Catalyst 3750-E and Catalyst 3560-E Switch Software Configuration Guide, Cisco IOS Release 15.0(2)SE and Later
Configuring Cisco IOS IP SLAs Operations
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Configuring Cisco IOS IP SLAs Operations

Table Of Contents

Configuring Cisco IOS IP SLAs Operations

Understanding Cisco IOS IP SLAs

Using Cisco IOS IP SLAs to Measure Network Performance

IP SLAs Responder and IP SLAs Control Protocol

Response Time Computation for IP SLAs

IP SLAs Operation Scheduling

IP SLAs Operation Threshold Monitoring

Configuring IP SLAs Operations

Default Configuration

Configuration Guidelines

Configuring the IP SLAs Responder

Analyzing IP Service Levels by Using the UDP Jitter Operation

Analyzing IP Service Levels by Using the ICMP Echo Operation

Monitoring IP SLAs Operations


Configuring Cisco IOS IP SLAs Operations


This chapter describes how to use Cisco IOS IP Service Level Agreements (SLAs) on the Catalyst 3750-E or 3560-E switch. Cisco IP SLAs is a part of Cisco IOS software that allows Cisco customers to analyze IP service levels for IP applications and services by using active traffic monitoring—the generation of traffic in a continuous, reliable, and predictable manner—for measuring network performance. With Cisco IOS IP SLAs, service provider customers can measure and provide service level agreements, and enterprise customers can verify service levels, verify outsourced service level agreements, and understand network performance. Cisco IOS IP SLAs can perform network assessments, verify quality of service (QoS), ease the deployment of new services, and assist with network troubleshooting.

Switches running the IP base feature set support only IP SLAs responder functionality and must be configured with another device that supports full IP SLAs functionality, for example, a Catalyst 3750E switch running the IP services feature set.


Note Catalyst 3750-EUnless otherwise noted, the term switch refers to a Catalyst 3750-E or 3560-E standalone switch and to a Catalyst 3750-E switch stack.


Beginning with Cisco IOS 12.2(58)SE, the switch also supports the Built-in Traffic Simulator using Cisco IOS IP SLAs video operations to generate synthetic traffic for a variety of video applications, such as Telepresence, IPTV and IP video surveillance camera. You can use the simulator tool:

for network assessment before deploying applications that have stringent network performance requirements.

along with the Cisco Mediatrace for post-deployment troubleshooting for any network related performance issues.

The traffic simulator includes a sophisticated scheduler that allows the user to run several tests simultaneously or periodically and over extended time periods. For information on configuring this feature, see the Configuring Cisco IOS IP SLAs Video Operations document at:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipsla/configuration/12-2se/Configuring_IP_SLAs_Video_Operations.html

For more information about IP SLAs, see the Cisco IOS IP SLAs Configuration Guide, Release 12.4T:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html

For command syntax information, see the command reference:
http://www.cisco.com/en/US/docs/ios/ipsla/command/reference/sla_book.html

This chapter consists of these sections:

Understanding Cisco IOS IP SLAs

Configuring IP SLAs Operations

Monitoring IP SLAs Operations

Understanding Cisco IOS IP SLAs

Cisco IOS IP SLAs sends data across the network to measure performance between multiple network locations or across multiple network paths. It simulates network data and IP services and collects network performance information in real time. Cisco IOS IP SLAs generates and analyzes traffic either between Cisco IOS devices or from a Cisco IOS device to a remote IP device such as a network application server. Measurements provided by the various Cisco IOS IP SLAs operations can be used for troubleshooting, for problem analysis, and for designing network topologies.

Depending on the specific Cisco IOS IP SLAs operation, various network performance statistics are monitored within the Cisco device and stored in both command-line interface (CLI) and Simple Network Management Protocol (SNMP) MIBs. IP SLAs packets have configurable IP and application layer options such as source and destination IP address, User Datagram Protocol (UDP)/TCP port numbers, a type of service (ToS) byte (including Differentiated Services Code Point [DSCP] and IP Prefix bits), Virtual Private Network (VPN) routing/forwarding instance (VRF), and URL web address.

