The workload VMs on the NSX-V bridged Logical Switch are currently using the Distributed Logical Router (DLR) as their default gateway for all the north-south traffic.
- Switch the default gateway to NSX. In other words, the migrated VMs must connect to the tier-1 gateway as their default gateway for all north-south traffic. If your NSX environment has a single tier routing topology, you can switch to the tier-0 gateway.
- If you have pre-configured Layer 3 network services on the tier-1 or tier-0 gateway, and dynamic route peering between tier-0 gateway and north-facing physical routers, do the following configurations:
- On the tier-1 gateway, turn on Route Advertisement and Layer 3 services.
- On the tier-0 gateway, turn on Route Re-distribution Status.
When the bridged overlay segment is connected to the NSX gateway, a GARP (gratuitous ARP) message will be sent and all connected VMs (including the NSX-V VMs) can update their ARP table accordingly.
You can make these configurations changes either manually or automate them by running APIs in a script file. Automation can help you to minimize the data traffic outage.
The following procedure explains the manual method of switching the default gateway to the tier-1 or tier-0 gateway in NSX by using the UI when Layer 3 services are not configured. For a minimum data traffic outage, you can automate the switching process with APIs.
Prerequisites
Procedure
- In the NSX-V environment, disconnect the bridged Logical Switch from the DLR.
- In the vSphere Client, navigate to the NSX Edge (DLR).
- Click .
- Select the internal interface on the DLR that is connected to the bridged Logical Switch and click Disconnect.
- In the NSX environment, connect the bridged overlay segment to the tier-1 gateway.
- In NSX Manager, navigate to .
- Next to the name of the bridged overlay segment, click the vertical ellipses, and then click Edit.
- Turn on the Connectivity of the overlay segment, and click Save.
