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I ran into this UI bug the other day when I was trying to enable route
redistribution on an Edge in a Secondary site of a cross-vCenter NSX deployment.
The Edge itself was deployed correctly, and configured to peer with a physical
northbound router, however when I attempted to configure the route
redistribution I was unable to do so.
Fortunately, the solution was simple - use the API.
Perform a GET operation to retrieve the current BGP configuration
Copy and modify the BGP section to include the redistribution settings you