To run the GET call in the API using Postman and save the output to the desktop to a text file called API.txt, you need to follow these steps:

Open Postman and create a new request tab. Select GET as the method from the drop-down menu.

Enter the URL of the NSX-T Policy API endpoint for retrieving the BGP routing table, such as https:// /policy/api/v1/infra/tier-0s/vmc/routing-table?enforcement_point_path=/infra/sites/default/enforcement-points/vmc-enforcementpoint

Click the Authorization tab and select Basic Auth as the type from the drop-down menu. Enter your NSX-T username and password in the Username and Password fields, such as admin and VMware1!.

Click Send to execute the request and view the response in the Body tab. You should see a JSON object with the BGP routing table information, such as routes, next hops, prefixes, etc.

Click Save Response and select Save to a file from the drop-down menu. Enter API.txt as the file name and choose Desktop as the location. Click Save to save the output to your desktop.

You have successfully run the GET call in the API using Postman and saved the output to your desktop to a text file called API.txt.