Cisco IOS and NX-OS Software

Table Of Contents

IP SLAs—Multioperation Scheduling of IP SLAs Operations

Finding Feature Information

Contents

Prerequisites for Multioperation Scheduling of IP SLAs Operations

Information About Scheduling Multiple and Recurring IP SLAs Operations

Scheduling of Multiple IP SLAs Operations

Default Behavior of IP SLAs Multiple Operations Scheduling

IP SLAs Multiple Operations Scheduling with Scheduling Period Less Than Frequency

Multiple Operations Scheduling When the Number of IP SLAs Operations Are Greater Than the Schedule Period

IP SLAs Multiple Operations Scheduling with Scheduling Period Greater Than Frequency

IP SLAs Random Scheduler

How to Schedule Multiple and Recurring IP SLAs Operations

Scheduling Multiple IP SLAs Operations

Prerequisites

Restrictions

Enabling the IP SLAs Random Scheduler

Prerequisites

Verifying IP SLAs Multiple Operations Scheduling

Examples

Configuration Examples for Multioperation Scheduling of IP SLAs Operations

Scheduling Multiple IP SLAs Operations: Example

Enabling the IP SLAs Random Scheduler: Example

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Multioperation Scheduling of IP SLAs Operations

IP SLAs—Multioperation Scheduling of IP SLAs Operations

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First Published: August 14, 2006

Last Updated: November 11, 2008

This document describes how to schedule multiple operations at once using the Cisco IOS IP Service Level Agreements (SLAs) group-scheduling feature.

Cisco IOS IP SLAs allows you to analyze IP service levels for IP applications and services, to increase productivity, to lower operational costs, and to reduce occurrences of network congestion or outages. IP SLAs uses active traffic monitoring—the generation of traffic in a continuous, reliable, and predictable manner with proactive notification capabilities—for measuring network performance. IP SLAs can be used for network troubleshooting, network assessment, and health monitoring.

The ability to schedule hundreds of operations at once allows service providers with large networks to monitor service levels for multiple environments.

In addition to allowing you to schedule multiple IP SLAs operations with a single command, IP SLAs can be used to schedule operations to run at equal intervals, automatically distributing the operations over a specified time frame. This distribution helps to minimize the CPU utilization, thereby enhancing the scalability of the IP SLAs monitoring solution.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see 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 for Multioperation Scheduling of IP SLAs Operations" section.

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

Contents

•Prerequisites for Multioperation Scheduling of IP SLAs Operations

•Information About Scheduling Multiple and Recurring IP SLAs Operations

•How to Schedule Multiple and Recurring IP SLAs Operations

•Configuration Examples for Multioperation Scheduling of IP SLAs Operations

•Where to Go Next

•Additional References

•Feature Information for Multioperation Scheduling of IP SLAs Operations

Prerequisites for Multioperation Scheduling of IP SLAs Operations

•Configure the IP SLAs operations before group scheduling those operations.

•Determine the IP SLAs operations you want to schedule as a single group.

•Identify the network traffic type and the location of your network management station.

•Identify the topology and the types of devices in your network.

•Decide on the frequency of testing for each operation.

Information About Scheduling Multiple and Recurring IP SLAs Operations

To schedule IP SLAs as multiple or recurring operations, you should understand the following concept:

•Scheduling of Multiple IP SLAs Operations

•IP SLAs Random Scheduler

Scheduling of Multiple IP SLAs Operations

Normal scheduling of IP SLAs operations allows you to schedule one operation at a time. If you have large networks with thousands of IP SLAs operations to monitor network performance, normal scheduling (scheduling each operation individually) will be inefficient and time-consuming.

Multiple operations scheduling allows you to schedule multiple IP SLAs operations using a single command through the command line interface (CLI) or the CISCO-RTTMON-MIB. This feature allows you to control the amount of IP SLAs monitoring traffic by scheduling the operations to run at evenly distributed times. You must specify the operation ID numbers to be scheduled and the time range over which all the IP SLAs operations should start. This feature automatically distributes the IP SLAs operations at equal intervals over a specified time frame. The spacing between the operations (start interval) is calculated and the operations are started. This distribution of IP SLAs operations helps minimize the CPU utilization and thereby enhances the scalability of the network.

