So after doing a lab test between a Ex and QFX using a traffic genarator we noted that traffic flow went over one member interface and returned over the other.
We did the same test but the result looks defrent on the MX routers. Seems like the traffic transmit and recieve over the same link. This is now with default AE configuration on both scenarios. So my question then is do the MX by default do symetric laodbalcing where as the switches needs to be configured. It would be nice if this is actaully documented or perhaps it is just a coincidence that the traffic flow seemed this way perhaps not enough sessions generated etc. Do anyone know the facts or done something similar as it quite import for a soltuion i am working on.