I just updated this article:https://support.ruckuswireless.com/answers/000002296
The two Ethernet ports on a ZoneDirector are each 1gig capable, but the two Physical interfaces are one Logical
interface to the ZoneDirector.
You can connect each ZD interface to a separate network switch, but Spanning Tree should block one of the switch
port paths to prevent the ZD MAC address from being seen on it's other interface, forming a loop.
This provides High Availability for uptime purposes, in the event that a cable/interface/switch went bad or went down,
but we cannot transmit/receive traffic over both ZD interfaces simultaneously (Load Balancing / Link Aggregation).