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Contents

Writing Embedded Event Manager Policies Using the Cisco IOS CLI

Last Updated: December 29, 2012

This module describes how to write Embedded Event Manager (EEM) policies using Cisco IOS command-line interface (CLI) applets to handle Cisco software faults and events. EEM is a distributed and customized approach to event detection and recovery offered directly in a Cisco IOS device. EEM offers the ability to monitor events and take informational, corrective, or any desired action when the monitored events occur or when a threshold is reached. The EEM policy engine receives notifications when faults and other events occur. EEM policies implement recovery on the basis of the current state of the system and the actions specified in the policy for a given event. Recovery actions are triggered when the policy is run.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for Writing EEM Policies Using the Cisco IOS CLI

  • Before writing EEM policies, you should be familiar with the concepts explained in the "Embedded Event Manager Overview" module.
  • If the action cns-event command is used, access to a Cisco Networking Services (CNS) Event gateway must be configured.
  • If the action force-switchover command is used, a secondary processor must be configured on the device.
  • If the action snmp-trap command is used, the snmp-server enable traps event-manager command must be enabled to permit SNMP traps to be sent from the Cisco IOS device to the SNMP server. Other relevant snmp-server commands must also be configured; for details see the action snmp-trap command page.

Information About Writing EEM Policies Using the Cisco IOS CLI

Embedded Event Manager Policies

EEM offers the ability to monitor events and take informational or corrective action when the monitored events occur or a threshold is reached. An EEM policy is an entity that defines an event and the actions to be taken when that event occurs. There are two types of EEM policies: an applet or a script. An applet is a simple form of policy that is defined within the CLI configuration. A script is a form of policy that is written in Tool Command Language (Tcl).

EEM Applet

An EEM applet is a concise method for defining event screening criteria and the actions to be taken when that event occurs. In applet configuration mode, three types of configuration statements are supported. The event commands are used to specify the event criteria to trigger the applet to run, the action commands are used to specify an action to perform when the EEM applet is triggered, and the set command is used to set the value of an EEM applet variable. Currently only the _exit_status variable is supported for the set command.

Only one event configuration command is allowed within an applet configuration. When applet configuration mode is exited and no event command is present, a warning is displayed stating that no event is associated with this applet. If no event is specified, this applet is not considered registered. When no action is associated with this applet, events are still triggered but no actions are performed. Multiple action configuration commands are allowed within an applet configuration. Use the show event manager policy registered command to display a list of registered applets.

Before modifying an EEM applet, be aware that the existing applet is not replaced until you exit applet configuration mode. While you are in applet configuration mode modifying the applet, the existing applet may be executing. It is safe to modify the applet without unregistering it. When you exit applet configuration mode, the old applet is unregistered and the new version is registered.

The action configuration commands are uniquely identified using the label argument, which can be any string value. Actions are sorted in ascending alphanumeric key sequence using the label argument as the sort key, and they are run using this sequence.

The Embedded Event Manager schedules and runs policies on the basis of an event specification that is contained within the policy itself. When applet configuration mode is exited, EEM examines the event and action commands that are entered and registers the applet to be run when a specified event occurs.

EEM Script

Scripts are defined off the networking device using an ASCII editor. The script is then copied to the networking device and registered with EEM. Tcl scripts are supported by EEM.

EEM allows you to write and implement your own policies using Tcl. Writing an EEM policy involves:

  • Selecting the event for which the policy is run.
  • Defining the event detector options associated with logging and responding to the event.
  • Choosing the actions to be followed when the event occurs.

Cisco provides enhancements to Tcl in the form of keyword extensions that facilitate the development of EEM policies. The main categories of keywords identify the detected event, the subsequent action, utility information, counter values, and system information. For more details about writing EEM policies using Tcl, see the "Writing Embedded Event Manager Policies Using Tcl" module.

Embedded Event Manager Built-In Environment Variables Used in EEM Applets

EEM built-in environment variables are a subset of the Cisco-defined environment variables and the built-in variables are available to EEM applets only. The built-in variables can be read-only or can be read and write and these variables may apply to one specific event detector or to all event detectors. The table below lists the Cisco built-in environment variables that are read-only alphabetically by event detector and subevent.

Table 1EEM Built-In Environment Variables (Read Only)

Environment Variable

Description

All Events

_event_id

Unique number that indicates the ID for this published event. Multiple policies may be run for the same event, and each policy will have the same event_id.

_event_type

Type of event.

_event_type_string

An ASCII string identifier of the event type that triggered the event.

_event_pub_sec _event_pub_msec

The time, in seconds and milliseconds, at which the event was published to the EEM.

_event_severity

The severity of the event.

Application-Specific Event Detector

_application_component_id

The event application component identifier.

_application_data1

The value of an environment variable, character text, or a combination of the two to be passed to an application-specific event when the event is published.

_application_data2

The value of an environment variable, character text, or a combination of the two to be passed to an application-specific event when the event is published.

_application_data3

The value of an environment variable, character text, or a combination of the two to be passed to an application-specific event when the event is published.

_application_data4

The value of an environment variable, character text, or a combination of the two to be passed to an application-specific event when the event is published.

_application_sub_system

The event application subsystem number.

_application_type

The type of application.

CLI Event Detector

_cli_msg

The fully expanded message that triggered the CLI event.

_cli_msg_count

The number of times that a message match occurred before the event was published.

Counter Event Detector

_counter_name

The name of the counter.

_counter_value

The value of the counter.

Enhanced Object Tracking Event Detector

_track_number

The number of the tracked object.

_track_state

The state of the tracked object; down or up.

GOLD Event Detector

_action_notify

The action notify information in a GOLD event flag; either false or true.

_event_severity

The event severity which can be one of the following; normal, minor, or major.

_gold_bl

The boot diagnostic level, which can be one of the following values:

  • 0: complete diagnostic
  • 1: minimal diagnostic
  • 2: bypass diagnostic

_gold_card

The card on which a GOLD failure event was detected.

_gold_cf testnum

Consecutive failure, where testnum is the test number. For example, _gold_cf3 is the EEM built-in environment variable for consecutive failure of test 3.

_gold_ci

Card index.

_gold_cn

Card name.

_gold_ec testnum

Test error code, where testnum is the test number. For example, _gold_ec3 is the EEM built-in environment variable for the error code of test 3.

_gold_lf testnum

Last fail time, where testnum is the test number. For example, _gold_lf3 is the EEM built-in variable for the last fail time of test 3.

The time-stamp format is mmm dd yyyy hh:mm:ss. For example, Mar 11 2005 08:47:00.

_gold_new_failure

The new test failure information in a GOLD event flag; either true or false.

_gold_overall_result

The overall diagnostic result, which can be one of the following values:

  • 0: OK
  • 3: minor error
  • 4: major error
  • 14: unknown result

_gold_pc

Port counts.

_gold_rc testnum

Test total run count, where testnum is the test number. For example, _gold_rc3 is the EEM built-in variable for the total run count of test 3.

_gold_sn

Card serial number.

_gold_sub_card

The subcard on which a GOLD failure event was detected.

_gold_ta testnum

Test attribute, where testnum is the test number. For example, _gold_ta3 is the EEM built-in variable for the test attribute of test 3.

_gold_tc

Test counts.

_gold_tf testnum

Total failure count, where testnum is the test number. For example, _gold_tf3 is the EEM built-in variable for the total failure count of test 3.

_gold_tn testnum

Test name, where testnum is the test number. For example, _gold_tn3 is the EEM built-in variable for the name of test 3.

_gold_tr testnum

Test result, where testnum is the test number. For example, _gold_tr6 is the EEM built-in variable for test 6, where test 6 is not a per-port test and not a per-device test.

The test result is one of the following values:

  • P: diagnostic result Pass
  • F: diagnostic result Fail
  • U: diagnostic result Unknown

_gold_tr testnum d devnum

Per-device test result, where testnum is the test number and devnum is the device number. For example, _gold_tr3d20 is the EEM built-in variable for the test result for test 3, device 20.

The test result is one of the following values:

  • P: diagnostic result Pass
  • F: diagnostic result Fail
  • U: diagnostic result Unknown

_gold_tr testnum p portnum

Per-port test result, where testnum is the test number and portnum is the port number. For example, _gold_tr5p20 is the EEM built-in variable for the test result for test 5, port 20.

The test result is one of the following values:

  • P: diagnostic result Pass
  • F: diagnostic result Fail
  • U: diagnostic result Unknown

_gold_tt

The testing type, which can be one of the following:

  • 1: a boot diagnostic
  • 2: an on-demand diagnostic
  • 3: a schedule diagnostic
  • 4: a monitoring diagnostic

Interface Counter Event Detector

_interface_is_increment

A value to indicate whether the current interface counter value is an absolute value (0) or an increment value (1).

_interface_name

The name of the interface to be monitored.

_interface_parameter

The name of the interface counter to be monitored.

_interface_value

A value with which the current interface counter value is compared.

None Event Detector

_event_id

A value of 1 indicates an insertion event; a value of 2 indicates a removal event.

_none_argc

_none_arg1

_none_arg2

_none_arg3

_none_arg4

_none_arg5

_none_arg6

_none_arg7

_none_arg8

_none_arg9

_none_arg10

_none_arg11

_none_arg12

_none_arg13

_none_arg14

_none_arg15

The parameters that are passed from the XML SOAP command to the script.

OIR Event Detector

_oir_event

A value of 1 indicates an insertion event; a value of 2 indicates a removal event.

_oir_slot

The slot number for the OIR event.

Resource Event Detector

_resource_configured_threshold

The configured ERM threshold.

_resource_current_value

The current value reported by ERM.

_resource_dampen_time

The ERM dampen time, in nanoseconds.

_resource_direction

The ERM event direction. The event direction can be one of the following: up, down, or no change.

_resource_level

The ERM event level. The four event levels are normal, minor, major, and critical.

_resource_notify_data_flag

The ERM notify data flag.

_resource_owner_id

The ERM resource owner ID.

_resource_policy_id

The ERM policy ID.

_resource_policy_violation_flag

The ERM policy violation flag; either false or true.

_resource_time_sent

The ERM event time, in nanoseconds.

_resource_user_id

The ERM resource user ID.

RF Event Detector

_rf_event

A value of 0 indicates that this is not an RF event; a value of 1 indicates an RF event.

RPC Event Detector

_rpc_event

A value of 0 indicates that there is no error; a value of 1 to 83 indicates error.

_rpc_argc

_rpc_arg0

_rpc_arg1

_rpc_arg2

_rpc_arg3

_rpc_arg4

_rpc_arg5

_rpc_arg6

_rpc_arg7

_rpc_arg8

_rpc_arg9

_rpc_arg10

_rpc_arg11

_rpc_arg12

_rpc_arg13

_rpc_arg14

The parameters that are passed from the XML SOAP command to the applet.

SNMP Event Detector

_snmp_exit_event

A value of 0 indicates that this is not an exit event; a value of 1 indicates an exit event.

_snmp_oid

The SNMP object ID that caused the event to be published.

_snmp_oid_delta_val

The actual incremental difference between the value of the current SNMP object ID and the value when the event was last triggered.

_snmp_oid_val

The SNMP object ID value when the event was published.

SNMP Notification Event Detector

_snmp_notif_oid

A user specified object ID.

_snmp_notif_oid_val

A user specified object ID value.

_snmp_notif_src_ip_addr

The source IP address of the SNMP Protocol Data Unit (PDU).

_snmp_notif_dest_ip_addr

The destination IP address of the SNMP PDU.

_x_x_x_x_x_x_x(varbinds)

The SNMP PDU varbind information.

_snmp_notif_trunc_vb_buf

Indicates whether the varbind information has been truncated due to the lack of space in the buffer.

Syslog Event Detector

_syslog_msg

The syslog message that caused the event to be published.

System Manager (Process) Event Detector

_process_dump_count

The number of times that a Posix process was dumped.

_process_exit_status

The status of the Posix process at exit.

_process_fail_count

The number of times that a Posix process failed.

_process_instance

The instance number of the Posix process.

_process_last_respawn

The Posix process that was last respawned.

_process_node_name

The node name of the Posix process.

_process_path

The path of the Posix process.

_process_process_name

The name of the Posix process.

_process_respawn_count

The number of times that a Posix process was respawned.

Timer Event Detector

_timer_remain

The time available before the timer expires.

Note    This environment variable is not available for the CRON timer.

_timer_time

The time at which the last event was triggered.

_timer_type

The type of timer.

Watchdog System Monitor (IOSWDSysMon) Event Detector

_ioswd_node

The slot number for the Route Processor (RP) reporting node.

_ioswd_num_subs

The number of subevents present.

All Watchdog System Monitor (IOSWDSysMon) Subevents

_ioswd_sub1_present _ioswd_sub2_present

A value to indicate whether subevent 1 or subevent 2 is present. A value of 1 means that the subevent is present; a value of 0 means that the subevent is not present.

_ioswd_sub1_type _ioswd_sub2_type

The event type, either cpu_proc or mem_proc.

Watchdog System Monitor (IOSWDSysMon) cpu_proc Subevents

_ioswd_sub1_path _ioswd_sub2_path

A process name of subevents.

_ioswd_sub1_period _ioswd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_ioswd_sub1_pid _ioswd_sub2_pid

The process identifier of subevents.

_ioswd_sub1_taskname _ioswd_sub2_taskname

The task name of subevents.

_ioswd_sub1_value _ioswd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (IOSWDSysMon) mem_proc Subevents

_ioswd_sub1_diff _ioswd_sub2_diff

A percentage value of the difference that triggered the event.

Note    This variable is set only when the _ioswd_sub1_is_percent or _ioswd_sub2_is_percent variable contains a value of 1.

_ioswd_sub1_is_percent _ioswd_sub2_is_percent

A number that identifies whether the value is a percentage. A value of 0 means that the value is not a percentage; a value of 1 means that the value is a percentage.

_ioswd_sub1_path _ioswd_sub2_path

The process name of subevents.

_ioswd_sub1_pid _ioswd_sub2_pid

The process identifier of subevents.

_ioswd_sub1_taskname _ioswd_sub2_taskname

The task name of subevents.

_ioswd_sub1_value _ioswd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (WDSysMon) Event Detector

_wd_sub1_present _wd_sub2_present

A value to indicate whether subevent 1 or subevent 2 is present. A value of 1 means that the subevent is present; a value of 0 means that the subevent is not present.

_wd_num_subs

The number of subevents present.

_wd_sub1_type _wd_sub2_type

The event type: cpu_proc, cpu_tot, deadlock, dispatch_mgr, mem_proc, mem_tot_avail, or mem_tot_used.

Watchdog System Monitor (WDSysMon) cpu_proc Subevents

_wd_sub1_node _wd_sub2_node

The slot number for the subevent RP reporting node.

_wd_sub1_period _wd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_wd_sub1_procname _wd_sub2_procname

The process name of subevents.

_wd_sub1_value _wd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (WDSysMon) cpu_tot Subevents

_wd_sub1_node _wd_sub2_node

The slot number for the subevent RP reporting node.

_wd_sub1_period _wd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_wd_sub1_value _wd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (WDSysMon) deadlock Subevents

_wd_sub1_entry_ [1-N]_b_node _wd_sub2_entry_[1-N]_b_node

The slot number for the subevent RP reporting node.

