Maximum number of unicast dynamic MAC (L2) entries hardware can learn in the system, in a configured time interval 'issMacLearnRateLimitInterval'. In next subsequent time interval, hardware can learn number of previously learnt MAC entries plus present 'issMacLearnRateLimit' value, this cycle will continue until MAC learning reaches to maximum number of L2 unicast dynamic entries learning capacity of the system. If rate limit is changed while 'issMacLearnLimitRateInterval' timer is running, new rate limit value takes effect on next timer restart. This limit is to control the number of MAC entries indication to control plane from hardware, when hardware MAC learning is enabled. Configuration value '0' disables this feature in the system. This configuration does not impose any restrictions on multicast/broadcast and dynamic/static/protocol(MMRP) MAC learning capability limits.