disableLearning is a read-write INTEGER with values enable(1) or disable(2), defaulting to enable, that controls whether a specific interface performs dynamic MAC address learning. Admins set it to disable(2) on ports where they want to prevent the switch from automatically learning new source MAC addresses, a common step in port-security hardening. An admin locking down an untrusted access port would set disableLearning to disable(2) so only manually configured static MAC entries are forwarded on that interface.