_wd_sub1_entry_ [1-N]_b_pid _wd_sub2_entry_[1-N]_b_pid

The process identifier of subevents.

_wd_sub1_entry_ [1-N]_b_procname _wd_sub2_entry_[1-N]_b_procname

The process name of subevents.

_wd_sub1_entry_ [1-N]_b_tid _wd_sub2_entry_[1-N]_b_tid

The time identifier of subevents.

_wd_sub1_entry_ [1-N]_node _wd_sub2_entry_[1-N]_node

The slot number for the subevent RP reporting node.

_wd_sub1_entry_ [1-N]_pid _wd_sub2_entry_[1-N]_pid

The process identifier of subevents.

_wd_sub1_entry_ [1-N]_procname _wd_sub2_entry_[1-N]_procname

The process name of subevents.

_wd_sub1_entry_ [1-N]_state _wd_sub2_entry_[1-N]_state

The time identifier of subevents.

_wd_sub1_entry_ [1-N]_tid _wd_sub2_entry_[1-N]_tid

The time identifier of subevents.

_wd_sub1_num_entries _wd_sub2_num_entries

The number of subevents.

Watchdog System Monitor (WDSysMon) dispatch manager Subevents

_wd_sub1_node _wd_sub2_node

The slot number for the subevent RP reporting node.

_wd_sub1_period _wd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_wd_sub1_procname _wd_sub2_procname

The process name of subevents.

_wd_sub1_value _wd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (WDSysMon) mem_proc Subevents

_wd_sub1_diff _wd_sub2_diff

A percentage value of the difference that triggered the event.

Note    This variable is set only when the _wd_sub1_is_percent or _wd_sub2_is_percent variable contains a value of 1.

_wd_sub1_is_percent _wd_sub2_is_percent

A number that identifies whether the value is a percentage. A value of 0 means that the value is not a percentage; a value of 1 means that the value is a percentage.

_wd_sub1_node _wd_sub2_node

The slot number for the subevent RP reporting node.

_wd_sub1_period _wd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_wd_sub1_pid _wd_sub2_pid

The process identifier of subevents.

_wd_sub1_procname _wd_sub2_procname

The process name of subevents.

_wd_sub1_value _wd_sub2_value

The CPU utilization of subevents measured as a percentage.

Watchdog System Monitor (WDSysMon) mem_tot_avail and mem_tot_used Subevents

_wd_sub1_avail _wd_sub2_avail

The memory available for subevents.

_wd_sub1_diff _wd_sub2_diff

A percentage value of the difference that triggered the event.

Note    This variable is set only when the _wd_sub1_is_percent or _wd_sub2_is_percent variable contains a value of 1.

_wd_sub1_is_percent _wd_sub2_is_percent

A number that identifies whether the value is a percentage. A value of 0 means that the value is not a percentage; a value of 1 means that the value is a percentage.

_wd_sub1_node _wd_sub2_node

The slot number for the subevent RP reporting node.

_wd_sub1_period _wd_sub2_period

The time period, in seconds and optional milliseconds, used for measurement in subevents.

_wd_sub1_value _wd_sub2_value

The CPU utilization of subevents measured as a percentage.

_wd_sub1_used _wd_sub2_used

The memory used by subevents.

How to Write EEM Policies Using the Cisco IOS CLI

Registering and Defining an Embedded Event Manager Applet

Perform this task to register an applet with Embedded Event Manager and to define the EEM applet using the Cisco IOS CLI event and action commands. Only one event command is allowed in an EEM applet. Multiple action commands are permitted. If no event and no action commands are specified, the applet is removed when you exit configuration mode.

The SNMP event detector and the syslog action commands used in this task are just representing any event detector and action commands. For examples using other event detectors and action commands, see the Embedded Event Manager Applet Configuration Examples.

EEM Environment Variables

EEM environment variables for EEM policies are defined using the EEM event manager environment configuration command. By convention, all Cisco EEM environment variables begin with " _ ". In order to avoid future conflict, customers are urged not to define new variables that start with " _ ".

You can display the EEM environment variables set on your system by using the show event manager environment privileged EXEC command.

For example, you can create EEM policies that can send e-mails when an event occurs. The table below describes the e-mail-specific environment variables that can be used in EEM policies.

Table 2EEM E-mail-Specific Environmental Variables

Environment Variable

Description

Example

_email_server

A Simple Mail Transfer Protocol (SMTP) mail server used to send e-mail.

The e-mail server name--Mailservername-- can be in any one of the following template formats:

  • username:password@host
  • username@host
  • host

_email_to

The address to which e-mail is sent.

engineering@example.com

_email_from

The address from which e-mail is sent.

devtest@example.com

_email_cc

The address to which the e-mail is copied.

manager@example.com

Alphabetical Order of EEM Action Labels

An EEM action label is a unique identifier that can be any string value. Actions are sorted and run in ascending alphanumeric (lexicographical) key sequence using the label as the sort key. If you are using numbers as labels be aware that alphanumerical sorting will sort 10.0 after 1.0, but before 2.0, and in this situation we recommend that you use numbers such as 01.0, 02.0, and so on, or use an initial letter followed by numbers.

SUMMARY STEPS

1.    enable

2.    show event manager environment [all| variable-name]

3.    configure terminal

4.    event manager environment variable-name string

5.    Repeat Step 4 for all the required environment variables.

6.    event manager applet applet-name

7.   Do one of the following:

  • event snmp oid oid-value get-type {exact| next} entry-op operator entry-val entry-value[exit-comb| and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value

8.    action label cli command cli-string [pattern pattern-string]

9.    action label syslog [priority priority-level] msg msg-text facility string

10.    action label mail server server-address to to-address from from-address [cc cc-address] subject subject body body-text

11.    Add more action commands as required.

12.    end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager environment [all| variable-name]


Example:

Device# show event manager environment all

 

(Optional) Displays the name and value of EEM environment variables.

  • The optional all keyword displays all the EEM environment variables.
  • The optional variable-nameargument displays information about the specified environment variable.
 
Step 3
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 4
event manager environment variable-name string


Example:

Device(config)# event manager environment _email_to engineering@example.com

 

Configures the value of the specified EEM environment variable.

  • In this example, the environment variable that holds the e-mail address to which e-mail is sent is set to engineering@example.com.
 
Step 5
Repeat Step 4 for all the required environment variables.  

Repeat Step 4 to configure all the environment variables required by the policy to be registered in Step 6 .

 
Step 6
event manager applet applet-name


Example:

Device(config)# event manager applet memory-fail

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 7
Do one of the following:
  • event snmp oid oid-value get-type {exact| next} entry-op operator entry-val entry-value[exit-comb| and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value


Example:

Device(config-applet)# event snmp oid 1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact entry-op lt entry-val 5120000 poll-interval 90

 

Specifies the event criteria that cause the EEM applet to run.

  • In this example, an EEM event is triggered when free memory falls below the value of 5120000.
  • Exit criteria are optional, and if not specified, event monitoring is reenabled immediately.
 
Step 8
action label cli command cli-string [pattern pattern-string]


Example:

Device(config-applet)# action 1.0 cli command "enable"



Example:

Device(config-applet)# action 2.0 cli command "clear counters Ethernet0/1" pattern "confirm"



Example:

Device(config-applet)# action 3.0 cli command "y"

 

Specifies the action of executing a Cisco IOS CLI command when an EEM applet is triggered.

The pattern keyword is optional and is used only when the command string solicits input. The action clicommand ends when the solicited prompt as specified in the optional pattern keyword is received. You are required to specify a regular expression pattern that will match the next solicited prompt. Specification of an incorrect pattern will cause the action cli command to wait forever until the applet execution times out due to the maxrun timer expiration.

  • The action taken is to specify an EEM applet to run when the pattern keyword specifies the confirm argument for the clear counters Ethernet0/1 command. In this case the command string solicits input, such as "confirm," which has to be completed with a "yes" or a "no" input.
 
Step 9
action label syslog [priority priority-level] msg msg-text facility string


Example:

Device(config-applet)# action 1.0 syslog priority critical msg "Memory exhausted; current available memory is $_snmp_oid_val bytes"



Example:

Device(config-applet)# action 1.0 syslog priority errors facility EEM-FAC message "TEST MSG"

 

Specifies the action to be taken when an EEM applet is triggered.

In this example, the action taken is to write a message to syslog.

  • The optional priority keyword specifies the priority level of the syslog messages. If selected, the priority-level argument must be defined.
  • The msg-text argument can be character text, an environment variable, or a combination of the two.
  • The facility keyword specifies the location of generated message
  • The string argument can be character text, an environment variable, or a combination of the two.
 
Step 10
action label mail server server-address to to-address from from-address [cc cc-address] subject subject body body-text


Example:

Device(config-applet)# action 2.0 mail server 192.168.1.10 to engineering@example.com from devtest@example.com subject "Memory failure" body "Memory exhausted; current available memory is $_snmp_oid_val bytes"

 

Specifies the action of sending a short e-mail when an EEM applet is triggered.

  • The server-address argument specifies the fully qualified domain name of the e-mail server to be used to forward the e-mail.
  • The to-address argument specifies the e-mail address where the e-mail is to be sent.
  • The from-address argument specifies the e-mail address from which the e-mail is sent.
  • The subject argument specifies the subject line content of the e-mail as an alphanumeric string.
  • The body-text argument specifies the text content of the e-mail as an alphanumeric string.
 
Step 11
Add more action commands as required.  

--

 
Step 12
end


Example:

Device(config-applet)# end

 

Exits applet configuration mode and returns to privileged EXEC mode.

 

Troubleshooting Tips

Use the debug event manager command in privileged EXEC mode to troubleshoot EEM command operations. Use any debugging command with caution as the volume of generated output can slow or stop the device operations. We recommend that this command be used only under the supervision of a Cisco engineer.

Registering and Defining an Embedded Event Manager Policy to Run Manually

There are two ways to manually run an EEM policy. EEM usually schedules and runs policies on the basis of an event specification that is contained within the policy itself. The event none command allows EEM to identify an EEM policy that can be manually triggered. To run the policy, use either the action policy command in applet configuration mode or the event manager run command in privileged EXEC mode.

Perform this task to register an EEM policy to be run manually using the event manager run command. For an example of how to manually run a policy using the action policy command, see the Embedded Event Manager Manual Policy Execution Examples.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event none

5.    action label syslog [priority priority-level] msg msg-text facility string

6.    end

7.    event manager run applet-name


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet manual-policy

 

Registers the applet with the Embedded Event Manager and enters applet configuration mode.

 
Step 4
event none


Example:

Device(config-applet)# event none

 

Specifies that an EEM policy is to be registered with the EEM and can be run manually.

 
Step 5
action label syslog [priority priority-level] msg msg-text facility string


Example:

Device(config-applet)# action 1.0 syslog msg "Manual-policy triggered"

 

Specifies the action to be taken when an EEM applet is triggered.

In this example, the action to be taken is to write a message to syslog.

  • The optional priority keyword specifies the priority level of the syslog messages. If selected, the priority-level argument must be defined.
  • The msg-text argument can be character text, an environment variable, or a combination of the two.
  • The facility keyword specifies the location of generated message.
  • The string argument can be character text, an environment variable, or a combination of the two.
 
Step 6
end


Example:

Device(config-applet)# end

 

Exits applet configuration mode and returns to privileged EXEC mode.

 
Step 7
event manager run applet-name


Example:

Device# event manager run manual-policy

 

Manually runs a registered EEM policy.

 

Unregistering Embedded Event Manager Policies

Perform this task to remove an EEM policy from the running configuration file. Execution of the policy is canceled.

SUMMARY STEPS

1.    enable

2.    show event manager policy registered [description [policy-name] | detailed policy-filename [system | user] | [event-type event-name] [system | user] [time-ordered | name-ordered]]

3.    configure terminal

4.    no event manager policy policy-filename

5.    exit

6.    Repeat Step 2 to ensure that the policy has been removed.


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy registered [description [policy-name] | detailed policy-filename [system | user] | [event-type event-name] [system | user] [time-ordered | name-ordered]]


Example:

Device# show event manager policy registered

 

(Optional) Displays the EEM policies that are currently registered.

  • The optional systemand user keywords display the registered system and user policies.
  • If no keywords are specified, EEM registered policies for all event types are displayed in time order.
 
Step 3
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 4
no event manager policy policy-filename


Example:

Device(config)# no event manager policy IPSLAping1

 

Removes the EEM policy from the configuration, causing the policy to be unregistered.

 
Step 5
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 6
Repeat Step 2 to ensure that the policy has been removed.

Example:

Device# show event manager policy registered

 

--

 

Examples

In the following example, the show event manager policy registered privileged EXEC command is used to display the two EEM applets that are currently registered: 

Device# show event manager policy registered
No.  Class   Type    Event Type          Trap  Time Registered           Name
1    applet  system  snmp                Off   Fri Aug 12 17:42:52 2005  IPSLAping1
 oid {1.3.6.1.4.1.9.9.42.1.2.9.1.6.4} get-type exact entry-op eq entry-val {1}
 exit-op eq exit-val {2} poll-interval 90.000
 action 1.0 syslog priority critical msg "Server IPecho Failed: OID=$_snmp_oid_val" 
 action 1.1 snmp-trap strdata "EEM detected server reachability failure to 10.1.88.9"
 action 1.2 publish-event sub-system 88000101 type 1 arg1 "10.1.88.9" arg2 "IPSLAEcho"
arg3 "fail"
 action 1.3 counter name _IPSLA1F op inc value 1
2    applet  system  snmp                Off   Thu Sep 15 05:57:16 2005  memory-fail
 oid {1.3.6.1.4.1.9.9.48.1.1.1.6.1} get-type exact entry-op lt entry-val {5120000}
poll-interval 90 
 action 1.0 syslog priority critical msg Memory exhausted; current available memory is
$_snmp_oid_val bytes 
 action 2.0 force-switchover

In the following example, the show event manager policy registered privileged EXEC command is used to show that applet IPSLAping1 has been removed after entering the no event manager policy command: 

Device# show event manager policy registered
No.  Class   Type    Event Type          Trap  Time Registered           Name
1    applet  system  snmp                Off   Thu Sep 15 05:57:16 2005  memory-fail
 oid {1.3.6.1.4.1.9.9.48.1.1.1.6.1} get-type exact entry-op lt entry-val {5120000}
poll-interval 90 
 action 1.0 syslog priority critical msg Memory exhausted; current available memory is
$_snmp_oid_val bytes 
 action 2.0 force-switchover

Suspending All Embedded Event Manager Policy Execution

Perform this task to immediately suspend the execution of all EEM policies. Suspending policies, instead of unregistering them might be necessary for reasons of temporary performance or security.

SUMMARY STEPS

1.    enable

2.    show event manager policy registered [description [policy-name] | detailed policy-filename [system | user] | [event-type event-name] [system | user] [time-ordered | name-ordered]]

3.    configure terminal

4.    event manager scheduler suspend

5.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy registered [description [policy-name] | detailed policy-filename [system | user] | [event-type event-name] [system | user] [time-ordered | name-ordered]]


Example:

Device# show event manager policy registered

 

(Optional) Displays the EEM policies that are currently registered.

