Configuration Guide SEM Configuration
Watchdog timer event: The timer is set to the seconds elapsed from policy
initiation. Each time when the timer counts down to zero, the timer will reset and
trigger a timer event.
CRON timer event: CRON is derived from the Greek word of chronos, which
means "time". It is widely applied in Unix-based operating systems to configure
commands to be executed periodically. SEM supports CRON-based time
detection. When the time point described in the CRON string comes, the timer
event is triggered.
Policy actions supported by SEM
SEM supports multiple types of actions, which will be executed after the policy has been
triggered by event. They can help collect information and rectify device/network related
problems. Currently, SEM supports the following types of actions:
1. Execute a CLI command: execute the command configured by the user.
2. Send Syslog: send a message to Syslog.
3. Operate the named counter: operate the named counter in SEM.
4. Switch to a standby engine: switching between main device and standby
device.
5. Reload device: reload the device.
6. Trigger an application-specific event: publish an application-specific event in
SEM.
7. Respond to SNMP operation: respond to the operations detected by SNMP
Object.
8. Suspend policy execution: suspend policy execution for a while.
Environment variables supported by SEM
SEM allows environment variables to be used in policies. SEM supports the following
environment variables:
1. Global variable: When defined by executing "smart manager environment", it
can be used in all policies. Only the value of global variable can be read in
policy.
2. Local variable: The variable generated during policy execution, and can be
classified into system local variable and user local variable. The system local
variable is created by the detector to describe the event occurred. It is read only
and unchangeable. The user local variable is created by policy action, and can
be modified during operation.
In policies, the priority level of local variable is higher than that of global variable. Reading
nonexistent local variable and global variable or modifying read-only local variable will
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