Configuring the Embedded Event Manager

This chapter describes how to configure the Embedded Event Manager (EEM) to detect and handle critical events on Cisco NX-OS devices.

This chapter includes the following sections:

About EEM

EEM monitors events that occur on your device and takes action to recover or troubleshoot these events, based on your configuration.

EEM consists of three major components:

  • Event statements—Events to monitor from another Cisco NX-OS component that may require some action, workaround, or notification.

  • Action statements—An action that EEM can take, such as executing CLI commands, sending an email through the use of Smart Call Home feature, and disabling an interface to recover from an event.

  • Policies—An event that is paired with one or more actions to troubleshoot or recover from the event.

Policies

An EEM policy consists of an event statement and one or more action statements. The event statement defines the event to look for as well as the filtering characteristics for the event. The action statement defines the action EEM takes when the event occurs.

This figure shows the two basic statements in an EEM policy.

Figure 1. EEM Policy Statements

You can configure EEM policies using the command-line interface (CLI) or a VSH script.

EEM gives you a device-wide view of policy management. You configure EEM policies on the supervisor, and EEM pushes the policy to the correct module based on the event type. EEM takes any actions for a triggered event either locally on the module or on the supervisor (the default option).

EEM maintains event logs on the supervisor.

Cisco NX-OS has a number of preconfigured system policies. These system policies define many common events and actions for the device. System policy names begin with two underscore characters (__).

You can create user policies to suit your network. If you create a user policy, any actions in your policy occur after EEM triggers any system policy actions that are related to the same event as your policy.

You can also override some system policies. The overrides that you configure take the place of the system policy. You can override the event or the actions.

Use the show event manager system-policy command to view the preconfigured system policies and determine which policies that you can override.


Note


You should use the show running-config eem command to check the configuration of each policy. An override policy that consists of an event statement and no action statement triggers no action and no notification of failures.

Note


Your override policy should always include an event statement. An override policy without an event statement overrides all possible events in the system policy.

Event Statements

An event is any device activity for which some action, such as a workaround or a notification, should be taken. In many cases, these events are related to faults in the device such as when an interface or a fan malfunctions.

EEM defines event filters so only critical events or multiple occurrences of an event within a specified time period trigger an associated action.

This figure shows events that are handled by EEM.

Figure 2. EEM Overview

Event statements specify the event that triggers a policy to run. You can configure multiple event triggers.

EEM schedules and runs policies on the basis of event statements. EEM examines the event and action commands and runs them as defined.


Note


If you want to allow the triggered event to process any default actions, you must configure the EEM policy to allow the event default action statement.

Action Statements

Action statements describe the action triggered by a policy. Each policy can have multiple action statements. If no action is associated with a policy, EEM still observes events but takes no actions.

EEM supports the following actions in action statements:

  • Execute any CLI commands.

  • Update a counter.

  • Log an exception.

  • Force the shutdown of any module.

  • Reload the device.

  • Shut down specified modules because the power is over budget.

  • Generate a syslog message.

  • Generate a Call Home event.

  • Generate an SNMP notification.

  • Use the default action for the system policy.


Note


EEM can only process a complete action cli list of up to 1024 characters in total. If more actions are required, you must define them as a new redundant applet with same trigger.



Note


If you want to allow the triggered event to process any default actions, you must configure the EEM policy to allow the default action. For example, if you match a CLI command in a match statement, you must add the event-default action statement to the EEM policy or EEM will not allow the CLI command to execute.

Note


Verify that your action statements within your user policy or overriding policy do not negate each other or adversely affect the associated system policy.

VSH Script Policies

You can also write policies in a VSH script, using a text editor. These policies have an event statement and action statement(s) just as other policies, and these policies can either augment or override system policies. After you write your VSH script policy, copy it to the device and activate it.

Environment Variables

You can define environment variables for EEM that are available for all policies. Environment variables are useful for configuring common values that you can use in multiple policies. For example, you can create an environment variable for the IP address of an external email server.

You can use an environment variable in action statements by using the parameter substitution format.

This example shows a sample action statement to force a module 1 shutdown, with a reset reason of "EEM action."

switch (config-eem-policy)# action 1.0 forceshut module 1 reset-reason “EEM action.”

If you define an environment variable for the shutdown reason, called default-reason, you can replace that reset reason with the environment variable, as shown in the following example.

switch (config-eem-policy)# action 1.0 foreshut module 1 reset-reason $default-reason

You can reuse this environment variable in any policy.

