The value of the object tnSapTlsMacPinning specifies whether or not MAC address pinning is active on this SAP. The value will be set by default to disabled. However for a SAP that belongs to a residential SHG, the value is set to enabled by the system, and cannot be altered by the operator. Setting the value to enable disables re-learning of MAC addresses on other SAPs or spoke-SDPs within the same VPLS; the MAC address will hence remain attached to the SAP for the duration of its age-timer. This object has effect only for MAC addresses learned via the normal MAC learning process, and not for entries learned via DHCP.