A standalone tier-1 logical router has no downlink and no connection to a tier-0 router. It has a service router but no distributed router. The service router can be deployed on one NSX Edge node or two NSX Edge nodes in active-standby mode.

A standalone tier-1 logical router:
  • Must not have a connection to a tier-0 logical router.
  • Must not have a downlink.
  • Can have only one centralized service port (CSP) if it is used to attach a load balancer (LB) service.
  • Can connect to an overlay logical switch or a VLAN logical switch.
  • Supports the load balancing and NAT services only.

Typically, a standalone tier-1 logical router is connected to a logical switch that a regular tier-1 logical router is also connected to. The standalone tier-1 logical router can communicate with other devices through the regular tier-1 logical router after static routes and route advertisements are configured.


  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 Add and select Tier-1 Router.
  4. Enter a name for the logical router and optionally a description.
  5. (Required) Select an NSX Edge cluster to connect to this tier-1 logical router.
  6. (Required) Select a failover mode and cluster members.
    Option Description
    Preemptive If the preferred node fails and recovers, it will preempt its peer and become the active node. The peer will change its state to standby. This is the default option.
    Non-preemptive If the preferred node fails and recovers, it will check if its peer is the active node. If so, the preferred node will not preempt its peer and will be the standby node.
  7. Click Add.
  8. Click the name of the router that you just created.
  9. Click the Configuration tab and select Router Ports.
  10. Click Add.
  11. Enter a name for the router port and optionally a description.
  12. In the Type field, select Centralized.
  13. For URPF Mode, select Strict or None.
    URPF (Unicast Reverse Path Forwarding) is a security feature.
  14. (Required) Select a logical switch.
  15. Select whether this attachment creates a switch port or updates an existing switch port.
  16. Enter the router port IP address in CIDR notation.
  17. Click Add.


Before using the standalone tier-1 logical router, note the following:
  • To specify the default gateway for the standalone tier-1 logical router, you must add a static route. The subnet should be and the next hop is the IP address of a regular tier-1 router connected to the same switch.
  • ARP proxy on the standalone router is not supported. Therefore, you must not configure an LB virtual server IP or LB SNAT IP in the CSP's subnet unless you use the CSP IP. For example, if the CSP IP is, the virtual IP must be either or some other subnet IP addresses. It cannot be any other address in the subnet.
  • For an NSX Edge VM, you cannot have more than one CSPs which are connected to the same VLAN-backed logical switch or different VLAN-backed logical switches that have the same VLAN ID.