Because Cisco IP SLAs is Layer 2 transport independent, you can configure end-to-end operations over disparate networks to best reflect the metrics that an end user is likely to experience. IP SLAs collects a unique subset of these performance metrics:

Delay (both round-trip and one-way)

Jitter (directional)

Packet loss (directional)

Packet sequencing (packet ordering)

Path (per hop)

Connectivity (directional)

Server or website download time

Because Cisco IOS IP SLAs is SNMP-accessible, it can also be used by performance-monitoring applications like CiscoWorks Internetwork Performance Monitor (IPM) and other third-party Cisco partner performance management products. You can find more details about network management products that use Cisco IOS IP SLAs:
http://www.cisco.com/go/ipsla

Using IP SLAs can provide these benefits:

Service-level agreement monitoring, measurement, and verification.

Network performance monitoring

Measures the jitter, latency, or packet loss in the network.

Provides continuous, reliable, and predictable measurements.

IP service network health assessment to verify that the existing QoS is sufficient for new IP services.

Edge-to-edge network availability monitoring for proactive verification and connectivity testing of network resources (for example, shows the network availability of an NFS server used to store business critical data from a remote site).

Troubleshooting of network operation by providing consistent, reliable measurement that immediately identifies problems and saves troubleshooting time.

Multiprotocol Label Switching (MPLS) performance monitoring and network verification (if the switch supports MPLS)

This section includes this information about IP SLAs functionality:

Using Cisco IOS IP SLAs to Measure Network Performance

IP SLAs Responder and IP SLAs Control Protocol

Response Time Computation for IP SLAs

IP SLAs Operation Scheduling

IP SLAs Operation Threshold Monitoring

Using Cisco IOS IP SLAs to Measure Network Performance

You can use IP SLAs to monitor the performance between any area in the network—core, distribution, and edge—without deploying a physical probe. It uses generated traffic to measure network performance between two networking devices. Figure 44-1 shows how IP SLAs begins when the source device sends a generated packet to the destination device. After the destination device receives the packet, depending on the type of IP SLAs operation, it responds with time-stamp information for the source to make the calculation on performance metrics. An IP SLAs operation performs a network measurement from the source device to a destination in the network using a specific protocol such as UDP.

Figure 44-1 Cisco IOS IP SLAs Operation

To implement IP SLAs network performance measurement, you need to perform these tasks:

1. Enable the IP SLAs responder, if required.

2. Configure the required IP SLAs operation type.

3. Configure any options available for the specified operation type.

4. Configure threshold conditions, if required.

5. Schedule the operation to run, then let the operation run for a period of time to gather statistics.

6. Display and interpret the results of the operation using the Cisco IOS CLI or a network management system (NMS) system with SNMP.

For more information about IP SLAs operations, see the operation-specific chapters in the Cisco IOS IP SLAs Configuration Guide:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html

The switch does not support Voice over IP (VoIP) service levels using the gatekeeper registration delay operations measurements. Before configuring any IP SLAs application, you can use the show ip sla application privileged EXEC command to verify that the operation type is supported on your software image.

IP SLAs Responder and IP SLAs Control Protocol

The IP SLAs responder is a component embedded in the destination Cisco device that allows the system to anticipate and respond to IP SLAs request packets. The responder provides accurate measurements without the need for dedicated probes. The responder uses the Cisco IOS IP SLAs Control Protocol to provide a mechanism through which it can be notified on which port it should listen and respond. Only a Cisco IOS device can be a source for a destination IP SLAs Responder.


Note The IP SLAs responder can be a Cisco IOS Layer 2, responder-configurable switch, such as a Catalyst 2960 switch. The responder does not need to support full IP SLAs functionality.


Figure 44-1 shows where the Cisco IOS IP SLAs responder fits in the IP network. The responder listens on a specific port for control protocol messages sent by an IP SLAs operation. Upon receipt of the control message, it enables the specified UDP or TCP port for the specified duration. During this time, the responder accepts the requests and responds to them. It disables the port after it responds to the IP SLAs packet, or when the specified time expires. MD5 authentication for control messages is available for added security.