  • The optional systemand user keywords display the registered system and user policies.
  • If no keywords are specified, EEM registered policies for all event types are displayed in time order.
 
Step 3
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 4
event manager scheduler suspend


Example:

Device(config)# event manager scheduler suspend

 

Immediately suspends the execution of all EEM policies.

 
Step 5
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Configuring and Tracking a Stub Object Using Embedded Event Manager

Perform this task to create a stub object, set the state of the stub object, and configure an EEM applet to be run when the tracked object changes. Actions are specified within the EEM applet to both set and read the state of the object. This task allows EEM to define an enhanced object tracking (EOT) object that may be manipulated by other EOT clients. An EEM policy can be a trigger for any EOT object including objects defined for other EOT clients or for an object defined by EEM.

Enhanced Object Tracking

Object tracking was first introduced into the Hot Standby Router Protocol (HSRP) as a simple tracking mechanism that allowed you to track the interface line-protocol state only. Enhanced object tracking provides complete separation between the objects to be tracked and the action to be taken by a client when a tracked object changes. Thus, several clients such as EEM, VRRP, or GLBP can register their interest with the tracking process, track the same object, and each take different action when the object changes.

Each tracked object is identified by a unique number that is specified on the tracking command-line interface (CLI). Client processes use this number to track a specific object. The tracking process periodically polls the tracked objects and notes any change of value. The changes in the tracked object are communicated to interested client processes, either immediately or after a specified delay. The object values are reported as either up or down.

The EOT event detector publishes an event when the tracked object changes.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    track object-number stub-object

4.    default-state {up| down}

5.    exit

6.    event manager applet applet-name

7.    event [label] track object-number[state{up| down| any}]

8.    action label track set object-number state {up| down}

9.    action label track read object-number

10.    end

11.    show track [object-number[brief]]


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
track object-number stub-object


Example:

Device(config)# track 2 stub-object

 

Creates a stub object to be tracked using EEM and enters tracking configuration mode.

  • Use the object-number argument to assign a number to the tracked object.
 
Step 4
default-state {up| down}


Example:

Device(config-track)# default-state up

 

Sets the default state for a stub object.

  • In this example, the default state of the object is set to up.
 
Step 5
exit


Example:

Device(config-track)# exit

 

Exits tracking configuration mode and returns to global configuration mode.

 
Step 6
event manager applet applet-name


Example:

Device(config)# event manager applet track-two

 

Registers an applet with EEM and enters applet configuration mode.

 
Step 7
event [label] track object-number[state{up| down| any}]


Example:

Device(config-applet)# event track 2 state down

 

Specifies the event criteria that cause the EEM applet to run.

  • In this example, an EEM event is triggered when the Cisco IOS Object Tracking subsystem reports that tracked object number 2 transitions from an up state to a down state.
 
Step 8
action label track set object-number state {up| down}


Example:

Device(config-applet)# action 1.0 track set 2 state up

 

Specifies the action to be taken when an EEM applet is triggered.

  • In this example, the action to be taken is to set the state of tracked object number 2 to up.
 
Step 9
action label track read object-number


Example:

Device(config-applet)# action 2.0 track read 2

 

Specifies the action to be taken when an EEM applet is triggered.

  • In this example, the action to be taken is to read the state of tracked object number 2.
  • The _track_state read-only variable gets set when this command is run.
 
Step 10
end


Example:

Device(config-applet)# end

 

Exits applet configuration mode and returns to privileged EXEC mode.

 
Step 11
show track [object-number[brief]]


Example:

Device# show track 2

 

(Optional) Displays information about objects that are tracked by the tracking process.

  • The optional object-number argument displays tracking information for a specified object.
  • The optional brief keyword displays a single line of information.
 
Examples

In the following example, the show track privileged EXEC command is used to display information about tracked object number 2. 

Device# show track 2
Track 2
  Stub-object
  State is Up
    1 change, last change 00:00:04, by Undefined

Displaying Embedded Event Manager History Data

Perform this optional task to change the size of the history tables and to display EEM history data.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager history size {events | traps} [size]

4.    exit

5.    show event manager history events [detailed] [maximum number]

6.    show event manager history traps {server | policy}


DETAILED STEPS
Step 1   enable

Enables privileged EXEC mode. Enter your password if prompted.



Example: 
Device> enable
Step 2   configure terminal

Enters global configuration mode.



Example: 
Device# configure terminal
Step 3   event manager history size {events | traps} [size]

Use this command to change the size of the EEM event history table or the size of the EEM SNMP trap history table. In the following example, the size of the EEM event history table is changed to 30 entries:



Example: 
Device(config)# event manager history size events 30
Step 4   exit

Exits global configuration mode and returns to privileged EXEC mode.



Example: 
Device(config)# exit
Step 5   show event manager history events [detailed] [maximum number]

Use this command to display detailed information about each EEM event, for example:



Example: 
Device# show event manager history events
No.  Time of Event             Event Type          Name
1    Fri Aug13  21:42:57 2004  snmp                applet: SAAping1 
2    Fri Aug13  22:20:29 2004  snmp                applet: SAAping1 
3    Wed Aug18  21:54:48 2004  snmp                applet: SAAping1 
4    Wed Aug18  22:06:38 2004  snmp                applet: SAAping1 
5    Wed Aug18  22:30:58 2004  snmp                applet: SAAping1 
6    Wed Aug18  22:34:58 2004  snmp                applet: SAAping1 
7    Wed Aug18  22:51:18 2004  snmp                applet: SAAping1 
8    Wed Aug18  22:51:18 2004  application         applet: CustApp1
Step 6   show event manager history traps {server | policy}

Use this command to display the EEM SNMP traps that have been sent either from the EEM server or from an EEM policy. In the following example, the EEM SNMP traps that were triggered from within an EEM policy are displayed.



Example: 
Device# show event manager history traps policy
No.  Time                      Trap Type           Name
1    Wed Aug18  22:30:58 2004  policy              EEM Policy Director
2    Wed Aug18  22:34:58 2004  policy              EEM Policy Director
3    Wed Aug18  22:51:18 2004  policy              EEM Policy Director

Displaying Embedded Event Manager Registered Policies

Perform this optional task to display registered EEM policies.

SUMMARY STEPS

1.    enable

2.    show event manager policy registered [event-type event-name] [time-ordered| name-ordered]


DETAILED STEPS
Step 1   enable

Enables privileged EXEC mode. Enter your password if prompted.



Example: 
Device> enable
Step 2   show event manager policy registered [event-type event-name] [time-ordered| name-ordered]

Use this command with the time-ordered keyword to display information about currently registered policies sorted by time, for example:



Example: 
Device# show event manager policy registered time-ordered
No.  Type    Event Type          Time                    Registered Name 
1    applet  snmp                Thu May30 05:57:16 2004 memory-fail 
 oid {1.3.6.1.4.1.9.9.48.1.1.1.6.1} get-type exact entry-op lt entry-val 
{5120000} poll-interval 90 
action 1.0 syslog priority critical msg "Memory exhausted; current available memory 
is $_snmp_oid_val bytes"
 action 2.0 force-switchover 
2    applet  syslog              Wed Jul16 00:05:17 2004 intf-down
 pattern {.*UPDOWN.*Ethernet1/0.*}
 action 1.0 cns-event msg "Interface state change: $_syslog_msg"

Use this command with the name-ordered keyword to display information about currently registered policies sorted by name, for example:



Example: 
Device# show event manager policy registered name-ordered
No.  Type    Event Type          Time Registered          Name 
1    applet  syslog              Wed Jul16  00:05:17 2004 intf-down
 pattern {.*UPDOWN.*Ethernet1/0.*}
 action 1.0 cns-event msg "Interface state change: $_syslog_msg"
2    applet  snmp                Thu May30 05:57:16 2004   memory-fail 
 oid {1.3.6.1.4.1.9.9.48.1.1.1.6.1} get-type exact entry-op lt entry-val 
{5120000} poll-interval 90 
 action 1.0 syslog priority critical msg "Memory exhausted; current available memory 
is $_snmp_oid_val bytes" 
 action 2.0 force-switchover

Use this command with the event-typekeyword to display information about currently registered policies for the event type specified in the event-name argument, for example:



Example: 
Device# show event manager policy registered event-type syslog
No.  Type    Event Type          Time Registered           Name 
1    applet  syslog              Wed Jul16  00:05:17 2004 intf-down
 pattern {.*UPDOWN.*Ethernet1/0.*}
 action 1.0 cns-event msg "Interface state change: $_syslog_msg"

Configuring Event SNMP Notification

Perform this task to configure SNMP notifications.

Before You Begin
  • SNMP event manager must be configured using the snmp-server manager command.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event [tag event-tag] snmp-notification oid oid-string oid-val comparison-value op operator [maxrun maxruntime-number] [src-ip-address ip-address] [dest-ip-address ip-address] [default seconds] [direction {incoming | outgoing}] [msg-op {drop | send}]

5.    end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet snmp

 

Registers the applet with the event manager server and enters applet configuration mode.

 
Step 4
event [tag event-tag] snmp-notification oid oid-string oid-val comparison-value op operator [maxrun maxruntime-number] [src-ip-address ip-address] [dest-ip-address ip-address] [default seconds] [direction {incoming | outgoing}] [msg-op {drop | send}]


Example:

Device(config-applet)# event snmp-notification dest-ip-address 192.168.1.1 oid 1 op eq oid-val 10

 

Specifies the event criteria for an Embedded Event Manager (EEM) applet that is run by sampling Simple Network Management Protocol (SNMP) notification.

 
Step 5
end


Example:

Device(config-applet)# end

 

Exits applet configuration mode and returns to privileged EXEC mode.

 

Configuring Multiple Event Support

The multiple event support feature adds the ability to register multiple events in the EEM server. The multiple event support involves one or more event occurrences, one or more tracked object states, and a time period for the event to occur. The event parameters are specified in the CLI commands. The data structure to handle multiple events contains multiple event identifiers and correlation logic. This data is used to register multiple events in the EEM Server.

Setting the Event Configuration Parameters

The trigger command enters the trigger applet configuration mode and specifies the multiple event configuration statements for EEM applets. The trigger statement is used to relate multiple event statement using the tag argument specified in each event statement. The events are raised based on the specified parameters.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event [tag event-tag] cli pattern regular-expression sync {yes | no skip {yes | no}} [occurs num-occurrences] [period period-value] [maxrun maxruntime-number]

5.    trigger [occurs occurs-value] [period period-value] [period-start period-start-value] [delay delay-value]

6.    correlate {event event-tag | track object-number} [boolean-operator {event event-tag | track tracked-object} ...]

7.    attribute tag event-tag [occurs occurs-value]

8.    action label cli command cli-string


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet EventInterface

 

Registers an applet with EEM and enters applet configuration mode.

 
Step 4
event [tag event-tag] cli pattern regular-expression sync {yes | no skip {yes | no}} [occurs num-occurrences] [period period-value] [maxrun maxruntime-number]


Example:

Device(config-applet)# event tag 1.0 cli pattern "show bgp all" sync yes occurs 32 period 60 maxrun 60

 

Specifies the event criteria for an EEM applet that is run by matching a Cisco IOS command-line interface (CLI) command.

 
Step 5
trigger [occurs occurs-value] [period period-value] [period-start period-start-value] [delay delay-value]


Example:

Device(config-applet)# trigger occurs 1 period-start "0 8 * * 1-5" period 60

 

Specifies the complex event configuration parameters for an EEM applet.

 
Step 6
correlate {event event-tag | track object-number} [boolean-operator {event event-tag | track tracked-object} ...]


Example:

Device(config-applet)# correlate event 1.0 or event 2.0 and track 10

 

Specifies a complex event correlation in the trigger mode for an EEM applet.

Note    When "and" is used to group events such as traps or syslog messages, then the default trigger occurrence window is three minutes.
 
Step 7
attribute tag event-tag [occurs occurs-value]


Example:

Device(config-applet)# attribute tag 1.0 occurs 1

 

Specifies up to eight attribute statements to build a complex event for an EEM applet.

 
Step 8
action label cli command cli-string


Example:

Device(config-applet)# action 1.0 cli command "show mwmory"

 

Specifies the action of executing a CLI command when an EEM applet is triggered.

 
Examples

In the following example, applet is run if the show bgp all CLI command and any syslog message that contains the string "COUNT" occurred within a period 60 seconds. 

event manager applet delay_50
 event tag 1.0 cli pattern "show bgp all" sync yes occurs 32 period 60 maxrun 60
 event tag 2.0 syslog pattern "COUNT"
 trigger occurs 1 delay 50
  correlate event 1.0 or event 2.0
  attribute tag 1.0 occurs 1
  attribute tag 2.0 occurs 1
 action 1.0 cli command "show memory"
 action 2.0 cli command "enable"
 action 3.0 cli command "config terminal"
 action 4.0 cli command " ip route 192.0.2.0 255.255.255.224 192.0.2.12" 
 action 91.0 cli command "exit"
 action 99.0 cli command "show ip route | incl 192.0.2.5"

Configuring EEM Class-Based Scheduling

To schedule Embedded Event Manager (EEM) policies and set policy scheduling options, perform this task. In this task, two EEM execution threads are created to run applets assigned to the default class.

The EEM policies will be assigned a class using the class keyword when they are registered. EEM policies registered without a class will be assigned to the default class. Threads that have default class, will service the default class when the thread is available for work. Threads that are assigned specific class letters will service any policy with a matching class letter when the thread is available for work.

If there is no EEM execution thread available to run the policy in the specified class and a scheduler rule for the class is configured, the policy will wait until a thread of that class is available for execution. Synchronous policies that are triggered from the same input event should be scheduled in the same execution thread.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager scheduler {applet | axp | call-home} thread class class-options number thread-number

4.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager scheduler {applet | axp | call-home} thread class class-options number thread-number


Example:

Device(config)# event manager scheduler applet thread class default number 2

 

Schedules EEM policies and sets policy scheduling options.

  • In this example, two EEM execution threads are created to run applets assigned to the default class.
 
Step 4
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Holding a Scheduled EEM Policy Event or Event Queue

To hold a scheduled EEM policy event or event queue in the EEM scheduler, perform this task. In this task, all pending EEM policies are displayed. A policy identified using a job ID of 2 is held in the EEM scheduler, and the final step shows that the policy with a job ID of 2 has changed status from pending to held.

SUMMARY STEPS

1.    enable

2.    show event manager policy pending [queue-type{applet | call-home | axp | script} class class-options | detailed]

3.    event manager scheduler hold {all| policy job-id | queue-type {applet | call-home | axp | script} class class-options} [processor {rp_primary| rp_standby}]

4.    show event manager policy pending [queue-type{applet | call-home | axp | script} class class-options | detailed


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy pending [queue-type{applet | call-home | axp | script} class class-options | detailed]


Example:

Device# show event manager policy pending

 

Displays the pending EEM policies.

 
Step 3
event manager scheduler hold {all| policy job-id | queue-type {applet | call-home | axp | script} class class-options} [processor {rp_primary| rp_standby}]


Example:

Device# event manager scheduler hold policy 2

 

Holds a scheduled EEM policy event or event queue in the EEM scheduler.

  • In this example, a policy with a job ID of 2 is put on hold.
 
