I did some more troubleshooting.. Trying to convince myself that this is a routing issue, but not sure.
I have setup out-of-band management for the management port on the EX2300. It is assigned an IP of 192.168.99.30 and is connected to one of Vlan 99 management ports on the EX3300. That is working fine.
I connected to the console port on the EX2300 via a serial connection. As long as I have management cable connected on the EX2300, I can ping all the RVIs on the EX3300. When I disconnect the management cable and ping the RVIs on the EX3300, I get a message "No route to host" message.
So do I have a routing issue or an issue with the link aggregation interfaces?
FYI.. The static route on the EX2300 is 0.0.0.0/0 -> Next Hop 192.168.99.1