- IP SLAs Overview
- Configuring Auto IP SLAs in IP SLAs Engine 3.0
- Configuring IP SLA - Percentile Support for Filtering Outliers
- Configuring IP SLAs Video Operations
- Configuring IP SLAs UDP Jitter Operations
- IP SLA - Support for OnDemand UDP Probes
- Configuring IP SLAs UDP Jitter Operations for VoIP
- IP SLAs Multicast Support
- Configuring IP SLAs LSP Health Monitor Operations
- Configuring IP SLAs for Metro-Ethernet
- Configuring Cisco IP SLAs ICMP Jitter Operations
- Configuring RTP-Based VoIP Operations
- Configuring VoIP Gatekeeper Registration Delay Operations
- Configuring VoIP Call Setup Monitoring
- Configuring IP SLAs UDP Echo Operations
- Configuring IP SLAs HTTP Operations
- Configuring IP SLAs TCP Connect Operations
- Configuring IP SLAs ICMP Echo Operations
- Configuring IP SLAs ICMP Path Echo Operations
- Configuring IP SLAs ICMP Path Jitter Operations
- Configuring IP SLAs FTP Operations
- Configuring IP SLAs DNS Operations
- Configuring IP SLAs DHCP Operations
- Configuring IP SLAs DLSw+ Operations
- Configuring an IP SLAs Multioperation Scheduler
- Configuring Proactive Threshold Monitoring for IP SLAs Operations
- IP SLAs TWAMP Responder
IP SLAs Configuration Guide, Cisco IOS Release 15M&T
Bias-Free Language
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- Updated:
- April 25, 2018
Chapter: Configuring IP SLA - Percentile Support for Filtering Outliers
- Finding Feature Information
- Information About IP SLA - Percentile Support for Filtering Outliers
- How to Configure IP SLA - Percentile Support for Filtering Outliers
- Configuration Examples for IP SLA - Percentile Support for Filtering Outliers
- Additional References for IP SLA - Percentile Support for Filtering Outliers
- Feature Information for IP SLA - Percentile Support for Filtering Outliers
Configuring IP SLA - Percentile Support for Filtering Outliers
This module describes how to configure the percentile option for IP SLAs to examine a set of network measurements that are within a specified percentile of the return packets. This feature improves Cisco IP Service Level Agreements (SLAs) by providing the capability to measure round-trip times within a percentile, such as the 95th percentile of RTT, in order to examine a set of measurements that are 95% faster and 5% slower.
- Finding Feature Information
- Information About IP SLA - Percentile Support for Filtering Outliers
- How to Configure IP SLA - Percentile Support for Filtering Outliers
- Configuration Examples for IP SLA - Percentile Support for Filtering Outliers
- Additional References for IP SLA - Percentile Support for Filtering Outliers
- Feature Information for IP SLA - Percentile Support for Filtering Outliers
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.
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.
Information About IP SLA - Percentile Support for Filtering Outliers
Percentile Measurements
The IP SLA- Percentile Support for Filtering Outliers feature enables IP SLAs to calculate min/average/max values for all packets, excluding those with the highest x% measured value. For example, if you have a ten-packet probe with nine 1-ms RTT values and one 50-ms RTT value, the percentile will exclude the outlier (50-ms) and report a min/avg/max value of 1/1/1, not 1/5/50.
IP SLAs reactions are configured to trigger when a monitored value exceeds or falls below a specified level. If IP SLAs measures too high or too low for any configured reaction, IP SLAs can generate a notification to a network management application or trigger another IP SLA operation to gather more data. The percentile reactions work the same way except that the monitored value is the percentile min/max/average. A count is keep of all the packets that violate the threshold value and at the end of the operation, that value is subtracted from the total packets received, then divided by the total, and a success ratio is generated. This value is referenced by a new reaction type that generates a notification when a percentage ratio is not met. For information, see the ip sla reaction-configuration command in the IP SLAs Command Reference.
How to Configure IP SLA - Percentile Support for Filtering Outliers
Configuring the IP SLAs Responder on a Destination Device
 Note | A responder should not configure a permanent port for a sender. If the responder configures a permanent port for a sender, even if the packets are successfully sent (no timeout or packet-loss issues), the jitter value is zero. |
DETAILED STEPS
Configuring an IP SLAs Operation Using the Percentile Option
- The IP SLAs operation to be configured for percentile support must be configured on the source device. For configuration information, see the appropriate module in the IP SLAs Configuration Guide. The percentile option can be configured for the following IP SLAs operations:
Ethernet jitter—See the “Manually Configuring an IP SLAs Ethernet Ping or Jitter Operation on the Source Device” section of the “Configuring IP SLAs for Metro-Ethernet” module.
