Why the ADSL interface can still display Time of Last Activation when the Trap switch is off?
When activated, the device interface reports a trap packet. The time when R8 NM server receives this packet (system time of NM server) is the Time of Last Activation. The time is stored in memory. If the background process of the network element re-starts, the time record is lost.
Normally, the trap switch on ADSL interface’s right-key menu controls whether the Trap packet is reported when the ADSL interface is activated. However, even if this switch is off, the Time of Last Activation is still displayed. This is because another switch exists: the ADSL interface list. Open the ADSL interface list. Then the trap switches of all the interfaces displayed are turned on.
The relation of the trap switches between ADSL interface list and the ADSL interface’s right-key menu is an "or" relation, that is, if one of the above two is on, the interface reports the Trap packet when activated (given that the main trap switches, such as enable trap, is turned on).
Therefore, if the ADSL interface list is turned on, the NMS displays Time of Last Activation when it receives an interface-activation trap packet, regardless of whether the trap switch is on or off.