The IP SLAs multiple operations scheduling functionality allows you to schedule multiple IP SLAs operations as a group using the ip sla group schedule command. The following parameters can be configured with this command:

•Group operation number—Group configuration or group schedule number of the IP SLAs operation to be scheduled.

•Operation ID numbers—A list of IP SLAs operation ID numbers in the scheduled operation group.

•Schedule period—Amount of time for which the IP SLAs operation group is scheduled.

•Ageout—Amount of time to keep the operation in memory when it is not actively collecting information. By default, the operation remains in memory indefinitely.

•Frequency—Amount of time after which each IP SLAs operation is restarted. When the frequency option is specified, it overwrites the operation frequency of all operations belonging to the group. Note that when the frequency option is not specified, the frequency for each operation is set to the value of the schedule period.

•Life—Amount of time the operation actively collects information. The operation can be configured to run indefinitely. By default, the lifetime of an operation is one hour.

•Start time—Time when the operation starts collecting information. You can specify an operation to start immediately or at an absolute start time using hours, minutes, seconds, day, and month.

The IP SLAs multiple operations scheduling functionality schedules the maximum number of operations possible without aborting. However, this functionality skips those IP SLAs operations that are already running or those that are not configured and hence do not exist. The total number of operations will be calculated based on the number of operations specified in the command, irrespective of the number of operations that are missing or already running. The IP SLAs multiple operations scheduling functionality displays a message showing the number of active and missing operations. However, these messages are displayed only if you schedule operations that are not configured or are already running.

A main benefit for scheduling multiple IP SLAs operations is that the load on the network is reduced by distributing the operations equally over a scheduled period. This distribution helps you to achieve more consistent monitoring coverage. To illustrate this scenario, consider configuring 60 operations to start during the same 1-second interval over a 60-second schedule period. If a network failure occurs 30 seconds after all 60 operations have started and the network is restored before the operations are due to start again (in another 30 seconds), then this failure would never be detected by any of the 60 operations. However, if the 60 operations are distributed equally at 1-second intervals over a 60-second schedule period, then some of the operations would detect the network failure. Conversely, if a network failure occurs when all 60 operations are active, then all 60 operations would fail, indicating that the failure is possibly more severe than it really is.

Operations of the same type and same frequency should be used for IP SLAs multiple operations scheduling. If you do not specify a frequency, the default frequency will be the same as that of the schedule period. The schedule period is the period of time in which all the specified operations should run. The following sections explain the IP SLAs multiple operations scheduling process:

•Default Behavior of IP SLAs Multiple Operations Scheduling

•IP SLAs Multiple Operations Scheduling with Scheduling Period Less Than Frequency

•Multiple Operations Scheduling When the Number of IP SLAs Operations Are Greater Than the Schedule Period

•IP SLAs Multiple Operations Scheduling with Scheduling Period Greater Than Frequency

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Note The examples that follow focus on the interaction of the schedule period and frequency values, so the additional command syntax, such as start time and lifetime values, is not included in the illustrations.

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Default Behavior of IP SLAs Multiple Operations Scheduling

The IP SLAs Multiple Operations Scheduling feature allows you to schedule multiple IP SLAs operations as a group using the ip sla group schedule command. In the example shown in Figure 1, the ip sla group schedule 1 1-10 schedule-period 20 [frequency 20] command is configured. This example schedules operation 1 to operation 10 within operation group 1. Operation group 1 has a schedule period of 20 seconds, which means that all operations in the group will be started at equal intervals within a 20-second period. By default, the frequency is set to the same value as the configured schedule period. As shown in Figure 1, configuring the frequency is optional because 20 is the default.

Figure 1 Schedule Period Equals Frequency—Default Behavior

In this example, the first operation (operation 1) in operation group 1 will start at 0 seconds. All 10 operations in operation group 1 (operation 1 to operation 10) must be started in the schedule period of 20 seconds. The start time of each IP SLAs operation is evenly distributed over the schedule period by dividing the schedule period by the number of operations (20 seconds divided by 10 operations). Therefore, each operation will start 2 seconds after the previous operation.

