Allied Telesis AT-S63 - Manual (Page 334)

Chapter 29: Internet Protocol Version 4 Packet Routing
334 Section VII: Routing
Default Routes
A default route is a “match all” destination entry in the routing table. The
switch uses it to route packets whose remote destinations are not in the
routing table. Rather than discard the packets, the switch sends them to
the next hop specified in the default route.
A default route has a destination IP address of 0.0.0.0 and no subnet
mask. A default route can be enter manually in the form of a static route or
learned dynamically through RIP. A switch can have multiple default
routes.