Step 4
show event manager policy pending [queue-type{applet | call-home | axp | script} class class-options | detailed


Example:

Device# show event manager policy pending

 

Displays the status of EEM policy put on hold in Step 3 as held, along with other pending policies.

 
Examples

The following example shows how to view all pending EEM policies and to hold the EEM policy with a job ID of 2. 

Device# show event manager policy pending
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one
2   2      pend   Thu Sep 7  02:54:04 2006  syslog         applet: two
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three
Device# event manager scheduler hold policy 2
Device# show event manager policy pending
 
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one
2 	2      held   Thu Sep 7  02:54:04 2006  syslog         applet: two
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three

Resuming Execution of EEM Policy Events or Event Queues

To resume the execution of specified EEM policies, perform this task. In this task, the policy that was put on hold in the Holding a Scheduled EEM Policy Event or Event Queue task is now allowed to resume execution.

SUMMARY STEPS

1.    enable

2.    show event manager policy pending

3.    event manager scheduler release {all | policy policy-id | queue-type {applet | call-home | axp | script}} class class-options [processor {rp_primary | rp_standby}]

4.    show event manager policy pending


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays the pending and held EEM policies.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Step 3
event manager scheduler release {all | policy policy-id | queue-type {applet | call-home | axp | script}} class class-options [processor {rp_primary | rp_standby}]


Example:

Device# event manager scheduler release policy 2

 

Resumes execution of specified EEM policies.

  • The example shows how to resume the execution of the policy with job ID of 2.
 
Step 4
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays the status of the EEM policy resumed in Step 3 as pending, along with other pending policies.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Examples

The following example shows how to view all pending EEM policies, to specify the policy that will resume execution, and to see that the policy is now back in a pending status. 

Device# show event manager policy pending
 
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one
2 	2      held   Thu Sep 7  02:54:04 2006  syslog         applet: two
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three
Rotuer# event manager scheduler release policy 2
Rotuer# show event manager policy pending
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one
2   2      pend   Thu Sep 7  02:54:04 2006  syslog         applet: two
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three

Clearing Pending EEM Policy Events or Event Queues

Perform this task to clear EEM policies that are executing or pending execution. In this task, the EEM policy with a job ID of 2 is cleared from the pending queue. The show event manager policy pending command is used to display the policies that are pending before and after the policy is cleared.

SUMMARY STEPS

1.    enable

2.    show event manager policy pending

3.    event manager scheduler clear {all | policy job-id | queue-type {applet | call-home | axp | script} class class-options} [processor {rp_primary | rp_standby}]

4.    show event manager policy pending


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays the pending EEM policies.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Step 3
event manager scheduler clear {all | policy job-id | queue-type {applet | call-home | axp | script} class class-options} [processor {rp_primary | rp_standby}]


Example:

Device# event manager scheduler clear policy 2

 

Clears EEM policies that are executing or pending execution.

  • In this example, the EEM policy with a job ID of 2 is cleared from the pending queue.
 
Step 4
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays all the pending EEM policies except the policy cleared in Step 3.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Examples

The following example shows how to clear the EEM policy with a job ID of 2 that was pending execution. The show commands are used to display the policies that are pending before and after the policy is cleared. 

Device# show event manager policy pending
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one 
2   2      pend   Thu Sep 7  02:54:04 2006  syslog         applet: two 
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three 
 
Device# event manager scheduler clear policy 2
Device# show event manager policy pending
 
no. job id status time of event             event type     name
1   1      pend   Thu Sep 7  02:54:04 2006  syslog         applet: one 
3   3      pend   Thu Sep 7  02:54:04 2006  syslog         applet: three

Modifying the Scheduling Parameters of EEM Policy Events or Event Queues

To modify the scheduling parameters of the EEM policies, perform this task. The show event manager policy pending command displays policies that are assigned to the B or default class. All the currently pending policies are then changed to class A. After the configuration modification, the show event manager policy pending command shows all policies assigned as class A.

SUMMARY STEPS

1.    enable

2.    show event manager policy pending

3.    event manager scheduler modify {all | policy job-id | queue-type {applet | call-home | axp | script} | class class-options} [queue-priority {high | last | low | normal}][processor {rp_primary | rp_standby}]

4.    show event manager policy pending


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays the pending EEM policies.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Step 3
event manager scheduler modify {all | policy job-id | queue-type {applet | call-home | axp | script} | class class-options} [queue-priority {high | last | low | normal}][processor {rp_primary | rp_standby}]


Example:

Device# event manager scheduler modify all class A

 

Modifies the scheduling parameters of the EEM policies.

  • In this example, all currently pending EEM policies are assigned to class A.
 
Step 4
show event manager policy pending


Example:

Device# show event manager policy pending

 

Displays the EEM policies modified in Step 3 along with other pending policies.

Note    Only the syntax applicable to this task is used in this example. For more details, see the Cisco IOS Network Management Command Reference.
 
Examples

The following example shows how to modify the scheduling parameters of the EEM policies. In this example, the show event manager policy pending command displays policies that are assigned to the B or default class. All the currently pending policies are then changed to class A. After the configuration modification, the show event manager policy pending command verifies that all policies are now assigned as class A. 

Device# show event manager policy pending
no. class   status time of event             event type     name
1   default pend   Thu Sep 7  02:54:04 2006  syslog         applet: one 
2   default pend   Thu Sep 7  02:54:04 2006  syslog         applet: two 
3   B       pend   Thu Sep 7  02:54:04 2006  syslog         applet: three 
 
Device# event manager scheduler modify all class A
Device# show event manager policy pending
 
no. class status time of event             event type     name
1   A     pend   Thu Sep 7  02:54:04 2006  syslog         applet: one 
2   A     pend   Thu Sep 7  02:54:04 2006  syslog         applet: two 
3   A     pend   Thu Sep 7  02:54:04 2006  syslog         applet: three

Verifying Class-Based Scheduled Activities of EEM Policies

To verify the scheduled activities of the EEM policies, use the show event manager schedulercommand.

SUMMARY STEPS

1.    show event manager scheduler thread [queue-type {applet| call-home | axp | script} class class-options | detailed]


DETAILED STEPS
show event manager scheduler thread [queue-type {applet| call-home | axp | script} class class-options | detailed]

This command displays all the EEM execution threads from the scheduler perspective and the details of the running policies. This command includes detailed and queue-type optional keywords. The following is sample output from this command:



Example: 
Device# show event manager scheduler thread 
1 Script threads service class default
  total: 1 running: 1 idle: 0
2 Script threads service class range A-D
  total: 3 running: 0 idle: 3
3 Applet threads service class default
  total: 32 running: 0 idle: 32
4 Applet threads service class W X
  total: 5 running: 0 idle: 5

To display the details of the running policies using the scheduler threads use the detailed keyword. The following is sample output for this keyword:



Example: 
Device# show event manager scheduler thread detailed
 
1 Script threads service class default
total: 5 running: 5 idle: 0
1 job id: 12341, pid: 101, name: loop.tcl
2 job id: 12352, pid: 52, name: loop.tcl
3 job id: 12363, pid: 55, name: loop.tcl
4 job id: 12395, pid: 53, name: loop.tcl
5 job id: 12588, pid: 102, name: loop.tcl
2 Applet threads service class default
total: 32 running: 5 idle: 27
1 job id: 15585, pid: 104, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
2 job id: 15586, pid: 105, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
3 job id: 15587, pid: 106, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
4 job id: 15589, pid: 107, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
5 job id: 15590, pid: 80, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL

To display the scheduler threads of a queue-type use the queue-type keyword. The following are the sample output for this keyword:



Example: 
Device# show event manager sched thread queue-type applet
1 Applet threads service class default
total: 32 running: 7 idle: 25
Device# show event manager sched thread queue-type applet detailed
1 Applet threads service class default
total: 32 running: 5 idle: 27
1 job id: 15700, pid: 103, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
2 job id: 15701, pid: 104, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
3 job id: 15703, pid: 106, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
4 job id: 15704, pid: 107, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL
5 job id: 15706, pid: 55, name: WDOG_SYSLG_CNTR_TRACK_INTF_APPL

Verifying Class-Based Active EEM Policies

To verify the active or the running EEM policies, use the show event manager policy active command.

SUMMARY STEPS

1.    show event manager policy active [queue-type {applet| call-home | axp | script} class class-options | detailed]


DETAILED STEPS
show event manager policy active [queue-type {applet| call-home | axp | script} class class-options | detailed]

This command displays only the running EEM policies. This command includes class, detailed and queue-type optional keywords. The following is sample output from this command:



Example: 
Device# show event manager policy active
no. job id p s status time of event event type name
1 12598 N A running Mon Oct29 20:49:37 2007 timer watchdog loop.tcl
2 12609 N A running Mon Oct29 20:49:42 2007 timer watchdog loop.tcl
3 12620 N A running Mon Oct29 20:49:46 2007 timer watchdog loop.tcl
4 12650 N A running Mon Oct29 20:49:59 2007 timer watchdog loop.tcl
5 12842 N A running Mon Oct29 20:51:13 2007 timer watchdog loop.tcl
default class - 6 applet events
no. job id p s status time of event event type name
1 15852 N A running Mon Oct29 21:11:09 2007 counter WDOG_SYSLG_CNTR_TRACK_INTF_APPL
2 15853 N A running Mon Oct29 21:11:09 2007 counter WDOG_SYSLG_CNTR_TRACK_INTF_APPL
3 15854 N A running Mon Oct29 21:11:10 2007 counter WDOG_SYSLG_CNTR_TRACK_INTF_APPL
4 15855 N A running Mon Oct29 21:11:10 2007 timer watchdog WDOG_SYSLG_CNTR_TRACK_INTF_APPL
5 15856 N A running Mon Oct29 21:11:11 2007 counter WDOG_SYSLG_CNTR_TRACK_INTF_APPL
6 15858 N A running Mon Oct29 21:11:11 2007 counter WDOG_SYSLG_CNTR_TRACK_INTF_APPL

Verifying Pending EEM Policies

To verify the EEM policies that are pending for execution, use the show event manager policy pending command. Use the optional keywords to specify EEM class-based scheduling options.

SUMMARY STEPS

1.    show event manager policy pending [queue-type {applet| call-home | axp | script} class class-options | detailed]


DETAILED STEPS
show event manager policy pending [queue-type {applet| call-home | axp | script} class class-options | detailed]

This command displays only the pending policies. This command includes class, detailed and queue-type optional keywords. The following is sample output from this command:



Example: 
Device# show event manager policy pending
no. job id p s status time of event event type name
1    12851   N A    pend    Mon Oct29   20:51:18 2007   timer watchdog   loop.tcl
2    12868   N A    pend    Mon Oct29   20:51:24 2007   timer watchdog   loop.tcl
3    12873   N A    pend    Mon Oct29   20:51:27 2007   timer watchdog   loop.tcl
4    12907   N A    pend    Mon Oct29   20:51:41 2007   timer watchdog   loop.tcl
5    13100   N A    pend    Mon Oct29   20:52:55 2007   timer watchdog   loop.tcl

Configuring EEM Applet (Interactive CLI) Support

The synchronous applets are enhanced to support interaction with the local console (tty) using two commands, action gets and action puts, and these commands allow users to enter and display input directly on the console. The output for synchronous applets will bypass the system logger. The local console will be opened by the applets and serviced by the corresponding synchronous Event Detector pty. Synchronous output will be directed to the opened console.

Reading and Writing Input from the Active Console for Synchronous EEM Applets

Use the following tasks to implement EEM applet interactive CLI support:

Reading Input from the Active Console

When a synchronous policy is triggered, the related console is stored in the publish information specification. The policy director will query this information in an event_reqinfo call, and store the given console information for use by the action gets command.

The action gets command reads a line of the input from the active console and stores the input in the variable. The trailing new line will not be returned.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event none

5.    action label gets variable

6.    action label syslog [priority priority-level msg msg-text

7.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet action

 

Registers the applet with the EEM and enters applet configuration mode.

 
Step 4
event none


Example:

Device(config-applet)# event none

 

Specifies that an EEM policy is to be registered with the EEM and can be run manually.

 
Step 5
action label gets variable


Example:

Device(config-applet)# action label2 gets input

 

Gets input from the local console in a synchronous applet and stores the value in the given variable when an EEM applet is triggered.

 
Step 6
action label syslog [priority priority-level msg msg-text


Example:

Device(config-applet)# action label3 syslog msg "Input entered was \"$input\""

 

Specifies the action to be taken when an EEM applet is triggered.

  • In this example, the action to be taken is to write the value of the variable specified in Step 5, to syslog.
 
Step 7
exit


Example:

Device(config-applet)# exit

 

Exits applet configuration mode and returns to privileged EXEC mode.

 
Example

The following example shows how to get the input from the local tty in a synchronous applet and store the value 

Device(config)# event manager applet action
Device(config-applet)# event none
Device(config-applet)# action label2 gets input

Device(config-applet)# action label3 syslog msg "Input entered was \"$input\""

Writing Input to the Active Console

When a synchronous policy is triggered, the related console is stored in the publish information specification. The policy director will query this information in an event_reqinfo call, and store the given console information for use by the action puts command.

The action puts command will write the string to the active console. A new line will be displayed unless the nonewline keyword is specified. The output from the action puts command for a synchronous applet is displayed directly to the console, bypassing the system logger. The output of the action puts command for an asynchronous applet is directed to the system logger.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event none

5.    action label regexp string-pattern string-input [string-match [string-submatch1] [string-submatch2] [string-submatch3]]

6.    action label puts [nonewline] string

7.    exit

8.    event manager run applet-name


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet action

 

Registers the applet with the EEM and enters applet configuration mode.

 
Step 4
event none


Example:

Device(config-applet)# event none

 

Specifies that an EEM policy is to be registered with the EEM and can be run manually.

 
Step 5
action label regexp string-pattern string-input [string-match [string-submatch1] [string-submatch2] [string-submatch3]]


Example:

Device(config-applet)# action 1 regexp "(.*) (.*) (.*)" "one two three" _match _sub1

 

Specifies the action to match the regular expression pattern on an input string when an EEM applet is triggered.

 
Step 6
action label puts [nonewline] string


Example:

Device(config-applet)# action 2 puts "match is $_match"

 

Specifies the action of printing data directly to the local console when an EEM applet is triggered.

  • The nonewline keyword is optional and is used to suppress the display of the new line character.
 
Step 7
exit


Example:

Device(config-applet)# exit

 

Exits applet configuration mode and returns to privileged EXEC mode.

 
Step 8
event manager run applet-name


Example:

Device# event manager run action

 

Manually runs a registered EEM policy.

  • In this example, the policy registered in Step 3 is triggered and the associated actions specified in Step 5 and Step 6 are executed.
 
Example

The following example shows how the action puts command prints data directly to the local console: 

Device(config-applet)# event manager applet puts
Device(config-applet)# event none
Device(config-applet)# action 1 regexp "(.*) (.*) (.*)" "one two three" _match _sub1
Device(config-applet)# action 2 puts "match is $_match"
Device(config-applet)# action 3 puts "submatch 1 is $_sub1"
Device# event manager run puts
match is one two three
submatch 1 is one

Configuring SNMP Library Extensions

Depending on your release, the SNMP Library Extensions feature allows you to perform the following configurations.

