NSX-T – Configuring OSPF Routing

Starting with NSX-T Data Center 3.1.1, you can configure OSPF routing on a tier-0 gateway.

NSX-T supports interfaces running OSPF as broadcast or numbered point-to-point. We will be configuring OSPF with Point-To-Point interfaces.

The diagram below shows the high-level configuration for the Lab:

I am using a pair of virtual machines running FRRouting as the routers for the Lab.

FRR-01 Configuration

  • VLAN 100 and VLAN 110 will be used as OSPF Interfaces
  • OSPF configured with Area 0 and advertising a default route.

FRR-02 Configuration

  • VLAN 120 and VLAN 130 will be used as OSPF Interfaces
  • OSPF configured with Area 0 and advertising a default route.

NSX-T Configuration

  1. Create VLAN segments that will be used for the uplinks between the T0 and the FRR routers for VLAN 100, 110, 120 and 130:

  1. Create Interfaces on the T0 Gateway. Interfaces on VLAN 100 and VLAN 120 will be on Edge Node 1 and interfaces on VLAN 110 and VLAN 130 will be on Edge Node 2(ensure that the MTU values match between neighbors):

  1. Open the OSPF tab. Enable OSPF, enable ECMP and define an area ID (Area 0 in the lab):

  1. Configure OSPF Interfaces. Select the uplink interface, Area ID, Network Type, BFD is enabled on the FRR routers, so we will enable it as well:

  1. Verify that the OSPF configuration is correct and that the T0 Gateway has formed adjacencies with both FRR Routers:

  1. Enable and Set OSPF Route Re-Distribution:

  1. Verify that the overlay routes are being advertised:




Thanks for reading.

Ryandran Naidoo
Ryandran Naidoo
VMware Consulting Architect

Consulting Architect with VMware Professional Services