EEM Event Correlation

You can trigger an EEM policy based on a combination of events. First, you use the tag keyword to create and differentiate multiple events in the EEM policy. Then using a set of boolean operators (and, or, andnot), along with the count and time, you can define a combination of these events to trigger a custom action.

High Availability

Cisco NX-OS supports stateless restarts for EEM. After a reboot or supervisor switchover, Cisco NX-OS applies the running configuration.

Virtualization Support

Not all actions or events are visible. You must have network-admin privileges to configure policies.

Prerequisites for EEM

EEM has the following prerequisites:

  • You must have network-admin user privileges to configure EEM.

Guidelines and Limitations for EEM

EEM has the following configuration guidelines and limitations:

  • The maximum number of configurable EEM policies is 500.

  • Action statements within your user policy or overriding policy should not negate each other or adversely affect the associated system policy.

  • If you want to allow a triggered event to process any default actions, you must configure the EEM policy to allow the default action. For example, if you match a CLI command in a match statement, you must add the event-default action statement to the EEM policy or EEM will not allow the CLI command to execute.

  • When you configure an EEM policy action to collect show tech commands, make sure to allocate enough time for the show tech commands to complete before the same action is called again.

  • An override policy that consists of an event statement and no action statement triggers no action and no notification of failures.

  • An override policy without an event statement overrides all possible events in the system policy.

  • The following rules apply to regular command expressions:

    • All regular expressions must conform to the Portable Operating System Interface for uniX (POSIX) extended standard.

    • All keywords must be expanded.

    • Only the * symbol can be used for argument replacement.

  • EEM event correlation is supported only on the supervisor module.

  • EEM event correlation is not supported across different modules within a single policy.

  • EEM event correlation supports up to four event statements in a single policy. The event types can be the same or different, but only these event types are supported: cli, counter, module, module-failure, oir, snmp, and syslog.

  • When more than one event statement is included in an EEM policy, each event statement must have a tag keyword with a unique tag argument.

  • EEM event correlation does not override the system default policies.

  • Default action execution is not supported for policies that are configured with tagged events.

  • You can invoke EEM from Python. For more information about Python, see the Cisco Nexus 9000 Series NX-OS Programmability Guide.

Default Settings for EEM

This table lists the default settings for EEM parameters.

Parameters Default
System policies Active

Configuring EEM

You can create policies that contain actions to take based on system policies. To display information about the system policies, use the show event manager system-policy command.

Defining an Environment Variable

You can define a variable to serve as a parameter in an EEM policy.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

event manager environment variable-name variable-value

Example:

switch(config)# event manager environment emailto “admin@anyplace.com”

Creates an environment variable for EEM. The variable-name can be any case-sensitive, alphanumeric string up to 29 characters. The variable-value can be any quoted alphanumeric string up to 39 characters.

Step 3

(Optional) show event manager environment {variable-name | all}

Example:

switch(config)# show event manager environment all
(Optional)

Displays information about the configured environment variables.

Step 4

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Defining a User Policy Using the CLI

You can define a user policy using the CLI to the device.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

event manager applet applet-name

Example:

switch(config)# event manager applet monitorShutdown
switch(config-applet)#

Registers the applet with EEM and enters applet configuration mode. The applet-name can be any case-sensitive, alphanumeric string up to 29 characters.

Step 3

(Optional) description policy-description

Example:

switch(config-applet)# description “Monitors interface shutdown.”
(Optional)

Configures a descriptive string for the policy. The string can be any alphanumeric string up to 80 characters. Enclose the string in quotation marks.

Step 4

event event-statement

Example:

switch(config-applet)# event cli match “conf t ; interface * ; shutdown”

Configures the event statement for the policy. Repeat this step for multiple event statements. See Configuring Event Statements.

Step 5

(Optional) tag tag {and | andnot | or} tag [and | andnot | or {tag}] {happens occurs in seconds}

Example:

switch(config-applet)# tag one or two happens 1 in 10000
(Optional)

Correlates multiple events in the policy.

The range for the occurs argument is from 1 to 4294967295. The range for the seconds argument is from 0 to 4294967295 seconds.

Step 6

action number[.number2] action-statement

Example:

switch(config-applet)#action 1.0 cli show interface Ethernet 3/1

Configures an action statement for the policy. Repeat this step for multiple action statements. See Configuring Action Statements.

Step 7

(Optional) show event manager policy-state name [module module-id]

Example:

switch(config-applet)# show event manager policy-state monitorShutdown
(Optional)

Displays information about the status of the configured policy.