Prerequisites

To use this feature, you must be running Cisco IOS Release 12.4(22)T or a later release.

SNMP Get and Set Operations

The SNMP Library Extensions feature extends the EEM applet action info and Tcl sys_reqinfo_snmpcommands to include functionality for SNMP get-one, get-next, getid and set-any operations.

SNMP Get Operation

The SNMP event manager performs the SNMP get operation to retrieve one or more variables for the managed objects. Using the action info type snmp oid get-typeand action info type snmp getidcommands, you can configure the SNMP event manager to send an SNMP get request by specifying the variables to retrieve, and the IP address of the agent.

For example, if you want to retrieve the variable with the OID value of 1.3.6.1.2.1.1.1, you should specify the variable value, that is 1.3.6.1.2.1.1.1. If the specified values do not match, a trap will be generated and an error message will be written to the syslog history.

The action info type snmp oid get-type command specifies the type of the get operation to be performed. To retrieve the exact variable, the get operation type should be specified as exact. To retrieve a lexicographical successor of the specified OID value, the get operation type should be set to next.

The table below shows the built-in variables, in which the values retrieved from SNMP get operation are stored.

Table 3Built-in Variables for action info type snmp oid Command

Built-in Variable

Description

_info_snmp_oid

The SNMP object ID.

_info_snmp_value

The value string of the associated SNMP data element.

GetID Operation

The action info type snmp getid command retrieves the following variables from the SNMP entity:

  • sysDescr.0
  • sysObjectID.0
  • sysUpTime.0
  • sysContact.0
  • sysName.0
  • sysLocation.0

The table below shows the built-in variables, in which the values retrieved from the SNMP getID operation are stored.

Table 4Built-in Variables for action info type snmp getid Command

Built-in Variable

Description

_info_snmp_syslocation_oid

The OID value of the sysLocation variable.

_info_snmp_syslocation_value

The value string for the sysLocation variable.

_info_snmp_sysdescr_oid

The OID value of the sysDescr variable.

_info_snmp_sysdescr_value

The value string for the sysDescr variable.

_info_snmp_sysobjectid_oid

The OID value of the sysObjectID variable.

_info_snmp_sysobjectid_value

The value string for the sysObjectID variable.

_info_snmp_sysuptime_oid

The OID value of the sysUptime variable.

_info_snmp_sysuptime_value

The value string for the sysUptime variable.

_info_snmp_syscontact_oid

The OID value of the sysContact variable.

_info_snmp_syscontact_value

The value string for the sysContact variable.

The get operation requests can be sent to both local and remote hosts.

SNMP Set Operation

All SNMP variables are assigned a default value in the MIB view. The SNMP event manager can modify the value of these MIB variables through set operation. The set operation can be performed only on the system that allows read-write access.

To perform a set operation, you must specify the type of the variable and the value associated with it.

The table below shows the valid OID types and values for each OID type.

Table 5OID Type and Value for Set Operation

OID Type

Description

counter32

A 32-bit number with a minimum value of 0. When the maximum value is reached, the counter resets to 0. Integer value in the range from 0 to 4294967295 is valid.

gauge

A 32-bit number with a minimum value of 0. For example, the interface speed on a device is measured using a gauge object type. Integer value in the range from 0 to 4294967295 is valid.

integer

A 32-bit number used to specify a numbered type within the context of a managed object. For example, to set the operational status of a device interface, 1 represents up and 2 represents down. Integer value in the range from 0 to 4294967295 is valid.

ipv4

IP version 4 address. IPv4 address in dotted decimal notation is valid.

octet string

An octet string in hexadecimal notation used to represent physical addresses. Text strings are valid.

string

An octet string in text notation used to represent text strings. Text strings are valid.

unsigned32

A 32-bit number used to represent decimal value.Unsigned integer value in the range from 0 to 4294967295 is valid.

The set operation can carried out on both local and remote hosts.

SNMP Traps and Inform Requests

Traps are SNMP notifications that alert the SNMP manager or the NMS to a network condition.

SNMP inform requests refer to the SNMP notifications that alert the SNMP manager to a network condition and request for confirmation of receipt from the SNMP manager.

An SNMP event occurs when SNMP MIB object ID values are sampled, or when the SNMP counter crosses a defined threshold. If the notifications are enabled and configured for such events, the SNMP traps or inform messages generated. An SNMP notification event is triggered when an SNMP trap or inform message is received by the event manager server.

To send an SNMP trap or inform message when an Embedded Event Manager (EEM) applet is triggered, the action info type snmp trap and action info type snmp informcommands are used. The CISCO-EMBEDDED-EVENT-MGR-MIB.my is used to define the trap and inform messages.

Configuring EEM Applet for SNMP Get and Set Operations

While registering a policy with the event manager server, the actions associated with an SNMP event can be configured.

Perform this task to configure EEM applet for SNMP set and get operations.

Before You Begin
  • SNMP event manager must be configured using the snmp-server managercommand.
  • The SNMP community string should be set by using the snmp-server community command to enable access to the SNMP entity.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.   Do one of the following:

  • event snmp oid oid-value get-type {exact | next} entry-op operator entry-val entry-value[exit-comb | and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value

5.    action label info type snmp oid oid-value get-type {exact| next} [community community-string] [ipaddr ip-address]

6.    action label info type snmp oid oid-value set-type oid-type oid-type-value community community-string [ipaddr ip-address]

7.    action label info type snmp getid oid-value [community community-string] [ipaddr ip-address]

8.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet snmp

 

Registers the applet with the event manager server and enters applet configuration mode.

 
Step 4
Do one of the following:
  • event snmp oid oid-value get-type {exact | next} entry-op operator entry-val entry-value[exit-comb | and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value


Example:

Device(config-applet)# event snmp oid



Example:

1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact



Example:

entry-op lt entry-val 5120000 poll-interval 90

 

Specifies the event criteria that cause the EEM applet to run.

  • In this example, an EEM event is triggered when free memory falls below the value of 5120000.
  • Exit criteria are optional, and if not specified, event monitoring is reenabled immediately.
 
Step 5
action label info type snmp oid oid-value get-type {exact| next} [community community-string] [ipaddr ip-address]


Example:

Device(config-applet)# action 1.3 info type



Example:

snmp oid 1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type



Example:

exact community public ipaddr 172.17.16.69

 

Specifies the type of get operation to perform.

  • In this example, the type of get operation is specified as exact and community string is specified as public.
 
Step 6
action label info type snmp oid oid-value set-type oid-type oid-type-value community community-string [ipaddr ip-address]


Example:

Device(config-applet)# action 1.4 info type



Example:

snmp oid 1.3.6.1.4.1.9.9.48.1.1.1.6.1 set-type



Example:

integer 42220 sysName.0 community rw ipaddr



Example:

172.17.16.69

 

(Optional) Specifies the variable to be set.

  • In this example, the sysName.0 variable is specified for the set operation and community string is specified as rw.
Note    For set operation, you must specify the SNMP community string.
 
Step 7
action label info type snmp getid oid-value [community community-string] [ipaddr ip-address]


Example:

Device(config-applet)# action 1.3 info type



Example:

snmp getid community public ipaddr 172.17.16.69

 

(Optional) Specifies if the individual variables should be retrieved by the getid operation.

 
Step 8
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Configuring EEM Applet for SNMP OID Notifications

Perform this task to configure SNMP notifications.

Before You Begin
  • SNMP event manager must be configured using the snmp-server managercommand and SNMP agents must be configured to send and receive SNMP traps generated for an EEM policy.
  • SNMP traps and informs must be enabled by using the snmp-server enable traps event-manager and snmp-server enable traps commands, to allow traps and inform requests to be sent from the device to the event manager server.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.   Do one of the following:

  • event snmp oid oid-value get-type {exact | next} entry-op operator entry-val entry-value[exit-comb | and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value

5.    action label info type snmp var variable-name oid oid-value oid-type oid-type-value

6.    action label info type snmp trap enterprise-oid enterprise-oid-value generic-trapnum generic-trap-number specific-trapnum specific-trap-number trap-oid trap-oid-value trap-var trap-variable

7.    action label info type snmp inform trap-oid trap-oid-value trap-var trap-variable community community-string ipaddr ip-address

8.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet snmp

 

Registers the applet with the event manager server and enters applet configuration mode.

 
Step 4
Do one of the following:
  • event snmp oid oid-value get-type {exact | next} entry-op operator entry-val entry-value[exit-comb | and}] [exit-op operator] [exit-val exit-value] [exit-time exit-time-value] poll-interval poll-int-value


Example:

Device(config-applet)# event snmp oid



Example:

1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact



Example:

entry-op lt entry-val 5120000 poll-interval 90

 

Specifies the event criteria that cause the EEM applet to run.

  • In this example, an EEM event is triggered when free memory falls below the value of 5120000.
  • Exit criteria are optional, and if not specified, event monitoring is reenabled immediately.
 
Step 5
action label info type snmp var variable-name oid oid-value oid-type oid-type-value


Example:

Device(config-applet)# action 1.3 info type



Example:

snmp var sysDescr.0 oid



Example:

1.3.6.1.4.1.9.9.48.1.1.1.6.1 integer 4220

 

Specifies the instance of a managed object and its value.

  • In this example, the sysDescr.0 variable is used.
 
Step 6
action label info type snmp trap enterprise-oid enterprise-oid-value generic-trapnum generic-trap-number specific-trapnum specific-trap-number trap-oid trap-oid-value trap-var trap-variable


Example:

Device(config-applet)# action 1.4 info type



Example:

snmp trap enterprise-oid 1.3.6.1.4.1.1



Example:

generic-trapnum 4 specific-trapnum 7 trap-oid



Example:

1.3.6.1.4.1.1.226.0.2.1 trap-var sysUpTime.0

 

Generates an SNMP trap when the EEM applet is triggered.

  • In this example, the authenticationFailure trap is generated.
Note    The specific trap number refers to the enterprise-specific trap, which is generated when an enterprise event occurs. If the generic trap number is not set to 6, the specific trap number you specify will be used to generate traps.
 
Step 7
action label info type snmp inform trap-oid trap-oid-value trap-var trap-variable community community-string ipaddr ip-address


Example:

Device(config-applet)# action 1.4 info type



Example:

snmp inform trap-oid 1.3.6.1.4.1.1.226.0.2.1



Example:

trap-var sysUpTime.0 community public ipaddr



Example:

172.69.16.2

 

Generates an SNMP inform request when the EEM applet is triggered.

  • In this example, the inform request is generated for the sysUpTime.0 variable.
 
Step 8
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged mode.

 

Configuring Variable Logic for EEM Applets

The Variable Logic for EEM Applets feature adds the ability to apply conditional logic within EEM applets. Before variable logic is introduced, applets have a linear structure where each action is executed in the order in which they are configured when the event is triggered. Conditional logic introduces a control structure that can change the flow of actions within applets depending on conditional expressions. Each control structure can contain a list of applet actions including looping and if/else actions which determine if the structure is executed or not.

The information in applet configuration mode is presented as background to set the context for the action commands.

To provide a consistent user interface between the Tool Command Language (Tcl) and the applet (CLI) based EEM policies, the following criteria are followed:

  • Event specification criteria are written in Tcl in the Tcl based implementation.
  • Event specification data is written using the CLI applet submode configuration statements in the applet-based implementation.

Applet configuration mode is entered using the event manager applet command. In applet configuration mode the config prompt changes to (config-applet)#. In applet configuration mode two types of config statements are supported:

  • event - used to specify the event criteria to cause this applet to run.
  • action - used to specify a built-in action to perform.

Multiple action applet config commands are allowed within an applet configuration. If no action applet config command is present, a warning is displayed, upon exit, stating no statements are associated with this applet. When no statements are associated with this applet, events get triggered but no action is taken. If no commands are specified in applet configuration mode, the applet will be removed upon exit. The exit applet config command is used to exit from applet configuration mode.

Depending on your release, the Variable Logic for EEM Applets feature allows you to perform the following configurations.

Prerequisites

To use this feature, you must be running Cisco IOS Release 12.4(22)T or a later release.

Configuring Variable Logic for EEM Applets

EEM 3.0 adds new applet action commands to permit simple variable logic within applets.

To configure the variable logic using action commands perform the following tasks.

Specifying a Loop of Conditional Blocks

To specify a loop of a conditional block when an EEM applet is triggered, perform this task. In this task, a conditional loop is set to check if the value of the variable is less than 10. If the value of the variable is less than 10, then the message 'i is $_i' is written to the syslog.


Note
Depending on your release, the set (EEM) command is replaced by the action set command. See the action label set command for more information. If the set (EEM) command is entered in certain releases, the IOS parser translates the set command to the action label set command.
SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    action label set

5.    action label while string_op1 operator string_op2

6.    Add any action as required.

7.    action label end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet condition

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
action label set


Example:

Device(config-applet)#action 1.0 set i 2

 

Sets an action for the event.

  • In this example, the value of the variable i is set to 2.
 
Step 5
action label while string_op1 operator string_op2


Example:

Device(config-applet)# action 2 while $i lt 10

 

Specifies a loop of a conditional block.

  • In this example, a loop is set to check if the value of the variable i is less than 10.
 
Step 6
Add any action as required.

Example:

Device(config-applet)# action 3 action syslog msg "i is $i"

 

Performs the action as indicated by the action command.

  • In this example, the message 'i is $_i' is written to the syslog.
 
Step 7
action label end


Example:

Device(config-applet)# action 3 end

 

Exits from the running action.

 

Specifying if else Conditional Blocks

To specify the beginning of an if conditional statement followed by an else conditional statement, perform this task. The if or else conditional statements can be used in conjunction with each other or separately. In this task, the value of a variable is set to 5. An if conditional block is then specified to check if the value of the variable is less than 10. Provided the if conditional block is satisfied, an action command to output the message 'x is less than 10' is specified.

Following the if conditional block, an else conditional block is specified. Provided the if conditional block is not satisfied, an action command to output the message 'x is greater than 10' is specified.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    action label set variable-name variable-value

5.    action label if [stringop1] {eq | gt | ge | lt | le | ne} [stringop2]

6.    Add any action as required.

7.    action label else

8.    Add any action as required.

9.    end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet ifcondition

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
action label set variable-name variable-value


Example:

Device(config-applet)# action 1.0 set x 5

 

Sets an action for the event.

  • In this example, the value of the variable x is set to 5.
 
Step 5
action label if [stringop1] {eq | gt | ge | lt | le | ne} [stringop2]


Example:

Device(config-applet)# action 2.0 if $x lt 10

 

Specifies an if conditional statement.

  • In this example, an if conditional statement to check if the value of the variable is less than 10.
 
Step 6
Add any action as required.

Example:

Device(config-applet)# action 3.0 puts "$x is less than 10"

 

Performs the action as indicated by the action command.

  • In this example, the message '5 is less than 10' is displayed on the screen.
 
Step 7
action label else


Example:

Device(config-applet)# action 4.0 else

 

Specifies an else conditional statement

 
Step 8
Add any action as required.

Example:

Device(config-applet)# action 5.0

 

Performs the action as indicated by the action command.

  • In this example, the message '5 is greater than 10' is displayed on the screen.
 
