The current operational state of CEF.
If the cefCfgAdminState is disabled(2), then
cefOperState will eventually go to the down(2)
state unless some error has occurred.
If cefCfgAdminState is changed to enabled(1) then
cefCfgOperState should change to up(1) only if the
CEF entity is ready to forward the packets using
Cisco Express Forwarding (CEF) else it should remain
in the down(2) state. The up(1) state for this object
indicates that CEF entity is forwarding the packet
using Cisco Express Forwarding.