Change the MAC Address of NSX-T Virtual Distributed Router

You must change the default MAC address of the NSX-T virtual distributed router so that it does not use the same MAC address that is used by the Distributed Logical Router (DLR) of NSX-v.

The virtual distributed routers (VDR) in all the transport nodes of an NSX-T environment use the default global MAC address. You can change the global MAC address of the NSX-T VDR by updating the global gateway configuration with the following PUT API:

PUT https://{policy-manager}/policy/api/v1/infra/global-config

For a detailed explanation about all the parameters in this global gateway configuration API, see the NSX-T Data Center API Guide.

Caution: While changing the MAC address of NSX-T Virtual Distributed Router, if a VM is attached to an NSX-T overlay segment, you might observe a short disruption in the data plane.

The default global MAC address is: 02:50:56:56:44:52. For example, you want to change it to 02:50:56:56:44:62.

Procedure

1. Retrieve the output of the global gateway configuration API by running the following GET API:
   GET https://{policy-manager}/policy/api/v1/infra/global-config
2. Copy and paste the GET API response in a text editor.
3. Edit the following two parameter values:
   • vdr_mac: 02:50:56:56:44:62
   • allow_changing_vdr_mac_in_use: true

   Retain the existing values of the other parameters.

4. Copy and paste the complete edited API response in the request body of the following PUT API:
   PUT https://{policy-manager}/policy/api/v1/infra/global-config
5. Run the PUT API to change the default global MAC address of the NSX-T VDR.