You can configure forwarding up timer for a tier-0 logical router.
Forwarding up timer defines the time in seconds that the router must wait before sending the up notification after the first BGP session is established. This timer (previously known as forwarding delay) minimizes downtime in case of fail-overs for active-active or active-standby configurations of logical routers on NSX Edge that use dynamic routing (BGP). It should be set to the number of seconds an external router (TOR) takes to advertise all the routes to this router after the first BGP/BFD session. The timer value should be directly proportional to the number of northbound dynamic routes that the router must learn. This timer should be set to 0 on single edge node setups.
- From your browser, log in to an NSX Manager at https://nsx-manager-ip-address.
- Select Routing from the navigation panel.
- Select the tier-0 logical router.
- Click Edit.
- Enter a value for the forwarding up timer.
- Click Save.