Cisco Catalyst 2960 Series, Configuration Manual

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Definition Category
This category is represented by the sys_reqinfo _ xxx
family of system-specific information commands.
These commands are used by a policy to gather
system information.
EEM system information Tcl command extensions
These Tcl command extensions are used to store and
retrieve a Tcl context (the visible variables and their
values). EEM context Tcl command extensions
General Flow of EEM Event Detection and Recovery
EEM is a flexible, policy-driven framework that supports in-box monitoring of different components of the
system with the help of software agents known as event detectors. The figure below shows the relationship
between the EEM server, the core event publishers (event detectors), and the event subscribers (policies).
Basically, event publishers screen events and publish them when there is a match on an event specification
that is provided by the event subscriber. Event detectors notify the EEM server when an event of interest
occurs.
When an event or fault is detected, Embedded Event Manager determines from the event publishers--an
example would be the OIR events publisher in the figure below--if a registration for the encountered fault or
event has occurred. EEM matches the event registration information with the event data itself. A policy
registers for the detected event with the Tcl command extension
event_register _ xxx . The event information
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About Writing Embedded Event Manager Policies Using Tcl