To provide Layer 3 connectivity between VMs connected to logical switches that are attached to different tier-1 logical routers, it is necessary to enable tier-1 route advertisement towards tier-0. You do not need to configure a routing protocol or static routes between tier-1 and tier-0 logical routers. NSX-T creates NSX-T static routes automatically when you enable route advertisement.
For example, to provide connectivity to and from the VMs through other peer routers, the tier-1 logical router must have route advertisement configured for connected routes. If you don't want to advertise all connected routes, you can specify which routes to advertise.
Verify that VMs are attached to logical switches. See Creating Logical Switches and Configuring VM Attachment.
Verify that downlink ports for the tier-1 logical router are configured. See Add Downlink Ports for the Tier-1 Logical Router.
- From your browser, log in to an NSX Manager at https://nsx-manager-ip-address.
- Select Routing.
- Click a tier-1 logical router.
- Select Route Advertisement from the Routing drop-down menu.
- Enable route advertisement by clicking Edit and making sure the Status button is Enabled.
- Specify which routes to advertise, either all routes or selected routes.
Click Edit and select Advertise All NSX Connected Routes.
Click Add and enter information about the routes to be advertised. For each route, you can enter a name and a route prefix in CIDR format.
- Click the Status toggle button to enable Route Advertisement.
- Click Save.
What to do next
Familiarize yourself with the tier-0 logical router topology and create the tier-0 logical router. See Configuring a Tier-0 Logical Router.
If you already have a tier-0 logical router connected to the tier-1 logical router, you can verify that the tier-0 router is learning the tier-1 router connected routes. See Verify that a Tier-0 Router Has Learned Routes from a Tier-1 Router.