Step 8

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Configuring Event Statements

Use one of the following commands in applet configuration mode to configure an event statement:

Command

Purpose

event application [tag tag] sub-system sub-system-id type event-type

Example:

switch(config-applet)# event application
sub-system 798 type 1

Triggers an event when an event specification matches the subsystem ID and application event type.

The range for the sub-system-id and for the event-type is from 1 to 4294967295.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

Note

 
To use this command, you must first enable the feature evmed command to enable generic event detectors.
event cli [tag tag] match expression [count repeats | time seconds]

Example:

switch(config-applet)# event cli match “conf t ; interface * ; shutdown”

Triggers an event if you enter a command that matches the regular expression.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

The repeats range is from 1 to 65000. The time range, in seconds, is from 0 to 4294967295, where 0 indicates no time limit.

event counter [tag tag] name counter entry-val entry entry-op {eq | ge | gt | le | lt | ne} [exit-val exit exit-op {eq | ge | gt | le | lt | ne}]

Example:

switch(config-applet)# event counter name
mycounter entry-val 20 gt

Triggers an event if the counter crosses the entry threshold based on the entry operation. The event resets immediately. Optionally, you can configure the event to reset after the counter passes the exit threshold.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

The counter name can be any case-sensitive, alphanumeric string up to 28 characters. The entry and exit value ranges are from 0 to 2147483647.

event fanabsent [fan number] time seconds

Example:

switch(config-applet)# event fanabsent time
300

Triggers an event if a fan is removed from the device for more than the configured time, in seconds. The number range is module-dependent. The seconds range is from 10 to 64000.

event fanbad [fan number] time seconds

Example:

switch(config-applet)# event fanbad time
3000

Triggers an event if a fan fails for more than the configured time, in seconds. The number range is module-dependent. The seconds range is from 10 to 64000.

event fib {adjacency extra | resource tcam usage | route {extra | inconsistent | missing}}

Example:

switch(config-applet)# event fib adjacency
extra

Triggers an event for one of the following:

  • adjacency extra—If there is an extra route in the unicast FIB.

  • resource tcam usage—Each time the TCAM utilization percentage becomes a multiple of 5, in either direction.

  • route {extra | inconsistent | missing} —If a route is added, changed, or deleted in the unicast FIB.

event gold module {slot | all} test test-name [severity {major | minor | moderate}] testing-type {bootup | monitoring | ondemand | scheduled} consecutive-failure count

Example:

switch(config-applet)# event gold module 2
test ASICRegisterCheck testing-type
ondemand consecutive-failure 2

Triggers an event if the named online diagnostic test experiences the configured failure severity for the configured number of consecutive failures. The slot range is from 1 to 10. The test-name is the name of a configured online diagnostic test. The count range is from 1 to 1000.

event interface [tag tag] {name interface slot/port parameter}

Example:

switch(config-applet)# event interface
ethernet 2/2 parameter

Triggers an event if the counter is exceeded for the specified interface.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

Note

 
To use this command, you must first enable the feature evmed command to enable generic event detectors.
event memory {critical | minor | severe}

Example:

switch(config-applet)# event memory
critical

Triggers an event if a memory threshold is crossed. See also Configuring Memory Thresholds.

event module [tag tag] status {online | offline | any} module {all | module-num}

Example:

switch(config-applet)# event module status
offline module all

Triggers an event if the specified module enters the selected status.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

event module-failure [tag tag] type failure-type module {slot | all} count repeats [time seconds]

Example:

switch(config-applet)# event module-failure
type lc-failed module 3 count 1

Triggers an event if a module experiences the failure type configured.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

The repeats range is from 0 to 4294967295. The seconds range is from 0 to 4294967295, where 0 indicates no time limit.

event none

Example:

switch(config-applet)# event none

Manually runs the policy event without any events specified.

Note

 
To use this command, you must first enable the feature evmed command to enable generic event detectors.
event oir [tag tag] {fan | module | powersupply} {anyoir | insert | remove} [number]

Example:

switch(config-applet)# event oir fan remove
4

Triggers an event if the configured device element (fan, module, or power supply) is inserted or removed from the device.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

You can optionally configure a specific fan, module, or power supply number. The number range is as follows:

  • Fan number—Module dependent.

  • Module number—Device dependent.

  • Power supply number—The range is from 1 to 3.

event policy-default count repeats [time seconds]

Example:

switch(config-applet)# event policy-default
count 3

Uses the event configured in the system policy. Use this option for overriding policies.