The frequency is the period of time that passes before the operation group is started again (repeated). If the frequency is not specified, the frequency is set to the value of the schedule period. In the example shown in Figure 1, operation group 1 will start again every 20 seconds. This configuration provides optimal division (spacing) of operations over the specified schedule period.

IP SLAs Multiple Operations Scheduling with Scheduling Period Less Than Frequency

As the frequency value in the ip sla group schedule configuration is the amount of time that passes before the schedule group is restarted, if the schedule period is less than the frequency, there will be a period of time in which no operations are started.

In the example shown in Figure 2, the ip sla group schedule 1 1-10 schedule-period 20 frequency 30 command is configured. This example schedules operation 1 to operation 10 within operation group 2. Operation group 2 has a schedule period of 20 seconds and a frequency of 30 seconds.

Figure 2 Schedule Period Is Less Than Frequency

In this example, the first operation (operation 1) in operation group 2 will start at 0 seconds. All 10 operations in operation group 2 (operation 1 to operation 10) must be started in the schedule period of 20 seconds. The start time of each IP SLAs operation is evenly distributed over the schedule period by dividing the schedule period by the number of operations (20 seconds divided by 10 operations). Therefore, each operation will start 2 seconds after the previous operation.

In the first iteration of operation group 2, operation 1 starts at 0 seconds, and the last operation (operation 10) starts at 18 seconds. However, because the group frequency has been configured to 30 seconds each operation in the operation group is restarted every 30 seconds. So, after 18 seconds, there is a gap of 10 seconds as no operations are started in the time from 19 seconds to 29 seconds. Hence, at 30 seconds, the second iteration of operation group 2 starts. As all ten operations in the operation group 2 must start at an evenly distributed interval in the configured schedule period of 20 seconds, the last operation (operation 10) in the operation group 2 will always start 18 seconds after the first operation (operation 1).

As shown in Figure 2, the following events occur when the ip sla group schedule 1 1-10 schedule-period 20 frequency 30 command is configured:

•At 0 seconds, the first operation (operation 1) in operation group 2 is started.

•At 18 seconds, the last operation (operation 10) in operation group 2 is started. This means that the first iteration (schedule period) of operation group 1 ends here.

•From 19 to 29 seconds, no operations are started.

•At 30 seconds, the first operation (operation 1) in operation group 2 is started again. The second iteration of operation group 2 starts here.

•At 48 seconds (18 seconds after the second iteration started) the last operation (operation 10) in operation group 2 is started, and the second iteration of operation group 2 ends.

•At 60 seconds, the third iteration of operation group 2 starts.

This process continues until the lifetime of operation group 2 ends. The lifetime can be configured using the ip sla group schedule command. The default lifetime for an operation group is forever.

Multiple Operations Scheduling When the Number of IP SLAs Operations Are Greater Than the Schedule Period

The minimum time interval between the start of IP SLAs operations in a group operation is 1 second. Therefore, if the number of operations to be multiple scheduled is greater than the schedule period, the IP SLAs multiple operations scheduling functionality will schedule more than one operation to start within the same 1-second interval. If the number of operations getting scheduled does not equally divide into 1-second intervals, then the operations are equally divided at the start of the schedule period with the remaining operations to start at the last 1-second interval.

In the example shown in Figure 3, the ip sla group schedule 3 1-10 schedule-period 5 frequency 10 command is configured. This example schedules operation 1 to operation 10 within operation group 3. Operation group 3 has a schedule period of 5 seconds and a frequency of 10 seconds.

Figure 3 Number of IP SLAs Operations Is Greater Than the Schedule Period—Even Distribution

In this example, when dividing the schedule period by the number of operations (5 seconds divided by 10 operations, which equals one operation every 0.5 seconds) the start time of each IP SLAs operation is less than 1 second. Since the minimum time interval between the start of IP SLAs operations in a group operation is 1 second, the IP SLAs multiple operations scheduling functionality instead calculates how many operations it should start in each 1-second interval by dividing the number of operations by the schedule period (10 operations divided by 5 seconds). Therefore, as shown in Figure 3, two operations will be started every 1 second.

