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 Data Center creates NSX-T Data Center 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.
- From your browser, log in with admin privileges to an NSX Manager at https://nsx-manager-ip-address.
- Select from the navigation panel.
- Click the name of a tier-1 router.
- Select Route Advertisement from the Routing drop-down menu.
- Click Edit to edit the route advertisement configuration.
You can toggle the following switches:
- Advertise All NSX Connected Routes
- Advertise All NAT Routes
- Advertise All Static Routes
- Advertise All LB VIP Routes
- Advertise All LB SNAT IP Routes
- Click Save.
- Click Add to advertise routes.
- Enter a name and optionally a description.
- Enter a route prefix in CIDR format.
- Click Apply Filter to set the following options:
Action Specify Allow or Deny. Match route types Select one or more of the following:
- NSX Connected
- Tier-1 LB VIP
- Tier-1 NAT
- Tier-1 LB SNAT
Prefix operator Select GE or EQ.
- Click Add.
What to do next
Familiarize yourself with the tier-0 logical router topology and create the tier-0 logical router. See 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.