The total number of Layer 3flows that have been
removed from the layer 3 hardware flow tables across
all modules by the Layer 3 aging task. This number may
increase quickly if routing protocols are not stable. Removal
or insertion of routes into the forwarding table will cause
premature aging of flows. Flows are normally aged/removed
from the hardware when there are no more packets being sent
for a defined time period.
This counter is cumulative from the time the system started.