As the frequency is set to 10 in this example, each iteration of operation group 3 will start 10 seconds after the start of the previous iteration. However, this distribution is not optimal as there is a gap of 5 seconds (frequency minus schedule period) between the cycles.

If the number of operations getting scheduled does not equally divide into 1-second intervals, then the operations are equally divided at the start of the schedule period with the remaining operations to start at the last 1-second interval.

In the example shown in Figure 4, the ip sla group schedule 4 1-10 schedule-period 4 frequency 5 command is configured. This example schedules operation 1 to operation 10 within operation group 4. Operation group 4 has a schedule period of 4 seconds and a frequency of 5 seconds.

Figure 4 Number of IP SLAs Operations Is Greater Than the Schedule Period—Uneven Distribution

In this example, the IP SLAs multiple operations scheduling functionality calculates how many operations it should start in each 1-second interval by dividing the number of operations by the schedule period (10 operations divided by 4 seconds, which equals 2.5 operations every 1 second). Since the number of operations does not equally divide into 1-second intervals, this number will be rounded off to the next whole number (see Figure 4) with the remaining operations to start at the last 1-second interval.

IP SLAs Multiple Operations Scheduling with Scheduling Period Greater Than Frequency

As the frequency value in the ip sla group schedule configuration is the amount of time that passes before the schedule group is restarted, if the schedule period is greater than the frequency, there will be a period of time in which the operations in one iteration of an operation group overlap with the operations of the following iteration.

In the example shown in Figure 5, the ip sla group schedule 5 1-10 schedule-period 20 frequency 10 command is configured. This example schedules operation 1 to operation 10 within operation group 5. Operation group 5 has a schedule period of 20 seconds and a frequency of 10 seconds.

Figure 5 IP SLAs Group Scheduling with Schedule Period Greater Than Frequency

In this example, the first operation (operation 1) in operation group 5 will start at 0 seconds. All 10 operations in operation group 5 (operation 1 to operation 10) must be started in the schedule period of 20 seconds. The start time of each IP SLAs operation is evenly distributed over the schedule period by dividing the schedule period by the number of operations (20 seconds divided by 10 operations). Therefore, each operation will start 2 seconds after the previous operation.

In the first iteration of operation group 5, operation 1 starts at 0 seconds, and operation 10, the last operation in the operation group, starts at 18 seconds. Because the operation group is configured to restart every 10 seconds (frequency 10), the second iteration of operation group 5 starts again at 10 seconds, before the first iteration is completed. Therefore, an overlap of operations 6 to 10 of the first iteration occurs with operations 1 to 5 of the second iteration during the time period of 10 to 18 seconds (see Figure 5). Similarly, there is an overlap of operations 6 to 10 of the second iteration with operations 1 to 5 of the third iteration during the time period of 20 to 28 seconds.

In this example, the start time of operation 1 and operation 6 need not be at exactly the same time, but will be within the same 2-second interval.

The configuration described in this section is not recommended as you can configure multiple operations to start within the same 1-second interval by configuring the number of operations greater than the schedule period (see the Multiple Operations Scheduling When the Number of IP SLAs Operations Are Greater Than the Schedule Period).

IP SLAs Random Scheduler

The IP SLAs Random Scheduler feature is an enhancement to the existing IP SLAs Multioperation Scheduling feature introduced in Cisco IOS Release 12.3(8)T. The IP SLAs Multioperation Scheduling feature provides the capability to easily schedule multiple IP SLAs operations to begin at intervals equally distributed over a specified duration of time and to restart at a specified frequency. With the IP SLAs Random Scheduler feature, you can now schedule multiple IP SLAs operations to begin at random intervals uniformly distributed over a specified duration of time and to restart at uniformly distributed random frequencies within a specified frequency range. Random scheduling improves the statistical metrics for assessing network performance.

