NTP server unreachable

It's not clear to me whether you want the NTP traffic to go out the mgt interface or the TMM interface. They both have separate routing tables. There are also certain scenarios where you need a non-default static route for the management interface, even with a default mgt route. So, in summary if you need the traffic to go via the mgt interface create a non-default static mgt route, if you want the traffic to go via the TMM interface make sure there is a TMM route, Brad has provided info on how to do both of these above, cheers