Step 9
end


Example:

Device(config-applet)# end

 

Exits from the running action.

 

Specifying foreach Iterating Statements

To specify a conditional statement that iterates over an input string using the delimiter as a tokenizing pattern, perform this task. The foreach iteration statement is used to iterate through a collection to get the desired information. The delimiter is a regular expression pattern string. The token found in each iteration is assigned to the given iterator variable. All arithmetic calculations are performed as long integers with out any checks for overflow. In this task, the value of the variable x is set to 5. An iteration statement is set to run through the input string red, blue, green, orange. For every element in the input string, a corresponding message is displayed on the screen.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    action label foreach [string-iterator] [string-input] [string-delimiter]

5.    Specify any action command

6.    action label end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet iteration

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
action label foreach [string-iterator] [string-input] [string-delimiter]


Example:

Device(config-applet)# action 2.0 foreach iterator "red blue green orange"

 

Iterates over an input string using the delimter as a tokenizing pattern.

  • In this example, the iteration is run through the elements of the input string - red, blue, green and orange.
 
Step 5
Specify any action command

Example:

Device(config-applet)# action 3.0 puts "Iterator is $iterator"

 

Performs the action as indicated by the action command.

  • In this example, the following message is displayed on the screen:

Iterator is red

Iterator is blue

Iterator is green

Iterator is orange

 
Step 6
action label end


Example:

Device(config-applet)# action 4.0 end

 

Exits from the running action.

 

Using Regular Expressions

To match a regular expression pattern with an input string, perform this task. Using regular expressions, you can specify the rules for a set of possible strings to be matched.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    action label regexp string-pattern string-input [string-match [string-submatch1] [string-submatch2] [string-submatch3]]


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet regexp

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
action label regexp string-pattern string-input [string-match [string-submatch1] [string-submatch2] [string-submatch3]]


Example:

Device(config-applet)# action 2.0 regexp "(.*) (.*) (.*)" "red blue green" _match _sub1

 

Specifies an expression pattern to match with an input string.

  • In this example, an input string of 'red blue green' is specified. When the expression pattern matches the input string, the entire result red blue green is stored in the variable _match and the submatch redis stored in the variable _sub1.
 

Incrementing the Values of Variables

To increment the value of variables, perform this task. In this task, the value of a variable is set to 20 and then the value is incremented by 12.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    action label set

5.    action label increment variable-name long-integer


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet increment

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
action label set


Example:

Device(config-applet)#action 1.0 set varname 20

 

Sets an action for the event.

  • In this example, the value of the variable is set to 20.
 
Step 5
action label increment variable-name long-integer


Example:

Device(config-applet)#action 2.0 increment varname 12

 

Increments the value of variable by the specified long integer.

  • In this example, the value of the variable is incremented by 12.
 

Configuring Event SNMP Object

Perform this task to register the Simple Network Management Protocol (SNMP) object event for an Embedded Event Manager (EEM) applet that is run by sampling SNMP object.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    event snmp-object oid oid-value type value sync {yes | no} skip {yes | no} istable {yes | no} [default seconds] [maxrun maxruntime-number]

5.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet manual-policy

 

Registers the applet with the Embedded Event Manager and enters applet configuration mode.

 
Step 4
event snmp-object oid oid-value type value sync {yes | no} skip {yes | no} istable {yes | no} [default seconds] [maxrun maxruntime-number]


Example:

Device(config-applet)# event snmp-object oid 1.9.9.9.9 type gauge sync yes



Example:

action 1 syslog msg "oid = $_snmp_oid"



Example:

action 2 syslog msg "request = $_snmp_request"



Example:

action 3 syslog msg "request_type = $_snmp_request_type"

 

Registers the Simple Network Management Protocol (SNMP) object event for an Embedded Event Manager (EEM) applet to intercept SNMP GET and SET requests for an object.

The default for this command is that it is not configured. If this command is configured the defaults are the same as in the description of the syntax options,

  • The oidkeyword specifies the SNMP object identifier (object ID).
  • The oid-value argument can be the Object ID value of the data element, in SNMP dotted notation. An OID is defined as a type in the associated MIB, CISCO-EMBEDDED-EVENT-MGR-MIB, and each type has an object value.
  • The istable keyword specifies whether the OID is an SNMP table.
  • The sync keyword specifies that the applet is to run in synchronous mode. The return code from the applet indicates whether to reply to the SNMP request. The description for code 0 is "do not reply to the request" and the description for code 1 is "reply to the request". When the return code from the applet replies to the request, a value is specified in the applet for the object using action snmp-object-value command.
  • The typekeyword specifies the type of object.
  • The value argument is the value of the object.
  • Theskip keyword specifies whether to skip CLI command execution.
  • The default keyword specifies the time to process the SET or GET request normally by the applet. If the default keyword is not specified, the default time period is set to 30 seconds.
  • The milliseconds argument is the time period during which the SNMP Object event detector waits for the policy to exit.
  • The maxrun keyword specifies the maximum runtime of the applet. If the maxrun keyword is specified, the maxruntime-number value must be specified. If the maxrun keyword is not specified, the default applet run time is 20 seconds.
  • The milliseconds argument is the maximum runtime of the apple in milliseconds. If the argument is not specified, the default 20-second run-time limit is used.
 
Step 5
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Disabling AAA Authorization

Perform this task to allow EEM policies to bypass AAA authorization when triggered.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name [authorization bypass] [class class-options] [trap]

4.    exit


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name [authorization bypass] [class class-options] [trap]


Example:

Device(config-applet)# event manager applet one class A authorization bypass

 

Registers the applet with the Embedded Event Manager (EEM) and enters applet configuration mode.

 
Step 4
exit


Example:

Device(config)# exit

 

Exits global configuration mode and returns to privileged EXEC mode.

 

Configuring Description of an Embedded Event Manager Applet

Perform this task to describe an EEM applet. The description of an applet can be added in any order, before or after any other applet configuration. Configuring a new description for an applet that already has a description overwrites the current description. An applet description is optional.

Perform this task to configure a new description for an applet.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    event manager applet applet-name

4.    description line

5.    event syslog pattern regular-expression

6.    action label syslog msg msg-text

7.    end


DETAILED STEPS
 Command or ActionPurpose
Step 1
enable


Example:

Device> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Device# configure terminal

 

Enters global configuration mode.

 
Step 3
event manager applet applet-name


Example:

Device(config)# event manager applet increment

 

Registers the applet with the EEM and enters applet configuration mode.

 
Step 4
description line


Example:

Device(config-applet)# description "This applet looks for the word count in syslog messages"

 

Adds or modifies the description of an EEM applet that is run by sampling Simple Network Management Protocol (SNMP).

 
Step 5
event syslog pattern regular-expression


Example:

Device(config-applet)# event syslog pattern "count"

 

Specifies the event criteria for an Embedded Event Manager (EEM) applet that is run by matching syslog messages.

 
Step 6
action label syslog msg msg-text


Example:

Device(config-applet)# action 1 syslog msg hi

 

Specifies the action to be taken when an EEM applet is triggered.

  • In this example, the action taken is to write a message to syslog.
  • The msg-text argument can be character text, an environment variable, or a combination of the two.
 
Step 7
end


Example:

Device(config-applet)# end

 

Exits applet configuration mode and returns to privileged EXEC mode.

 

Configuration Examples for Writing EEM Policies Using the Cisco IOS CLI

Embedded Event Manager Applet Configuration Examples

The following examples show how to create an EEM applet for some of the EEM event detectors. These examples follow steps outlined in the Registering and Defining an Embedded Event Manager Applet.

Application-Specific Event Detector

The following example shows how a policy named EventPublish_A runs every 20 seconds and publishes an event type numbered 1 to an EEM subsystem numbered 798. The subsystem value of 798 specifies that a publish event has occurred from an EEM policy. A second policy named EventPublish_B is registered to run when the EEM event type 1 occurs with subsystem 798. When the EventPublish_B policy runs, it sends a message to syslog containing data passed as an argument from the EventPublish_A policy. 

event manager applet EventPublish_A
 event timer watchdog time 20.0
 action 1.0 syslog msg "Applet EventPublish_A"
 action 2.0 publish-event sub-system 798 type 1 arg1 twenty
 exit
event manager applet EventPublish_B
 event application sub-system 798 type 1
 action 1.0 syslog msg "Applet EventPublish_B arg1 $_application_data1"

CLI Event Detector

The following example shows how to specify an EEM applet to run when the Cisco IOS write memory CLI command is run. The applet provides a notification that this event has occurred via a syslog message. In the example, the sync keyword is configured with the yes argument, and this means that the event detector is notified when this policy completes running. The exit status of the policy determines whether the CLI command will be executed. In this example, the policy exit status is set to one and the CLI command runs. 

event manager applet cli-match
 event cli pattern "write mem.*" sync yes
 action 1.0 syslog msg "$_cli_msg Command Executed"
 set 2.0 _exit_status 1

The following example shows an applet which matches the cli pattern with the test argument. When show access-list test is entered, the CLI event detector matches the test argument, and the applet is triggered. The debug event manager detector cli output is added to show num_matches is set to one. 

!
event manager applet EEM-PIPE-TEST 
 event cli pattern "test" sync yes
 action 1.0 syslog msg "Pattern matched!"
!
*Aug 23 23:19:59.827: check_eem_cli_policy_handler: command_string=show access-lists test
*Aug 23 23:19:59.827: check_eem_cli_policy_handler: num_matches = 1, response_code = 4
*Aug 23 23:19:59.843: %HA_EM-6-LOG: EEM-PIPE-TEST: Pattern matched!

Note
The functionality provided in the CLI event detector only allows a regular expression pattern match on a valid IOS CLI command itself. This does not include text after a pipe (|) character when redirection is used.

The following example shows that when show version | include test is entered, the applet fails to trigger because the CLI event detector does not match on characters entered after the pipe (|) character and the debug event manager detector cli output shows num_matches is set to zero. 

*Aug 23 23:20:16.827: check_eem_cli_policy_handler: command_string=show version
*Aug 23 23:20:16.827: check_eem_cli_policy_handler: num_matches = 0, response_code = 1

Counter Event Detector and Timer Event Detector

The following example shows that the EventCounter_A policy is configured to run once a minute and to increment a well-known counter called critical_errors. A second policy--EventCounter_B--is registered to be triggered when the well-known counter called critical_errors exceeds a threshold of 3. When the EventCounter_B policy runs, it resets the counter to 0. 

event manager applet EventCounter_A
 event timer watchdog time 60.0
 action 1.0 syslog msg "EventCounter_A"
 action 2.0 counter name critical_errors op inc value 1
 exit
event manager applet EventCounter_B
 event counter name critical_errors entry-op gt entry-val 3 exit-op lt exit-val 3
 action 1.0 syslog msg "EventCounter_B"
 action 2.0 counter name critical_errors op set value 0

Interface Counter Event Detector

The following example shows how a policy named EventInterface is triggered every time the receive_throttle counter for Fast Ethernet interface 0/0 is incremented by 5. The polling interval to check the counter is specified to run once every 90 seconds. 

event manager applet EventInterface
 event interface name FastEthernet0/0 parameter receive_throttle entry-op ge entry-val 5
 entry-val-is-increment true poll-interval 90
 action 1.0 syslog msg "Applet EventInterface"

Resource Event Detector

The following example shows how to specify event criteria based on an ERM event report for a policy defined to report high CPU usage: 

event manager applet policy-one
 event resource policy cpu-high
 action 1.0 syslog msg "CPU high at $_resource_current_value percent"

RF Event Detector

The RF event detector is only available on networking devices that contain dual Route Processors (RPs). The following example shows how to specify event criteria based on an RF state change notification: 

event manager applet start-rf
 event rf event rf_prog_initialization
 action 1.0 syslog msg "rf state rf_prog_initialization reached"

RPC Event Detector

The RPC event detector allows an outside entity to make a Simple Object Access Protocol (SOAP) request to the device and invokes a defined EEM policy or script. The following example shows how an EEM applet called Event_RPC is being registered to run an EEM script: 

event manager applet Event_RPC 
 event rpc
 action print puts "hello there"

The following example shows the format of the SOAP request and reply message: 

<?xml version="1.0" encoding="UTF-8"?>
<SOAP:Envelope xmlns:SOAP="http://www.cisco.com/eem.xsd">
  <SOAP:Body>
    <run_eemscript>
      <script_name>Event_RPC</script_name>
    </run_eemscript>
  </SOAP:Body>
</SOAP:Envelope>
]]>]]>
<?xml version="1.0" encoding="UTF-8"?><SOAP:Envelope xmlns:SOAP="http://www.cisco.com/eem.xsd"><SOAP:Body><run_eemscript_response><return_code>0</return_code><output></output></run_eemscript_response></SOAP:Body></SOAP:Envelope>]]>]]>

SNMP Event Detector

The following example shows how to specify an EEM applet to run when the CPU usage is greater than 75 percent. When the EEM applet runs, the CLI commands enable and show cpu processes are run, and an e-mail containing the result of the show cpu processes command is sent to an engineer. 

event manager applet snmpcpuge75
 event snmp oid 1.3.6.1.4.1.9.9.109.1.1.1.1.3.1 get-type exact entry-op ge entry-val 75
poll-interval 10
 action 1.0 cli command "enable"
 action 2.0 cli command "show process cpu"
 action 3.0 mail server "192.168.1.146" to "engineer@cisco.com" from "devtest@cisco.com"
subject "B25 PBX Alert" body "$_cli_result"

The next example is more complex and shows how to configure an EEM applet that causes a switch to the secondary (redundant) Route Processor (RP) when the primary RP runs low on memory.

This example illustrates a method for taking preventative action against a software fault that causes a memory leak. The action taken here is designed to reduce downtime by switching over to a redundant RP when a possible memory leak is detected.

The figure below shows a dual RP device that is running an EEM image. An EEM applet has been registered through the CLI using the event manager applet command. The applet will run when the available memory on the primary RP falls below the specified threshold of 5,120,000 bytes. The applet actions are to write a message to syslog that indicates the number of bytes of memory available and to switch to the secondary RP.