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Note The IP SLAs Random Scheduler feature is not in compliance with RFC2330, because it does not account for inter-packet randomness.

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The IP SLAs random scheduler option is disabled by default. To enable the random scheduler option, you must set a frequency range when configuring the ip sla group schedule command in global configuration mode. The group of operations restarts at uniformly distributed random frequencies within the specified frequency range. The following guidelines apply for setting the frequency range:

•The starting value of the frequency range should be greater than the timeout values of all the operations in the group operation.

•The starting value of the frequency range should be greater than the schedule period (amount of time for which the group operation is scheduled). This guideline ensures that the same operation does not get scheduled more than once within the schedule period.

The following guidelines apply if the random scheduler option is enabled:

•The individual operations in a group operation will be uniformly distributed to begin at random intervals over the schedule period.

•The group of operations restarts at uniformly distributed random frequencies within the specified frequency range.

•The minimum time interval between the start of each operation in a group operation is 100 milliseconds (0.1 seconds). If the random scheduler option is disabled, the minimum time interval is 1 second.

•Only one operation can be scheduled to begin at any given time. If the random scheduler option is disabled, multiple operations can begin at the same time.

•The first operation will always begin at 0 milliseconds of the schedule period.

•The order in which each operation in a group operation begins is random.

How to Schedule Multiple and Recurring IP SLAs Operations

This section contains the following tasks. Each task in the list is identified as either required or optional.

•Scheduling Multiple IP SLAs Operations (required)

•Enabling the IP SLAs Random Scheduler (optional)

•Verifying IP SLAs Multiple Operations Scheduling (optional)

Scheduling Multiple IP SLAs Operations

Perform this task to schedule multiple IP SLAs operations using a single command.

Prerequisites

Before scheduling a group of operations, you should configure all the IP SLAs operations that will be used in that group. For information about configuring specific IP SLAs operation types, see the Cisco IOS IP SLAs Features Roadmap.

Restrictions

•The frequency of all operations scheduled in the operation group should be the same.

•The operation ID numbers are limited to a maximum of 125 characters. Do not give large integer values as operation ID numbers.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip sla group schedule group-operation-number operation-id-numbers schedule-period schedule-period-range [ageout seconds] [frequency group-operation-frequency] [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}]

4. exit

5. show ip sla group schedule

6. show ip sla configuration

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	ip sla group schedule group-operation-number operation-id-numbers schedule-period schedule-period-range [ageout  seconds] [frequency group-operation-frequency] [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] Example: Router(config)# ip sla group schedule 1 3,4,6-9	Specifies an IP SLAs operation group number and the range of operation numbers to be scheduled in global configuration mode. •The group-operation-number argument identifies the IP SLAs operation ID to be group scheduled. •The operation-id-numbers argument specifies the number of operations that need to be group scheduled.
Step 4	exit Example: Router(config)# exit	Returns to the privileged EXEC mode.
Step 5	show ip sla group schedule Example: Router# show ip sla group schedule	(Optional) Displays the IP SLAs group schedule details.
Step 6	show ip sla configuration Example: Router# show ip sla configuration	(Optional) Displays the IP SLAs configuration details.

Enabling the IP SLAs Random Scheduler

Perform this task to schedule multiple IP SLAs operations to begin at random intervals uniformly distributed over a specified duration of time and to restart at uniformly distributed random frequencies within a specified frequency range.

Prerequisites

Before scheduling a group of operations, you should configure all the IP SLAs operations that will be used in that group. For information about configuring specific IP SLAs operation types, see the Cisco IOS IP SLAs Features Roadmap.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip sla group schedule group-operation-number operation-id-numbers schedule-period seconds [ageout seconds] [frequency [seconds | range random-frequency-range]] [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}]

4. exit

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	ip sla group schedule group-operation-number operation-id-numbers schedule-period seconds [ageout seconds] [frequency [seconds | range random-frequency-range]] [life {forever | seconds}] [start-time {hh:mm[:ss] [month day | day month] | pending | now | after hh:mm:ss}] Example: Router(config)# ip sla group schedule 2 1-3 schedule-period 50 frequency range 80-100	Specifies the scheduling parameters of a group of IP SLAs operations. •To enable the IP SLAs random scheduler option, you must configure the frequency range random-frequency-range keywords and argument.
Step 4	exit Example: Router(config)# exit	Exits global configuration mode and returns to privileged EXEC mode.