The repeats range is from 1 to 65000. The seconds range is from 0 to 4294967295, where 0 indicates no time limit.

event poweroverbudget

Example:

switch(config-applet)# event
poweroverbudget

Triggers an event if the power budget exceeds the capacity of the configured power supplies.

event snmp [tag tag] oid oid get-type {exact | next} entry-op {eq | ge | gt | le | lt | ne} entry-val entry [exit-comb {and | or}] exit-op {eq | ge | gt | le | lt | ne} exit-val exit exit-time time polling-interval interval

Example:

switch(config-applet)# event snmp oid
1.3.6.1.2.1.31.1.1.1.6 get-type next
entry-op lt 300 entry-val 0 exit-op eq 400
exit-time 30 polling-interval 300

Triggers an event if the SNMP OID crosses the entry threshold based on the entry operation. The event resets immediately, or optionally you can configure the event to reset after the counter passes the exit threshold. The OID is in dotted decimal notation.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

The entry and exit value ranges are from 0 to 18446744073709551615. The time, in seconds, is from 0 to 2147483647. The interval, in seconds, is from 1 to 2147483647.

event storm-control

Example:

switch(config-applet)# event storm-control

Triggers an event if traffic on a port exceeds the configured storm control threshold.

event syslog [occurs count] {pattern string | period time | priority level | tag tag}

Example:

switch(config-applet)# event syslog period
500

Triggers an event if the specified syslog threshold is exceeded. The range for the count is from 1 to 65000, and the range for the time is from 1 to 4294967295. The priority range is from 0 to 7.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

event sysmgr memory [module module-num] major major-percent minor minor-percent clear clear-percent

Example:

switch(config-applet)# event sysmgr memory
minor 80

Triggers an event if the specified system manager memory threshold is exceeded. The range for the percentage is from 1 to 99.

event sysmgr switchover count count time interval

Example:

switch(config-applet)# event sysmgr
switchover count 10 time 1000

Triggers an event if the specified switchover count is exceeded within the time interval specified. The switchover count is from 1 to 65000. The time interval is from 0 to 2147483647.

event temperature [module slot] [sensor-number] threshold {any | major | minor}

Example:

switch(config-applet)# event temperature
module 2 threshold any

Triggers an event if the temperature sensor exceeds the configured threshold. The sensor range is from 1 to 18.

event timer {absolute time time name name | countdown time time name name | cron cronentry string | tag tag | watchdog time time name name}

Example:

switch(config-applet)# event timer absolute
time 100 name abtimer

Triggers an event if the specified time is reached. The range for the time is from 1 to 4294967295.

  • absolute time—Triggers an event when the specified absolute time of day occurs.

  • countdown time—Triggers an event when when the specified time counts down to zero. The timer does not reset.

  • cron cronentry—Triggers an event when the CRON string specification matches the current time.

  • watchdog time—Triggers an event when the specified time counts down to zero. The timer automatically resets to the initial value and continues to count down.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

Note

 
To use this command, you must first enable the feature evmed command to enable generic event detectors.
event track [tag tag] object-number state {any | down | up}

Example:

switch(config-applet)# event track 1 state
down

Triggers an event if the tracked object is in the configured state.

The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

The object-number range is from 1 to 500.

Configuring Action Statements

Use the following commands in EEM configuration mode to configure action statements:

Command

Purpose

action number[.number2] cli command1 [command2...] [local]

Example:

switch(config-applet)# action 1.0 cli
show interface Ethernet 3/1

Runs the configured CLI commands. You can optionally run the commands on the module where the event occurred. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] counter name counter value val op {dec | inc | nop | set}

Example:

switch(config-applet)# action 2.0 counter
name mycounter value 20 op inc

Modifies the counter by the configured value and operation. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

The counter name can be any case-sensitive, alphanumeric string up to 28 characters. The val can be an integer from 0 to 2147483647 or a substituted parameter.

action number[.number2] event-default

Example:

switch(config-applet)# action 1.0 event-default

Executes the default action for the associated event. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] forceshut [module slot | xbar xbar-number] reset-reason seconds

Example:

switch(config-applet)# action 1.0 forceshut 
module 2 reset-reason “flapping links”

Forces a module, crossbar, or the entire system to shut down. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

The reset reason is a quoted alphanumeric string up to 80 characters.

action number[.number2] overbudgetshut [module slot[-slot]]

Example:

switch(config-applet)# action 1.0
overbudgetshut module 3-5

Forces one or more modules or the entire system to shut down because of a power overbudget issue.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] policy-default

