Allied Telesis AT-S63 - Manual (Page 338)

Chapter 29: Internet Protocol Version 4 Packet Routing
338 Section VII: Routing
Route Selection Process
Here is the route selection process the switch goes through when routing
packets to a destination:
ˆ If there is only one route to a destination, forward the packets using the
route.
ˆ If there is more than one route to a destination, select the route with
the lowest preference value.
ˆ If there is more than one route with the lowest preference value, select
the route with the lowest metric value.
ˆ If there is more than one route with the lowest metric value, select the
route with the most specific netmask.
ˆ If there is more than one route with the most specific netmask and if
Equal-Cost Multipath (ECMP) routing is enabled, distribute the
packets equally across the routes. The default setting for ECMP is
enabled.
ˆ If there is more than one route with the most specific netmask and if
Equal-Cost Multipath (ECMP) routing is disabled, select the first
remaining route.