CHAPTER8 Advanced SNMP Features
Mediant 800 SBC | SNMP Reference Guide
■ The first few objects are scalars that are read-only objects for the dry-contacts’ state.
■ acSysModuleTable: A table containing mostly status information that describes the
modules in the system. In addition, the table can be used to reset an entire system, reset
a redundant module or perform switchover when for devices supporting HA.
High-Availability Systems
For the management of the High Availability (HA) systems, use the acSysChassis MIB subtree
(as in the above section). The acSysModuleTable gives the HA state of the system. This
includes defining which modules are active and which are in standby mode (redundant). The
table also enables to read some of the statuses of the redundant modules (such as SW
version, HW version, temperature, license key list, etc.). Resetting the system, resetting the
redundant module, and performing switchover are performed done using this table.
Complementing the above are the following alarm traps (as defined in the acBoard MIB):
■ acHASystemFaultAlarm: the HA is faulty and therefore, there is no HA.
■ acHASystemConfigMismatchAlarm: configuration to the modules in the HA system us
uneven causing instability.
■ acHASystemSwitchOverAlarm: a switchover from the active to the redundant module has
occurred.
SNMP Administrative State Control
Node maintenance for the device is provided via an SNMP interface. The acBoardMIB provides
two parameters for graceful and forced shutdowns of the device. These parameters are in the
acBoardMIB as follows:
■ acSysActionAdminState: Read-write MIB object. When a GET request is sent for this
object, the agent returns the current device administrative state - determines the device's
desired operational state:
● locked (0): Shutdown the device in the time frame set by acSysAc-
tionAdminStateLockTimeout.
● shuttingDown (1): (read-only) Graceful shutdown is being performed - existing calls
are allowed to complete, but no new calls are allowed.
● unlocked (2): The device is in service.
On a SET request, the manager supplies the required administrative state, either locked(0)
or unlocked(2). When the device changes to either shuttingDown or locked state, an
adminStateChange alarm is sent. When the device changes to an unlocked state, the
adminStateChange alarm is cleared.
■ acSysActionAdminStateLockTimeout: Defines the time remaining (in seconds) for the
shutdown to complete:
● 0: immediate shutdown and calls are terminated (forced lock)
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