Example:

switch(config-applet)# action 1.0 policy-default

Executes the default action for the policy that you are overriding. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] publish-event

Example:

switch(config-applet)# action 1.0 publish-event

Forces the publication of an application-specific event. The action label is in the format number1.number2.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] reload [module slot[-slot]]

Example:

switch(config-applet)# action 1.0 reload
module 3-5

Forces one or more modules or the entire system to reload.

number can be any number up to 16 digits. The range for number2 is from 0 to 9.

action number[.number2] snmp-trap {[intdata1 data [intdata2 data]] [strdata string]}

Example:

switch(config-applet)# action 1.0 snmp-trap
strdata “temperature problem”

Sends an SNMP trap with the configured data. number can be any number up to 16 digits. The range for number2 is from 0 to 9.

The data arguments can by any number up to 80 digits. The string can be any alphanumeric string up to 80 characters.

action number[.number2] syslog [priority prio-val] msg error-message

Example:

switch(config-applet)# action 1.0 syslog
priority notifications msg “cpu high”

Sends a customized syslog message at the configured priority. number can be any number up to 16 digits. The range for number2 is from 0 to 9.

The error-message can be any quoted alphanumeric string up to 80 characters.


Note


If you want to allow the triggered event to process any default actions, you must configure the EEM policy to allow the default action. For example, if you match a CLI command in a match statement, you must add the event-default action statement to the EEM policy or EEM will not allow the CLI command to execute. You can use the terminal event-manager bypass command to allow all EEM policies with CLI matches to execute the CLI command.

Defining a Policy Using a VSH Script

You can define a policy using a VSH script.

Before you begin

Ensure that you are logged in with administrator privileges.

Ensure that your script name is the same name as the script filename.

Procedure


Step 1

In a text editor, list the commands that define the policy.

Step 2

Name the text file and save it.

Step 3

Copy the file to the following system directory: bootflash://eem/user_script_policies.


Registering and Activating a VSH Script Policy

You can register and activate a policy defined in a VSH script.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

event manager policy policy-script

Example:

switch(config)# event manager policy moduleScript

Registers and activates an EEM script policy. The policy-script can be any case-sensitive alphanumeric string up to 29 characters.

Step 3

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Overriding a Policy

You can override a system policy.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

(Optional) show event manager policy-state system-policy

Example:

switch(config-applet)# show event manager policy-state __ethpm_link_flap 
Policy __ethpm_link_flap
Cfg count : 5
Cfg time interval : 10.000000 (seconds)
Hash default, Count 0
(Optional)

Displays information about the system policy that you want to override, including thresholds. Use the show event manager system-policy command to find the system policy names.

Step 3

event manager applet applet-name override system-policy

Example:

switch(config)# event manager applet ethport override __ethpm_link_flap
switch(config-applet)#

Overrides a system policy and enters applet configuration mode. The applet-name can be any case-sensitive alphanumeric string up to 29 characters. The system-policy must be one of the existing system policies.

Step 4

(Optional) description policy-description

Example:

description “Overrides link flap policy.”
(Optional)

Configures a descriptive string for the policy. The string can be any alphanumeric string up to 80 characters. Enclose the string in quotation marks.

Step 5

event event-statement

Example:

switch(config-applet)# event policy-default count 2 time 1000

Configures the event statement for the policy.

Step 6

action number action-statement

Example:

switch(config-applet)# action 1.0 syslog priority warnings msg “Link is flapping.”

Configures an action statement for the policy.

Repeat this step for multiple action statements.

Step 7

(Optional) show event manager policy-state name

Example:

switch(config-applet)# show event manager policy-state ethport
(Optional)

Displays information about the configured policy.

Step 8

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Configuring Memory Thresholds

You can set the memory thresholds that are used to trigger events and set whether the operating system should kill processes if it cannot allocate memory.

Before you begin

Ensure that you are logged in with administrator privileges.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

system memory-thresholds minor minor severe severe critical critical

Example:

switch(config)# system memory-thresholds minor 60 severe 70 critical 80

Configures the system memory thresholds that generate EEM memory events. The default values are as follows:

  • Minor-85

  • Severe-90

  • Critical-95

When these memory thresholds are exceeded, the system generates the following syslogs:

  • 2013 May 7 17:06:30 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : MINOR

  • 2013 May 7 17:06:30 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : SEVERE

  • 2013 May 7 17:06:30 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : CRITICAL

  • 2013 May 7 17:06:35 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : MINOR ALERT RECOVERED

  • 2013 May 7 17:06:35 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : SEVERE ALERT RECOVERED

  • 2013 May 7 17:06:35 switch %$ %PLATFORM-2-MEMORY_ALERT: Memory Status Alert : CRITICAL ALERT RECOVERED

Step 3

(Optional) system memory-thresholds threshold critical no-process-kill

Example:

switch(config)# system memory-thresholds threshold critical no-process-kill
(Optional)

Configures the system to not kill processes when the memory cannot be allocated. The default value is to allow the system to kill processes, starting with the one that consumes the most memory.

