This selects which specific algorithm the switch uses to enforce this circuit's committed and excess rate limits -- a jump-window scheme or a simpler scheme, defaulting to simple(2) -- which affects how smoothly or abruptly the policing reacts to bursts even though both schemes ultimately enforce the same configured Cir/Bc/Be. An admin troubleshooting a circuit that discards traffic more aggressively than its configured Bc/Be would suggest should check whether cktRateEnforceSchm is set to jump(1) rather than the smoother default, since the enforcement algorithm itself changes how burst tolerance is applied moment to moment. For example, switching a bursty-traffic circuit from jump(1) to simple(2) enforcement could reduce discards for traffic patterns that were tripping the more rigid jump-window boundaries even while nominally staying within the circuit's overall Bc/Be budget.