Verifying IP SLAs Multiple Operations Scheduling

To verify and analyze the scheduled operation, use the show ip sla statistics, show ip sla group schedule, and show ip sla configuration commands.

SUMMARY STEPS

1. show ip sla statistics

2. show ip sla group schedule

3. show ip sla configuration

DETAILED STEPS

	Command or Action	Purpose
Step 1	show ip sla statistics Example: Router# show ip sla statistics	(Optional) Displays the IP SLAs operation details.
Step 2	show ip sla group schedule Example: Router# show ip sla group schedule	(Optional) Displays the IP SLAs group schedule details.
Step 3	show ip sla configuration Example: Router# show ip sla configuration	(Optional) Displays the IP SLAs configuration details.

Examples

After you have scheduled the multiple IP SLAs operations, you can verify the latest operation details using the above show commands.

The following example schedules IP SLAs operations 1 through 20 in the operation group 1 with a schedule period of 60 seconds and a life value of 1200 seconds. By default, the frequency is equivalent to the schedule period. In this example, the start interval is 3 seconds (schedule period divided by number of operations).

Router# ip sla group schedule 1 1-20 schedule-period 60 life 1200

The following example shows the details of the scheduled multiple IP SLAs operation using the show ip sla group schedule command.

Router# show ip sla group schedule

Group Entry Number: 1

Probes to be scheduled: 1-20

Total number of probes: 20

Schedule period: 60

Group operation frequency: Equals schedule period

Status of entry (SNMP RowStatus): Active

Next Scheduled Start Time: Start Time already passed

Life (seconds): 1200

Entry Ageout (seconds): never

The following example shows the details of the scheduled multiple IP SLAs operation using the show ip sla configuration command. The last line in the example indicates that the IP SLAs operations are multiple scheduled (TRUE).

Router# show ip sla configuration 1

Entry number: 1

Owner: 

Tag: 

Type of operation to perform: udpEcho

Target address: 10.2.31.121

Source address: 0.0.0.0

Target port: 9001

Source port: 0

Request size (ARR data portion): 16

Operation timeout (milliseconds): 5000

Type Of Service parameters: 0x0

Verify data: No

Data pattern: 

Vrf Name: 

Control Packets: enabled

Operation frequency (seconds): 60

Next Scheduled Start Time: Start Time already passed

Life (seconds): 1200

Entry Ageout (seconds): never

Recurring (Starting Everyday): FALSE

Status of entry (SNMP RowStatus): Active

Threshold (milliseconds): 5000

Number of statistic hours kept: 2

Number of statistic distribution buckets kept: 1

Statistic distribution interval (milliseconds): 20

Enhanced History:

Number of history Lives kept: 0

Number of history Buckets kept: 15

History Filter Type: None

Group Scheduled : TRUE

The following example shows the latest operation start time of the scheduled multiple IP SLAs operation, when the operations are scheduled at equal intervals, using the show ip sla statistics command:

Router# show ip sla statistics | include Latest operation start time

Latest operation start time: *03:06:21.760 UTC Tue Oct 21 2003

Latest operation start time: *03:06:24.754 UTC Tue Oct 21 2003

Latest operation start time: *03:06:27.751 UTC Tue Oct 21 2003

Latest operation start time: *03:06:30.752 UTC Tue Oct 21 2003

Latest operation start time: *03:06:33.754 UTC Tue Oct 21 2003

Latest operation start time: *03:06:36.755 UTC Tue Oct 21 2003

Latest operation start time: *03:06:39.752 UTC Tue Oct 21 2003

Latest operation start time: *03:06:42.753 UTC Tue Oct 21 2003

Latest operation start time: *03:06:45.755 UTC Tue Oct 21 2003

Latest operation start time: *03:06:48.752 UTC Tue Oct 21 2003

Latest operation start time: *03:06:51.753 UTC Tue Oct 21 2003

Latest operation start time: *03:06:54.755 UTC Tue Oct 21 2003

Latest operation start time: *03:06:57.752 UTC Tue Oct 21 2003

Latest operation start time: *03:07:00.753 UTC Tue Oct 21 2003

Latest operation start time: *03:07:03.754 UTC Tue Oct 21 2003

Latest operation start time: *03:07:06.752 UTC Tue Oct 21 2003

Latest operation start time: *03:07:09.752 UTC Tue Oct 21 2003

Latest operation start time: *03:07:12.753 UTC Tue Oct 21 2003

Latest operation start time: *03:07:15.755 UTC Tue Oct 21 2003

Latest operation start time: *03:07:18.752 UTC Tue Oct 21 2003

Configuration Examples for Multioperation Scheduling of IP SLAs Operations

This section provides the following configuration examples:

•Scheduling Multiple IP SLAs Operations: Example

•Enabling the IP SLAs Random Scheduler: Example

Scheduling Multiple IP SLAs Operations: Example

The following example schedules IP SLAs operations 1 to 10 in the operation group 1 with a schedule period of 20 seconds. By default, the frequency is equivalent to the schedule period.

Router# ip sla group schedule 1 1-10 schedule-period 20

The following example shows the details of the scheduled multiple IP SLAs operation using the show ip sla group schedule command. The last line in the example indicates that the IP SLAs operations are multiple scheduled (TRUE).

Router# show ip sla group schedule

Multi-Scheduling Configuration:

Group Entry Number: 1

Probes to be scheduled: 1-10

Schedule period :20

Group operation frequency: 20

Multi-scheduled: TRUE

Enabling the IP SLAs Random Scheduler: Example

The following example shows how to schedule IP SLAs operations 1 to 3 as a group (identified as group 2). In this example, the operations are scheduled to begin at uniformly distributed random intervals over a schedule period of 50 seconds. The first operation is scheduled to start immediately. The interval is chosen from the specified range upon every invocation of the probe. The random scheduler option is enabled and the uniformly distributed random frequencies at which the group of operations will restart is chosen within the range of 80-100 seconds.

ip sla group schedule 2 1-3 schedule-period 50 frequency range 80-100 start-time now

Where to Go Next

For information about other types of IP SLAs operations and IP SLAs features, see the Cisco IOS IP SLAs Features Roadmap.

Additional References

The following sections provide references related to IP SLAs group scheduling.

Related Documents

Related Topic	Document Title
Cisco IOS IP SLAs command-line interface enhancements	Cisco IOS IP Service Level Agreements Command Line Interface, Cisco white paper
Cisco IOS IP SLAs commands	Cisco IOS IP SLAs Command Reference

Standards

Standards	Title
No new or modified standards are supported by this feature.	—

MIBs

MIBs	MIBs Link
CISCO-RTTMON-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.	—

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/techsupport

Feature Information for Multioperation Scheduling of IP SLAs Operations

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

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Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

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Table 1 Feature Information for IP SLAs Multiple Operation Scheduling 

Feature Name	Releases	Feature Information
IP SLAs Multioperation Scheduler	12.3(14)T, 12.2(31)SB2, 12.2(33)SRB1, 12.2(33)SXH, Cisco IOS XE Release 2.1	The IP SLAs Multioperation Scheduler feature provides a highly scalable infrastructure for Cisco IOS IP SLAs by allowing you to schedule multiple IP SLAs operations using a single command.
IP SLAs Random Scheduler	12.4(2)T, 12.2(33)SB, Cisco IOS XE Release 2.1, 12.2(33)SXI	The IP SLAs Random Scheduler feature provides the capability to schedule multiple IP SLAs operations to begin at random intervals uniformly distributed over a specified duration of time and to restart at uniformly distributed random frequencies within a specified frequency range. The following sections provide information about this feature: •IP SLAs Random Scheduler •Enabling the IP SLAs Random Scheduler •Enabling the IP SLAs Random Scheduler: Example

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