to your Azure Cosmos account.
+
+## Why is the Connection Mode important?
+
+Our [performance tips](./performance-tips.md#networking) explain in detail the effect of the different Connection Modes. By default, **Gateway** is used to establish all connections on the Azure Cosmos DB Trigger. It might not be the best option for performance-driven scenarios.
+
+## Changing the Connection Mode and Protocol
+
+To change the default Connection Mode and Protocol used by the Azure Cosmos DB Trigger (and all the [Azure Cosmos DB bindings](./functions-bindings-cosmosdb-v2.md#output)), you need to locate the `host.json` file in your Azure Functions project or Azure Functions App and manually add the following [extra setting](./functions-bindings-cosmosdb-v2.md#hostjson-settings):
+
+```js
+{
+  "cosmosDB": {
+    "connectionMode": "Direct",
+    "protocol": "Tcp"
+  }
+}
+```
+
+Where `connectionMode` must have the desired Connection Mode (Direct or Gateway) and `protocol` the desired Connection Protocol (Tcp or Https). 
+
+If your Azure Functions project is working with Azure Functions V1 runtime, the configuration has a slight name difference:
+
+```js
+{
+  "documentDB": {
+    "connectionMode": "Direct",
+    "protocol": "Tcp"
+  }
+}
+```
+
+## Next steps
+
+* [Connection limits in Azure Functions](../azure-functions/manage-connections.md#connection-limit)
+* [Azure Cosmos DB performance tips](./performance-tips.md)