Step 4

(Optional) show running-config | include "system memory"

Example:

switch(config-applet)# show running-config | include “system memory”
(Optional)

Displays information about the system memory configuration.

Step 5

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Configuring Syslog as EEM Publisher

You can monitor syslog messages from the switch.


Note


The maximum number of searchable strings to monitor syslog messages is 10.

Before you begin

EEM should be available for registration by syslog.

The syslog daemon must be configured and executed.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal
switch(config)#

Enters global configuration mode.

Step 2

event manager applet applet-name

Example:

switch(config)# event manager applet abc
switch(config-applet)#

Registers an applet with EEM and enters applet configuration mode.

Step 3

event syslog [tag tag] {occurs number | period seconds | pattern msg-text | priority priority}

Example:

switch(config-applet)# event syslog occurs 10

Monitors syslog messages and invokes the policy based on the search string in the policy.

  • The tag tag keyword-argument pair identifies this specific event when multiple events are included in the policy.

  • The occurs number keyword-argument pair specifies the number of occurrences. The range is from 1 to 65000.

  • The period seconds keyword-argument pair specifies the interval during which the event occurs. The range is from 1 to 4294967295.

  • The pattern msg-text keyword-argument pair specifies the matching regular expression. The pattern can contain character text, an environment variable, or a combination of the two. If the string contains embedded blanks, it is enclosed in quotation marks.

  • The priority priority keyword-argument pair specifies the priority of the syslog messages. If this keyword is not selected, all syslog messages are set at the informational priority level.

Step 4

(Optional) copy running-config startup-config

Example:

switch(config)# copy running-config startup-config
(Optional)

Copies the running configuration to the startup configuration.

Verifying the EEM Configuration

To display EEM configuration information, perform one of the following tasks:

Command Purpose

show event manager environment [variable-name | all]

Displays information about the event manager environment variables.

show event manager event-types [event | all | module slot]

Displays information about the event manager event types.

show event manager history events [detail] [maximum num-events] [severity {catastrophic | minor | moderate | severe}]

Displays the history of events for all policies.

show event manager policy-state policy-name

Displays information about the policy state, including thresholds.

show event manager script system [policy-name | all]

Displays information about the script policies.

show event manager system-policy [all]

Displays information about the predefined system policies.

show running-config eem

Displays information about the running configuration for EEM.

show startup-config eem

Displays information about the startup configuration for EEM.

Configuration Examples for EEM

This example shows how to override the __lcm_module_failure system policy by changing the threshold for just module 3 hitless upgrade failures. This example also sends a syslog message. The settings in the system policy, __lcm_module_failure, apply in all other cases.

event manager applet example2 override __lcm_module_failure
event module-failure type hitless-upgrade-failure module 3 count 2
action 1 syslog priority errors msg module 3 “upgrade is not a hitless upgrade!”
action 2 policy-default

This example shows how to override the __ethpm_link_flap system policy and shuts down the interface:

event manager applet ethport override __ethpm_link_flap
event policy-default count 2 time 1000
action 1 cli conf t
action 2 cli int et1/1
action 3 cli no shut

This example creates an EEM policy that allows the CLI command to execute but triggers an SNMP notification when a user enters configuration mode on the device:

event manager applet TEST
event cli match "conf t"
action 1.0 snmp-trap strdata "Configuration change"
action 2.0 event-default


Note


You must add the event-default action statement to the EEM policy or EEM will not allow the CLI command to execute.

This example shows how to correlate multiple events in an EEM policy and execute the policy based on a combination of the event triggers. In this example, the EEM policy is triggered if one of the specified syslog patterns occurs within 120 seconds.

event manager applet eem-correlate
event syslog tag one pattern "copy bootflash:.* running-config.*”
event syslog tag two pattern “copy run start”
event syslog tag three pattern “hello”
tag one or two or three happens 1 in 120
action 1.0 reload module 1


Note


For additional EEM configuration examples, see .