ICMP jitter—See the “Configuring Cisco IP SLAs ICMP Operations” module.
UDP jitter—See the “IP SLAs UDP Jitter Operations” module.
For a UDP jitter operation, an IP SLAs responder must be configured on the destination device. For configuration information, see the “Configuring an IP SLAs Responder on the Destination Device” section.
1.
enable
2.
configure terminal
3.
ip sla operation-number
4.
percentile {jitteravg | jitterds | jittersd | owds | owsd | rtt} percent
5.
end
DETAILED STEPS
Scheduling IP SLAs Operations
- ip sla schedule operation-number [life {forever | seconds}] [start-time {[hh:mm:ss] [month day | day month] | pending | now | after hh:mm:ss}] [ageout seconds] [recurring]
- ip sla group schedule group-operation-number operation-id-numbers {schedule-period schedule-period-range | schedule-together} [ageout seconds] frequency group-operation-frequency [life {forever | seconds}] [start-time {hh:mm [:ss] [month day | day month] | pending | now | after hh:mm [:ss]}]
1.
enable
2.
configure
terminal
3.
Enter one of
the following commands:
4.
end
5.
show
ip
sla
group
schedule
6.
show
ip
sla
configuration
DETAILED STEPS
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
enable
Example: Device> enable |
Enables privileged EXEC mode. |
| Step 2 |
configure
terminal
Example: Device# configure terminal |
Enters global configuration mode. |
| Step 3 | Enter one of
the following commands:
Example: Device(config)# ip sla schedule 10 life forever start-time now Device(config)# ip sla group schedule 10 schedule-period frequency Device(config)# ip sla group schedule 1 3,4,6-9 life forever start-time now Device(config)# ip sla schedule 1 3,4,6-9 schedule-period 50 frequency range 80-100 | |
| Step 4 |
end
Example: Device(config)# end |
Exits global configuration mode and returns to privileged EXEC mode. |
| Step 5 |
show
ip
sla
group
schedule
Example: Device# show ip sla group schedule |
(Optional) Displays IP SLAs group schedule details. |
| Step 6 |
show
ip
sla
configuration
Example: Device# show ip sla configuration |
(Optional) Displays IP SLAs configuration details. |
Troubleshooting Tips
If the IP Service Level Agreements (SLAs) operation is not running and not generating statistics, add the verify-data command to the configuration (while configuring in IP SLA configuration mode) to enable data verification. When data verification is enabled, each operation response is checked for corruption. Use the verify-data command with caution during normal operations because it generates unnecessary overhead.
Use the debug ip sla trace and debug ip sla error commands to help troubleshoot issues with an IP SLAs operation.
What to Do Next
To add proactive threshold conditions and reactive triggering for generating traps (or for starting another operation) to an IP Service Level Agreements (SLAs) operation, see the “Configuring Proactive Threshold Monitoring” section.
Verifying IP SLAs Operations
Perform this task to display and interpret the results of an IP SLAs operation. Check the output for fields that correspond to the criteria in your service level agreement to determine whether the service metrics are acceptable.
1.
enable
2.
show ip sla statistics
DETAILED STEPS
Configuration Examples for IP SLA - Percentile Support for Filtering Outliers
Example: Configuring IP SLA - Percentile Support for Filtering Outliers
The following example shows how to configure an IP SLAs ICMP jitter operation with the percentile option:
ip sla 1 icmp-jitter 192.168.0.129 interval 40 num-packets 100 source-ip 10.1.2.34 percentile jitteravg 95 ! ip sla reaction-configuration 1 react jitterAvgpct threshold-value 5 2 action-type trap threshold-type immediate ! ip sla schedule 1 start-time now life forever
Additional References for IP SLA - Percentile Support for Filtering Outliers
Related Documents
| Related Topic | Document Title |
|---|---|
|
Cisco IOS commands |
|
|
Cisco IOS IP SLAs commands |
|
Cisco IP SLAs configuration tasks |
IP SLAs Configuration Guide |
Standards and RFCs
| Standard/RFC | Title |
|---|---|
|
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
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. |
Feature Information for IP SLA - Percentile Support for Filtering Outliers
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.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
IP SLA - Percentile Support for Filtering Outliers |
Cisco IOS 15.3(2)T |
This feature improves Cisco IP Service Level Agreements (SLAs) by providing the capability to measure round-trip times within a percentile, such as the 95th percentile of RTT, in order to examine a set of measurements that are 95% faster and 5% slower. The following commands were introduced or modified: ip sla reaction-configuration, percentile, show ip sla statistics |
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