NSX Data Center for vSphere provides multiple tools for making sure that routing is working. NSX Routing CLIThere is a collection of CLI commands that allow an operator to examine the running state of various parts of the NSX routing subsystem. Brief Recap of RoutingTo effectively troubleshoot routing issues, it is helpful to review how routing works and the related information tables. Verifying the DLR State Using a Sample Routed TopologyThis section discusses how to verify the information that the DLR requires to route packets. DLR and Its Related Host Components VisualizedThe following diagram shows two hosts, ESXi Host A and ESXi Host B, where our example “DLR Instance A” is configured and connected to the four VXLAN LIFs. Distributed Routing Subsystem ArchitectureDLR instances on ESXi hosts have access to all information needed to perform L3 routing. NSX Routing Subsystem ComponentsThe NSX routing subsystem is enabled by multiple components. NSX Routing Control Plane CLIIn addition to the host components, NSX Routing employs services of the Controller Cluster and DLR Control VMs, each of which is a source of the DLR control plane information and has its own CLI used to examine it. NSX Routing Subsystem Failure Modes and EffectsThis chapter reviews the typical failure scenarios that might affect components of NSX routing subsystem and outlines the effects of these failures. NSX Logs Relevant to RoutingThe best practice is to configure all components of NSX to send their logs to a centralized collector, where they can be examined in one place. Common Failure Scenarios and FixesThe most common failure scenarios fall into two categories. Gathering Troubleshooting DataThis section provides a summary of the CLI commands that are commonly used for troubleshooting NSX routing. Parent topic: Troubleshooting NSX Routing
