Configuring CPU Threshold Notifications

The CPU Thresholding Notification feature notifies users when a predefined threshold of CPU usage is crossed by generating a Simple Network Management Protocol (SNMP) trap message for the top users of the CPU.

Release
Modification

12.0(26)S

This feature was introduced.

12.3(4)T

This feature was integrated into Cisco IOS Release 12.3(4)T.

12.2(25)S

This feature was integrated into Cisco IOS Release 12.2(25)S.


Feature History for the CPU Thresholding Notification Feature

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

Contents

•Restrictions for CPU Thresholding Notification

•Information About CPU Thresholding Notification

•How to Configure CPU Thresholding Notification

•Configuration Examples for CPU Thresholding Notification

•Additional References

•Command Reference

Restrictions for CPU Thresholding Notification

CPU utilization averages are computed by Cisco IOS software using a 4-millisecond Network-to-Management Interface (NMI) tick. In the unlikely event where the traffic rate is a multiple of this tick rate over a prolonged period of time, the CPU Thresholding Notification feature may not accurately measure the CPU load.

Information About CPU Thresholding Notification

The CPU Thresholding Notification feature allows you to configure CPU utilization thresholds that, when crossed, trigger a notification. Two types of CPU utilization threshold are supported:

•Rising Threshold

•Falling Threshold

Rising Threshold

A rising CPU utilization threshold specifies the percentage of CPU resources that, when exceeded for a configured period of time, triggers a CPU threshold notification.

Falling Threshold

A falling CPU utilization threshold specifies the percentage of CPU resources that, when CPU usage falls below this level for a configured period of time, triggers a CPU threshold notification.

How to Configure CPU Thresholding Notification

This section contains the following procedures:

•Enabling CPU Thresholding Notification

•Defining CPU Thresholding Notification

•Setting the Entry Limit and Size of CPU Utilization Statistics

Enabling CPU Thresholding Notification

To specify the recipient of SNMP notification operations and enable CPU thresholding notification, perform these steps:

SUMMARY STEPS

1. enable

2. configure terminal

3. snmp-server enable traps cpu threshold

4. snmp-server host host-address [traps | informs] [version {1 | 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] cpu [notification-type] [vrf vrf-name]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enables global configuration mode.

Step 3 

snmp-server enable traps cpu threshold

Example:

Router(config)# snmp-server enable traps cpu threshold

Enables CPU thresholding violation notification as traps and inform requests.

Step 4 

snmp-server host host-address [traps | informs] [version {1 | 2c | 3 [auth | noauth | priv]}] community-string [udp-port port] cpu [notification-type] [vrf vrf-name]

Example:

Router(config)# snmp-server host 192.168.0.0 traps public cpu

Sends CPU traps to the specified address.

Defining CPU Thresholding Notification

To define a rising and a falling CPU threshold notification, perform these steps:

SUMMARY STEPS

1. enable

2. configure terminal

3. process cpu threshold type {total | process | interrupt} rising percentage interval seconds [falling percentage interval seconds]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3  

process cpu threshold type {total | process | 
interrupt} rising percentage interval seconds 
[falling percentage interval seconds]
Example: 
Router(config)# process cpu threshold type 
total rising 80 interval 5 falling 20 
interval 5

Sets the CPU thresholding notifications types and values.

•In this example, the CPU utilization threshold is set to 80 percent for a rising threshold notification and 20 percent for a falling threshold notification, with a 5-second polling interval.

Setting the Entry Limit and Size of CPU Utilization Statistics

To set the process entry limit and the size of the history table for CPU utilization statistics, perform these steps:

SUMMARY STEPS

1. enable

2. configure terminal

3. process cpu statistics limit entry-percentage number [size seconds]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

process cpu statistics limit entry-percentage number [size seconds]

Example:

Router(config)# process cpu statistics limit entry-percentage 40 size 300

Sets the process entry limit and the size of the history table for CPU utilization statistics.

•In this example, to generate an entry in the history table, a process must exceed 40 percent CPU utilization.

•In this example, the duration of time for which the most recent history is saved in the history table is 300 seconds.

Configuration Examples for CPU Thresholding Notification

The following examples show how to set a rising and a falling CPU thresholding notification:

•Setting a Rising CPU Thresholding Notification: Example

•Setting a Falling CPU Thresholding Notification: Example

Setting a Rising CPU Thresholding Notification: Example

The following example shows how to set a rising CPU thresholding notification for total CPU utilization. When total CPU utilization exceeds 80 percent for a period of 5 seconds or longer, a rising threshold notification is sent. 

Router(config)# process cpu threshold type total rising 80 interval 5

Note When the optional falling arguments (percentage and seconds) are not specified, they take on the same values as the rising arguments (percentage and seconds).

Setting a Falling CPU Thresholding Notification: Example

The following example shows how to set a falling CPU thresholding notification for total CPU utilization. When total CPU utilization, which at one point had risen above 80 percent and triggered a rising threshold notification, falls below 70 percent for a period of 5 seconds or longer, a falling threshold notification is sent. 

Router(config)# process cpu threshold type total rising 80 interval 5 falling 70 
interval 5

Note When the optional falling arguments (percentage and seconds) are not specified, they take on the same values as the rising arguments (percentage and seconds).

Additional References

For additional information related to the CPU Thresholding Notification feature, refer to the following references:

Related Documents

Related Topic
Document Title

SNMP traps

Configuration Fundamentals Command Reference


Standards

Standards
Title

No new or modified standards are supported by this feature and support for existing standards has not been modified by this feature.

—


MIBs

MIBs
MIBs Link

CISCO-PROCESS-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

RFCs
Title

No new or modified RFCs are supported by this feature and support for existing RFCs has not been modified by this feature.

—


Technical Assistance

Description
Link

Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/public/support/tac/home.shtml


Command Reference

The following new and modified commands are pertinent to this feature. To see the command pages for these commands and other commands used with this feature, go to the Cisco IOS Master Commands List, Release 12.4, at http://www.cisco.com/en/US/docs/ios/mcl/124mainlinemcl/124_book.html.

•process cpu statistics limit entry-percentage

•process cpu threshold type

•snmp-server enable traps cpu

•snmp-server host

CCDE, CCENT, Cisco Eos, Cisco Lumin, Cisco Nexus, Cisco StadiumVision, Cisco TelePresence, Cisco WebEx, the Cisco logo, DCE, and Welcome to the Human Network are trademarks; Changing the Way We Work, Live, Play, and Learn and Cisco Store are service marks; and Access Registrar, Aironet, AsyncOS, Bringing the Meeting To You, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, EtherFast, EtherSwitch, Event Center, Fast Step, Follow Me Browsing, FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, iPhone, iQuick Study, IronPort, the IronPort logo, LightStream, Linksys, MediaTone, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, Network Registrar, PCNow, PIX, PowerPanels, ProConnect, ScriptShare, SenderBase, SMARTnet, Spectrum Expert, StackWise, The Fastest Way to Increase Your Internet Quotient, TransPath, WebEx, and the WebEx logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.

All other trademarks mentioned in this document or website 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. (0809R)


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

© 2007 Cisco Systems, Inc. All rights reserved.