Figure 1Dual RP Topology


The commands used to register the policy are shown below. 

event manager applet memory-demo
 event snmp oid 1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact entry-op lt entry-val 5120000
poll-interval 90
 action 1.0 syslog priority critical msg "Memory exhausted; current available memory is
$_snmp_oid_val bytes"
 action 2.0 force-switchover

The registered applet is displayed using the show event manager policy registered command: 

Device# show event manager policy registered
No.  Type    Event Type          Time Registered           Name
1    applet  snmp                Thu Jan30  05:57:16 2003  memory-demo
 oid {1.3.6.1.4.1.9.9.48.1.1.1.6.1} get-type exact entry-op lt entry-val {5120000}
poll-interval 90
 action 1.0 syslog priority critical msg "Memory exhausted; current available memory is
$_snmp_oid_val bytes"
 action 2.0 force-switchover

For the purpose of this example, a memory depletion is forced on the device, and a series of show memory commands are executed to watch the memory deplete: 

Device# show memory
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   53585260   212348444   119523060    92825384    92825384    92365916
Fast        53565260      131080       70360       60720       60720       60668
Device# show memory
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   53585260   212364664   164509492    47855172    47855172    47169340
Fast        53565260      131080       70360       60720       60720       60668
Device# show memory
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   53585260   212369492   179488300    32881192    32881192    32127556
Fast        53565260      131080       70360       60720       60720       60668

When the threshold is reached, an EEM event is triggered. The applet named memory-demo runs, causing a syslog message to be written to the console and a switch to be made to the secondary RP. The following messages are logged: 

00:08:31: %HA_EM-2-LOG: memory-demo: Memory exhausted; current available memory is
4484196 bytes
00:08:31: %HA_EM-6-FMS_SWITCH_HARDWARE: fh_io_msg: Policy has requested a hardware
switchover

The following is partial output from the show running-config command on both the primary RP and the secondary (redundant) RP: 

redundancy
 mode sso
.
.
!
event manager applet memory-demo 
 event snmp oid 1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact entry-op lt entry-val 
5120000 poll-interval 90
 action 1.0 syslog priority critical msg "Memory exhausted; current available memory 
is $_snmp_oid_val bytes"
 action 2.0 force-switchover

SNMP Notification Event Detector

The following example shows how to configure the snmp-server community public RW and snmp-server manager commands before event snmp-notification is configured. 

snmp-server community public RW
 snmp-server manager

The following example shows how an EEM applet called SNMP_Notification is being registered to run an EEM script when the device receives an SNMP notification on destination IP address 192.168.1.1 for object ID 1 whose value equals 10. 

event manager applet SNMP_Notification 
 event snmp-notification dest_ip_address 192.168.1.1 oid 1 op eq oid-value 10
 action 1 policy eem_script

Syslog Event Detector

The following example shows how to specify an EEM applet to run when syslog identifies that Ethernet interface 1/0 is down. The applet sends a message about the interface to syslog. 

event manager applet interface-down
 event syslog pattern ".*UPDOWN.*Ethernet1/0.*" occurs 4
 action 1.0 syslog msg "Ethernet interface 1/0 changed state 4 times"

Configuration Examples for Embedded Event Manager Applet

Example Identity Event Detector

The following example shows how a policy named "EventIdentity" is triggered every time the authentication on the Fast Ethernet interface 0 is success.

event manager applet EventIdentity
 event identity interface FastEthernet0 authc success
action 1.0 syslog msg "Applet EventIdentity"

Example MAT Event Detector

The following example shows how a policy named "EventMat" is triggered every time a mac-address is learned in the mac-address-table.

event manager applet EventMat
 event mat interface FastEthernet0 
action 1.0 syslog msg "Applet EventMat"

Example Neighbor-Discovery Event Detector

The following example shows how a policy named "EventNeighbor" is triggered when a Cisco Discovery Protocol (CDP) cache entry changes.

event manager applet EventNeighbor
 event neighbor-discovery interface FastEthernet0 cdp all
action 1.0 syslog msg "Applet EventNeighbor"

Embedded Event Manager Manual Policy Execution Examples

The following examples show how to use the none event detector to configure an EEM policy (applet or script) to be run manually.

Using the event manager run Command

This example shows how to run a policy manually using the event manager run command. The policy is registered using the event none command under applet configuration mode and then run from global configuration mode using the event manager run command.

event manager applet manual-policy
 event none
 action 1.0 syslog msg "Manual-policy triggered"
 end
!
event manager run manual-policy

Using the action policy Command

This example shows how to run a policy manually using the action policy command. The policy is registered using the event none command under applet configuration mode, and then the policy is executed using the action policy command in applet configuration mode.

event manager applet manual-policy
 event none
 action 1.0 syslog msg "Manual-policy triggered"
 exit
!
event manager applet manual-policy-two
 event none
 action 1.0 policy manual-policy
 end
!
event manager run manual-policy-two

Configuring and Tracking a Stub Object Using Embedded Event Manager Example

This example shows how to create a stub object, set the state of the stub object, and configure an EEM applet to be run when the tracked object changes. The enhanced object tracking (EOT) event detector is used, and actions are specified to both set and read the state of the object. This example allows EEM to define an EOT object that may be manipulated by other EOT clients. An EEM policy can be a trigger for any EOT object including objects defined for other EOT clients or for an object defined by EEM.

track 10 stub-object
 default-state down
!
event manager applet track-ten
 event track 10 state any
 action 1.0 track set 10 state up
 action 2.0 track read 10

Embedded Event Manager Watchdog System Monitor (Cisco IOS) Event Detector Configuration Example

The following example shows how to configure three EEM applets to demonstrate how the Cisco IOS watchdog system monitor (IOSWDSysMon) event detector works.

Watchdog System Monitor Sample1 Policy

The first policy triggers an applet when the average CPU usage for the process named IP Input is greater than or equal to 1 percent for 10 seconds: 

event manager applet IOSWD_Sample1 
 event ioswdsysmon sub1 cpu-proc taskname "IP Input" op ge val 1 period 10
 action 1.0 syslog msg "IOSWD_Sample1 Policy Triggered"

Watchdog System Monitor Sample2 Policy

The second policy triggers an applet when the total amount of memory used by the process named Net Input is greater than 100 kb: 

event manager applet IOSWD_Sample2 
 event ioswdsysmon sub1 mem-proc taskname "Net Input" op gt val 100 is-percent false
 action 1.0 syslog msg "IOSWD_Sample2 Policy Triggered"

Watchdog System Monitor Sample3 Policy

The third policy triggers an applet when the total amount of memory used by the process named IP RIB Update has increased by more than 50 percent over the sample period of 60 seconds: 

event manager applet IOSWD_Sample3 
 event ioswdsysmon sub1 mem-proc taskname "IP RIB Update" op gt val 50 is-percent true period 60
 action 1.0 syslog msg "IOSWD_Sample3 Policy Triggered"

The three policies are configured, and then repetitive large pings are made to the networking device from several workstations, causing the networking device to register some usage. This will trigger policies 1 and 2, and the console will display the following messages: 

00:42:23: %HA_EM-6-LOG: IOSWD_Sample1: IOSWD_Sample1 Policy Triggered
00:42:47: %HA_EM-6-LOG: IOSWD_Sample2: IOSWD_Sample2 Policy Triggered

To view the policies that are registered, use the show event manager policy registered command: 

Device# show event manager policy registered
No.  Class   Type    Event Type          Trap  Time Registered           Name
1    applet  system  ioswdsysmon         Off   Fri Jul 23 02:27:28 2004  IOSWD_Sample1
 sub1 cpu_util {taskname {IP Input} op ge val 1 period 10.000 }
 action 1.0 syslog msg "IOSWD_Sample1 Policy Triggered"
2    applet  system  ioswdsysmon         Off   Fri Jul 23 02:23:52 2004  IOSWD_Sample2
 sub1 mem_used {taskname {Net Input} op gt val 100 is_percent FALSE}
 action 1.0 syslog msg "IOSWD_Sample2 Policy Triggered"
3    applet  system  ioswdsysmon         Off   Fri Jul 23 03:07:38 2004  IOSWD_Sample3
 sub1 mem_used {taskname {IP RIB Update} op gt val 50 is_percent TRUE period 60.000 }
 action 1.0 syslog msg "IOSWD_Sample3 Policy Triggered"

Configuration SNMP Library Extensions Examples

SNMP Get Operations Examples

The following example shows how to send a get request to the local host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid
 1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val
 5120000 poll-interval 
90
Device(config-applet)# action 1.3 info type snmp oid
 1.3.6.1.2.1.1.1.0 get-type exact 
community
 public
Device(config-applet)# action 1.3 info type snmp oid
 1.3.6.1.2.1.1.4.0 get-type next community 
public

The following log message will be written to the SNMP event manager log: 

1d03h:%HA_EM-6-LOG: lg: 1.3.6.1.2.1.1.1.0
1d04h:%HA_EM-6-LOG: lgn: 1.3.6.1.2.1.1.5.0

The following example shows how to send a get request to a remote host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid
 1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val
 5120000 poll-interval
 90
Device(config-applet)# action 1.3 info type snmp oid 
1.3.6.1.2.1.1.4.0 get-type next community
 public ipaddr
 172.17.16.69
Device(config-applet)# action 1.3 info type snmp getid
 1.3.6.1.2.1.1.1.0 community
 public ipaddr
 172.17.16.69

The following log message is written to the SNMP event manager log: 

1d03h:%HA_EM-6-LOG: lg: 1.3.6.1.2.1.1.1.0
1d04h:%HA_EM-6-LOG: lgn: 1.3.6.1.2.1.1.5.0

SNMP GetID Operations Examples

The following example shows how to send a getid request to the local host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid 
1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val 
5120000 poll-interval
 90
Device(config-applet)# action 1.3 info type snmp getid
 community
 public

The following log message is written to the SNMP event manager log: 

1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysname_oid=1.3.6.1.2.1.1.5.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysname_value=jubjub.cisco.com
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syslocation_oid=1.3.6.1.2.1.1.6.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syslocation_value=
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysdescr_oid=1.3.6.1.2.1.1.1.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysobjectid_oid=1.3.6.1.2.1.1.2.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysobjectid_value=products.222
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysuptime_oid=1.3.6.1.2.1.1.3.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysuptime_oid=10131676
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syscontact_oid=1.3.6.1.2.1.1.4.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syscontact_value=YYY

The following example shows how to send a getid request to a remote host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid
 1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val
 5120000 poll-interval
 90
Device(config-applet)# action 1.3 info type snmp getid
 1.3.6.1.2.1.1.1.0 community
 public ipaddr
 172.17.16.69

The following log message is written to the SNMP event manager log: 

1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysname_oid=1.3.6.1.2.1.1.5.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysname_value=jubjub.cisco.com
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syslocation_oid=1.3.6.1.2.1.1.6.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syslocation_value=
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysdescr_oid=1.3.6.1.2.1.1.1.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysobjectid_oid=1.3.6.1.2.1.1.2.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysobjectid_value=products.222
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysuptime_oid=1.3.6.1.2.1.1.3.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_sysuptime_oid=10131676
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syscontact_oid=1.3.6.1.2.1.1.4.0
1d04h:%HA_EM-6-LOG: lgid: _info_snmp_syscontact_value=YYY

Set Operations Examples

The following example shows how to perform a set operation on the local host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid
 1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val
 5120000 poll-interval
 90
Device(config-applet)# action 1.3 info type snmp oid 
1.3.6.1.2.1.1.4.0 set-type
 integer
 5 sysName.0 community
 public

The following log message is written to the SNMP event manager log: 

1d04h:%HA_EM-6-LOG: lset: 1.3.6.1.2.1.1.4.0
1d04h:%HA_EM-6-LOG: lset: XXX

The following example shows how to perform a set operation on a remote host. 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid 
1.3.6.1.2.1.1.1.0 get-type exact entry-op
 lt entry-val
 5120000 poll-interval 
90
Device(config-applet)# action 1.3 info type snmp oid 
1.3.6.1.2.1.1.4.0 set-type integer
 5 sysName.0 community
 public ipaddr 
172.17.16.69

The following log message is written to the SNMP event manager log: 

1d04h:%HA_EM-6-LOG: lset: 1.3.6.1.2.1.1.4.0
1d04h:%HA_EM-6-LOG: lset: XXX

Generating SNMP Notifications Examples

The following example shows how to configure SNMP traps for the sysUpTime.0 variable: 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid
 1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact entry-op 
lt entry-val
 5120000 poll-interval 
90
Device(config-applet)# action 1.3 info type snmp var
 sysUpTime.0 oid 
1.3.6.1.4.1.9.9.43.1.1.6.1.3.41 integer
 2
Device(config-applet)# action 1.4 info type snmp trap
 enterprise-oid
 ciscoSyslogMIB.2 generic-trapnum 
6 specific-trapnum 
1 trap-oid
 1.3.6.1.4.1.9.9.41.2.0.1 trap-var 
sysUpTime.0

The following output is generated if the debug snmp packets command is enabled: 

Device# debug snmp packets
1d04h: SNMP: Queuing packet to 172.69.16.2
1d04h: SNMP: V1 Trap, ent ciscoSyslogMIB.2, addr 172.19.rap 1
clogHistoryEntry.3 = 4
clogHistoryEntry.6 = 9999
1d04h: SNMP: Queuing packet to 172.19.208.130
1d04h: SNMP: V1 Trap, ent ciscoSyslogMIB.2, addr 172.19.rap 1
clogHistoryEntry.3 = 4
clogHistoryEntry.6 = 9999
1d04h: SNMP: Packet sent via UDP to 172.69.16.2
1d04h: SNMP: Packet sent via UDP to 172.69.16.2
infra-view10:
Packet Dump:
30 53 02 01 00 04 04 63 6f 6d 6d a4 48 06 09 2b
06 01 04 01 09 09 29 02 40 04 ac 13 d1 17 02 01
06 02 01 01 43 04 00 9b 82 5d 30 29 30 12 06 0d
2b 06 01 04 01 09 09 29 01 02 03 01 03 02 01 04
30 13 06 0d 2b 06 01 04 01 09 09 29 01 02 03 01
06 02 02 27 0f
Received SNMPv1 Trap:
Community: comm
Enterprise: ciscoSyslogMIBNotificationPrefix
Agent-addr: 172.19.209.23
Enterprise Specific trap.
Enterprise Specific trap: 1
Time Ticks: 10191453
clogHistSeverity = error(4)
clogHistTimestamp = 9999

The following example shows how to configure SNMP inform requests for the sysUpTime.0 variable: 

Device(config)# event manager applet snmp
Device(config-applet)# event snmp oid 
1.3.6.1.4.1.9.9.48.1.1.1.6.1 get-type exact entry-op
 lt entry-val
 5120000 poll-interval
 90
Device(config-applet)# action 1.3 info type snmp var
 sysUpTime.0 oid 
1.3.6.1.4.1.9.9.43.1.1.6.1.3.41 integer
 2
Device(config-applet)# action 1.4 info type snmp inform 
trap-oid
 1.3.6.1.4.1.9.9.43.2.0.1 trap-var
 sysUpTime.0 community
 public ipaddr
 172.19.209.24

The following output is generated if the debug snmp packets command is enabled: 

Device# debug snmp packets
1d04h: SNMP: Inform request, reqid 24, errstat 0, erridx 0
sysUpTime.0 = 10244391
snmpTrapOID.0 = ciscoConfigManMIB.2.0.1
ccmHistoryEventEntry.3.40 = 1
1d04h: SNMP: Packet sent via UDP to 172.19.209.24.162
1d04h: SNMP: Packet received via UDP from 172.19.209.24 on FastEthernet0/0
1d04h: SNMP: Response, reqid 24, errstat 0, erridx 0
1d04h: SNMP: Response, reqid 24, errstat 0, erridx 0
1d04h: SNMP: Inform request, reqid 25, errstat 0, erridx 0
sysUpTime.0 = 10244396
snmpTrapOID.0 = ciscoConfigManMIB.2.0.1
ccmHistoryEventEntry.3.41 = 2
1d04h: SNMP: Packet sent via UDP to 172.19.209.24.162
1d04h: SNMP: Packet received via UDP from 172.19.209.24 on FastEthernet0/0
1d04h: SNMP: Response, reqid 25, errstat 0, erridx 0
1d04h: SNMP: Response, reqid 25, errstat 0, erridx 0
Device# debug snmp packets
5d04h: SNMP: Packet received via UDP from 172.19.209.23 on FastEthernet0/0
5d04h: SNMP: Inform request, reqid 24, errstat 0, erridx 0
sysUpTime.0 = 10244391
snmpTrapOID.0 = ciscoConfigManMIB.2.0.1
ccmHistoryEventEntry.3.40 = 1
5d04h: dest if_index = 1
5d04h: dest ip addr= 172.19.209.24
5d04h: SNMP: Response, reqid 24, errstat 0, erridx 0
5d04h: SNMP: Packet sent via UDP to 172.19.209.23.57748
5d04h: SNMP: Packet received via UDP from 172.19.209.23 on FastEthernet0/0
5d04h: SNMP: Inform request, reqid 25, errstat 0, erridx 0

Configuring Variable Logic for EEM Applets Examples

The following sections provide examples on some selected action commands. For information on all the action commands supporting variable logic within applets, see the table below.

