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.

Prerequisites

Procedure

  1. From your browser, log in with admin privileges to an NSX Manager at https://nsx-manager-ip-address.
  2. Select Networking > Routing from the navigation panel.
  3. Click the name of a tier-1 router.
  4. Select Route Advertisement from the Routing drop-down menu.
  5. Click Edit to edit the route advertisement configuration.

    You can toggle the following switches:

    • Status

    • Advertise All NSX Connected Routes

    • Advertise All NAT Routes

    • Advertise All Static Routes

    • Advertise All LB VIP Routes

    • Advertise All LB SNAT IP Routes

    1. Click Save.
  6. Click Add to advertise routes.
    1. Enter a name and optionally a description.
    2. Enter a route prefix in CIDR format.
    3. Click Apply Filter to set the following options:

      Action

      Specify Allow or Deny.

      Match route types

      Select one or more of the following:

      • Any

      • NSX Connected

      • Tier-1 LB VIP

      • Static

      • Tier-1 NAT

      • Tier-1 LB SNAT

      Prefix operator

      Select GE or EQ.

    4. 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.