Alcatel-Lucent 7950 SR, System Management Manual

Page: 446 / 462

Facility Alarm Hierarchy
Page 446 7950 SR OS System Management Guide
Facility Alarm Hierarchy
Facility Alarms for children objects is not raised for failure of a parent object. For example, when
an MDA/XMA fails (or is shutdown ) there is not a set of port alarms raised.
When a parent alarm is cleared, children alarms that are still in occurrence on the node appears in
the active alarms list. For example, when a port fails there is a port alarm, but if the MDA/XMA is
later shutdown the port alarm is cleared (and a card alarm will be active for the MDA/XMA). If
the MDA/XMA comes back into service, and the port is still down, then a port alarm becomes
active once again.
The supported Facility Alarm hierarchy is as follows (parent objects that are down cause alarms in
all children to be masked):
• CPM -> Compact Flash
• CCM -> Compact Flash
• IOM/IMM -> MDA -> Port -> Channel
• XCM -> XMA -> Port
• MCM -> MDA -> Port -> Channel
Note that a masked alarm is not the same as a cleared alarm. The cleared alarm queue does not
display entries for previously raised alarms that are currently masked. If the masking event goes
away, then the previously raised alarms will once again be visible in the active alarm queue.