In this example, conditional loops while, if and foreach are used to print data. Other action commands such as action divide, action increment and action puts are used to define the actions to be performed when the conditions are met. 

event manager applet printdata 
event none 
action 100 set colors "red green blue"
action 101 set shapes "square triangle rectange"
action 102 set i "1"
action 103 while $i lt 6
action 104  divide $i 2
action 105  if $_remainder eq 1
action 106   foreach _iterator "$colors"
action 107    puts nonewline "$_iterator "
action 108   end
action 109   puts ""
action 110  else
action 111   foreach _iterator "$shapes"
action 112    puts nonewline "$_iterator "
action 113   end
action 114   puts ""
action 115  end
action 116  increment i
action 117 end

When the event manager applet ex is run, the following output is obtained: 

event manager run printdata
red green blue
square triangle rectange
red green blue
square triangle rectange
red green blue

In this example, two environment variables poll_interface and max_rx_rate are set to F0/0 and 3 respectively. Every 30 seconds there is a poll on an interface for rx rate. If the rx rate is greater than the threshold, a syslog message is displayed.

This applet makes use of the foreach conditional statement to poll the interface, the if conditional block to compare the value under RXPS with max_rx_rate that was set in the EEM environment variable. 

event manager environment poll_interfaces F0/0
event manager environment max_rx_rate 3
ev man app check_rx_rate
ev timer watchdog name rx_timer time 30
action 100 foreach int $poll_interfaces
action 101  cli command "en"
action 102  cli command "show int $int summ | beg ------"
action 103  foreach line $_cli_result "\n"
action 105   regexp ".*[0-9]+\s+[0-9]+\s+[0-9]+\s+[0-9]+\s+[0-9]+\s+([0-9]+)\s+.*" $line junk rxps 
action 106   if $_regexp_result eq 1
action 107    if $rxps gt $max_rx_rate
action 108     syslog msg "Warning rx rate for $int is > than threshold. Current value is $rxps
 (threshold is $max_rx_rate)"
action 109    end
action 110   end
action 111  end
action 112 end

Example syslog message: 

 
Oct 16 09:29:26.153: %HA_EM-6-LOG: c: Warning rx rate for F0/0 is > than threshold. 
 Current value is 4 (threshold is 3)
The output of show int F0/0 summ is of the format:
		
#show int f0/0 summ

 *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count

  Interface               IHQ   IQD  OHQ   OQD  RXBS RXPS  TXBS TXPS TRTL
-------------------------------------------------------------------------
* FastEthernet0/0          0 87283    0     0     0    0     0    0    0

Note
To use other action commands supporting variable logic within applets, use the commands listed in the table below.
Table 6Available action commands

Action Commands

Purpose

action add

Adds the value of two variables when an EEM applet is triggered.

action append

Appends the given value to the current value of a variable when an EEM applet is triggered.

action break

Causes an immediate exit from a loop of actions when an EEM applet is triggered

action comment

Adds comments to an applet when an EEM applet is triggered

action context retrieve

Retrieves variables identified by a given set of context name keys when an EEM applet is triggered.

action context save

Saves information across multiple policy triggers when an EEM applet is triggered.

action continue

Continues with a loop of actions when an EEM applet is triggered.

action decrement

Decrements the value of a variable when an EEM applet is triggered.

action divide

Divides the dividend value by the given divisor value when an EEM applet is triggered.

action else

Specifies the beginning of else conditional action block in if / else conditional action block when an EEM applet is triggered.

action elseif

Identifies the beginning of the else conditional action block in the else / if conditional action block when an EEM applet is triggered.

action end

Specifies the identification of the end of an conditional action block in the if / else and while conditional action block when an EEM applet is triggered.

action exit

Specifies an immediate exit from the running applet configuration when an EEM applet is triggered.

action foreach

Specifies the iteration of an input string using the delimiter as a tokenizing pattern, when an EEM applet is triggered.

action gets

Gets an input from the local TTY in a synchronous applet and store the value in the given variable when an EEM applet is triggered.

action if

Specifies the identification of the beginning of an if conditional block when an EEM applet is triggered.

action if goto

Instructs the applet to jump to a given label if the specified condition is true when an EEM applet is triggered.

action increment

Increments the value of a variable when an EEM applet is triggered.

action info type interface-names

Specifies the action of obtaining interface names when an EEM applet is triggered.

action info type snmp getid

Retrieves the individual variables from a Simple Network Management Protocol (SNMP) entity during the SNMP get operation.

action info type snmp inform

Sends an SNMP inform requests when an EEM applet is triggered.

action info type snmp oid

Specifies the type of SNMP get operation and the object to retrieve during the SNMP set operation, when an EEM applet is triggered.

action info type snmp trap

Sends SNMP trap requests when an EEM applet is triggered.

action info type snmp var

Creates a variable for an SNMP object identifier (OID) and its value from an EEM applet

action multiply

Specifies the action of multiplying the variable value with a specified given integer value when an EEM applet is triggered.

action puts

Enables the action of printing data directly to the local tty when an EEM applet is triggered.

action regexp

Specifies the action of matching a regular expression pattern on an input string when an EEM applet is triggered.

action set (EEM)

Specifies the action of setting the value of a variable when an EEM applet is triggered.

action string compare

Specifies the action of comparing two unequal strings when an EEM applet is triggered.

action string equal

Specifies the action of verifying whether or not two strings are equal when an EEM applet is triggered

action string first

Specifies the action of returning the index on the first occurrence of string1 within string2 when an EEM applet is triggered.

action string index

Specifies the action of returning the characters specified at a given index value when an EEM applet is triggered.

action string last

Specifies the action of returning the index on the last occurrence of string1 within string 2 when an EEM applet is triggered.

action string length

Specifies the action of returning the number of characters in a string when the EEM applet is triggered.

action string match

Specifies the action of returning 1 to the $_string_result, if the string matches the pattern when an EEM applet is triggered.

action string range

Specifies the action of storing a range of characters in a string when an EEM applet is triggered.

action string replace

Specifies the action of storing a new string by replacing range of characters in the specified string when an EEM applet is triggered.

action string tolower

Specifies the action of storing specific range of characters of a string in lowercase when an EEM applet is triggered.

action string toupper

Specifies the action of storing specific range of characters of a string in uppercase when an EEM applet is triggered.

action string trim

Specifies the action to trim a string when an EEM applet is triggered.

action string trimleft

Specifies the action to trim the characters of one string from the left end of another string when an EEM applet is triggered.

action string trimright

Specifies the action to trim the characters one string from the right end of another string when an EEM applet is triggered.

action subtract

Subtracts the value of a variable from another value when an EEM applet is triggered.

action while

Specifies the action of identifying the beginning of a loop of conditional block when an EEM applet is triggered.

Configuring Event SNMP-Object Examples

The following example shows the SET operation and the value to set is in $_snmp_value and it is managed by the script. The example below saves the oid and its value as contexts to be retrieved later. 

event manager applet snmp-object1
 description "APPLET SNMP-OBJ-1"
 event snmp-object oid 1.3.6.1.2.1.31.1.1.1.18 type string sync no skip no istable yes default 0  
 action 1 syslog msg "SNMP-OBJ1:TRIGGERED" facility "SNMP_OBJ"
 action 2 context save key myoid variable "_snmp_oid"
 action 3 context save key myvalue variable "_snmp_value"

Configuring Description of an EEM Applet Examples

The following example shows how to add or modify the description for an Embedded Event Manager (EEM) applet that is run by sampling Simple Network Management Protocol (SNMP):

event manager applet test
 description "This applet looks for the word count in syslog messages"
 event syslog pattern "count" 
 action 1 syslog msg hi

Additional References

The following sections provide references related to writing EEM policies Using the Cisco IOS CLI.

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

EEM commands: complete command syntax, defaults, command mode, command history, usage guidelines, and examples

Cisco IOS Embedded Event Manager Command Reference

Embedded Event Manager overview

Embedded Event Manager Overview module

Embedded Event Manager policy writing using Tcl

Writing Embedded Event Manager Policies Using Tcl module

Configuring enhanced object tracking

Configuring Enhanced Object Tracking module

Standards

Standard

Title

No new or modified standards are supported, and support for existing standards has not been modified.

--

MIBs

MIB

MIBs Link

CISCO-EMBEDDED-EVENT-MGR-MIB

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported, and support for existing RFCs has not been modified.

--

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for Writing EEM 3.2 Policies Using the Cisco IOS CLI

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 7Feature Information for Writing EEM 3.2 Policies Using the Cisco IOS CLI

Feature Name

Releases

Feature Information

Embedded Event Manager 1.0

12.0(26)S 12.3(4)T

EEM 1.0 introduced Embedded Event Manager applet creation with the SNMP and syslog event detectors. EEM 1.0 also introduced the following actions: generating prioritized syslog messages, generating a CNS event for upstream processing by Cisco CNS devices, reloading the Cisco software, and switching to a secondary processor in a fully redundant hardware configuration.

The following commands were introduced by this feature: action cns-event, action force-switchover, action reload, action syslog, debug event manager, event manager applet, event snmp, event syslog, show event manager policy registered.

Embedded Event Manager 2.0

12.2(25)S

EEM 2.0 introduced the application-specific event detector, the counter event detector, the interface counter event detector, the timer event detector, and the watchdog event detector. New actions included modifying a named counter, publishing an application-specific event, and generating an SNMP trap. The ability to define environment variables and to run EEM policies written using Tcl was introduced, and two sample policies were included with the software.

The following commands were introduced by this feature: action counter, action publish-event, action snmp-trap, event application, event counter, event interface, event ioswdsysmon, event manager environment, event manager history size, event manager policy, event manager scheduler suspend, event timer, show event manager environment, show event manager history events, show event manager history traps, show event manager policy available, show event manager policy pending.

Embedded Event Manager 2.1

12.3(14)T 12.2(18)SXF5 12.2(28)SB 12.2(33)SRA

EEM 2.1 introduced some new event detectors and actions with new functionality to allow EEM policies to be run manually and the ability to run multiple concurrent policies. Support for Simple Network Management Protocol (SNMP) event detector rate-based events was provided as was the ability to create policies using Tool Command Language (Tcl).

The following commands were introduced or modified by this feature: action cli, action counter, action info, action mail, action policy, debug event manager, event cli, event manager directory user, event manager policy, event manager run, event manager scheduler script, event manager session cli username, event none, event oir, event snmp, event syslog, set(EEM), show event manager directory user, show event manager policy registered, show event manager session cli username.

Embedded Event Manager 2.1 (Software Modularity)

12.2(18)SXF4Cisco IOS Software Modularity images

EEM 2.1 for Software Modularity images introduced the GOLD, system manager, and WDSysMon (Cisco IOS Software Modularity watchdog) event detectors, and the ability to display Cisco IOS Software Modularity processes and process metrics.

The following commands were introduced by this feature: event gold, event process, show event manager metric process.

Note    EEM 2.1 for Software Modularity images also supports the resource and RF event detectors introduced in EEM 2.2, but it does not support the enhanced object tracking event detector or the actions to read and set tracked objects.

Embedded Event Manager 2.2

12.4(2)T 12.2(31)SB3 12.2(33)SRB

EEM 2.2 introduced the enhanced object tracking, resource, and RF event detectors. The actions of reading and setting the state of a tracked object were also introduced.

The following commands were introduced or modified by this feature: action track read, action track set, default-state, event resource, event rf, event track, show track, track stub-object.

SNMP event detector delta environment variable

12.4(11)T

A new SNMP event detector environment variable, _snmp_oid_delta_val, was introduced.

This is a minor enhancement. Minor enhancements are not typically listed in Feature Navigator.

Embedded Event Manager 2.3

12.2(33)SXH 12.2(33)SB

EEM 2.3 introduced some new features relative to the Generic Online Diagnostics (GOLD) Event Detector on the Cisco Catalyst 6500 Series switches.

The event gold command was enhanced in addition to the Tcl keywords--action-notify, testing-type, test-name, test-id, consecutive-failure, platform-action, and maxrun--for improved reaction to GOLD test failures and conditions

Read-only variables were added under the GOLD Event Detector category to provide access to platform-wide and test-specific GOLD event detector information for a detected event.

Embedded Event Manager 2.4

12.4(20)T 12.2(33)SXI 12.2(33)SRE

EEM 2.4 introduced several new features.

The following commands were introduced by this feature:

attribute (EEM) , correlate, event manager detector rpc, event manager directory user repository, event manager update user policy, event manager scheduler clear, event manager update user policy, event owner, event rpc, event snmp-notification, show event manager detector, show event manager version, trigger (EEM).

Embedded Event Manger 3.0

12.4(22)T 12.2(33)SRE 12.2(50)SY

EEM 3.0 introduced several new features.

The following commands were introduced or modified by this feature:

action add , action append, action break, action comment, action context retrieve, action context save, action continue, action decrement, action divide, action else, action elseif, action end, action exit, action foreach, action gets, action if, action if goto, action increment, action info type interface-names, action info type snmp getid, action info type snmp inform, action info type snmp oid, action info type snmp trap, action info type snmp var, action multiply, action puts, action regexp, action set (EEM), action string compare, action string equal, action string first, action string index, action string last, action string length, action string match, action string range, action string replace, action string tolower, action string toupper, action string trim, action string trimleft, action string trimright, action subtract, action while, event cli, event ipsla, event manager detector routing, event manager scheduler, event manager scheduler clear, event manager scheduler hold, event manager scheduler modify, event manager scheduler release, event nf, event routing, show event manager policy active, show event manager policy pending, and show event manager scheduler.

Embedded Event Manager 3.1

15.0(1)M 15.1(1)SY

EEM 3.1 introduced several new features.

The following commands were introduced or modified by this feature: action syslog, description (EEM) , event manager applet , event manager policy , event snmp-notification , event snmp-object , show event manager policy registered , and show event manager policy available .

Embedded Event Manager 3.2

12.2(52)SE 12.2(54)SG 15.1(3)T 15.1(1)SY

EEM is a distributed and customized approach to event detection and recovery offered directly in a Cisco IOS device.

The following sections provide information about this feature:

The following commands were introduced or modified: debug event manager, event identity, event mat, event neighbor-discovery, show event manager detector.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2012 Cisco Systems, Inc. All rights reserved.