You do not need to enable the responder on the destination device for all IP SLAs operations. For example, a responder is not required for services that are already provided by the destination router (such as Telnet or HTTP). You cannot configure the IP SLAs responder on non-Cisco devices and Cisco IOS IP SLAs can send operational packets only to services native to those devices.

Response Time Computation for IP SLAs

Switches and routers can take tens of milliseconds to process incoming packets due to other high priority processes. This delay affects the response times because the test-packet reply might be in a queue while waiting to be processed. In this situation, the response times would not accurately represent true network delays. IP SLAs minimizes these processing delays on the source device as well as on the target device (if the responder is being used) to determine true round-trip times. IP SLAs test packets use time stamping to minimize the processing delays.

When the IP SLAs responder is enabled, it allows the target device to take time stamps when the packet arrives on the interface at interrupt level and again just as it is leaving, eliminating the processing time. This time stamping is made with a granularity of sub-milliseconds (ms).

Figure 44-2 demonstrates how the responder works. Four time stamps are taken to make the calculation for round-trip time. At the target router, with the responder functionality enabled, time stamp 2 (TS2) is subtracted from time stamp 3 (TS3) to produce the time spent processing the test packet as represented by delta. This delta value is then subtracted from the overall round-trip time. Notice that the same principle is applied by IP SLAs on the source router where the incoming time stamp 4 (TS4) is also taken at the interrupt level to allow for greater accuracy.

Figure 44-2 Cisco IOS IP SLAs Responder Time Stamping

An additional benefit of the two time stamps at the target device is the ability to track one-way delay, jitter, and directional packet loss. Because much network behavior is asynchronous, it is critical to have these statistics. However, to capture one-way delay measurements, you must configure both the source router and target router with Network Time Protocol (NTP) so that the source and target are synchronized to the same clock source. One-way jitter measurements do not require clock synchronization.

IP SLAs Operation Scheduling

When you configure an IP SLAs operation, you must schedule the operation to begin capturing statistics and collecting error information. You can schedule an operation to start immediately or to start at a certain month, day, and hour. You can use the pending option to set the operation to start at a later time. The pending option is an internal state of the operation that is visible through SNMP. The pending state is also used when an operation is a reaction (threshold) operation waiting to be triggered. You can schedule a single IP SLAs operation or a group of operations at one time.

You can schedule several IP SLAs operations by using a single command through the Cisco IOS CLI or the CISCO RTTMON-MIB. Scheduling the operations to run at evenly distributed times allows you to control the amount of IP SLAs monitoring traffic. This distribution of IP SLAs operations helps minimize the CPU utilization and thus improves network scalability.

For more details about the IP SLAs multioperations scheduling functionality, see the "IP SLAs—Multiple Operation Scheduling" chapter of the Cisco IOS IP SLAs Configuration Guide:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html

IP SLAs Operation Threshold Monitoring

To support successful service level agreement monitoring, you must have mechanisms that notify you immediately of any possible violation. IP SLAs can send SNMP traps that are triggered by events such as these:

Connection loss

Timeout

Round-trip time threshold

Average jitter threshold

One-way packet loss

One-way jitter

One-way mean opinion score (MOS)

One-way latency

An IP SLAs threshold violation can also trigger another IP SLAs operation for further analysis. For example, the frequency could be increased or an ICMP path echo or ICMP path jitter operation could be initiated for troubleshooting.

Determining the type of threshold and the level to set can be complex, and depends on the type of IP service being used in the network. For more details on using thresholds with Cisco IOS IP SLAs operations, see the "IP SLAs—Proactive Threshold Monitoring" chapter of the Cisco IOS IP SLAs Configuration Guide.

Configuring IP SLAs Operations

This section does not include configuration information for all available operations as the configuration information details are included in the Cisco IOS IP SLAs Configuration Guide. It does include several operations as examples, including configuring the responder, configuring UDP jitter operation, which requires a responder, and configuring ICMP echo operation, which does not require a responder. For details about configuring other operations, see he Cisco IOS IP SLAs Configuration Guide:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html

This section includes this information:

Default Configuration

Configuration Guidelines

Configuring the IP SLAs Responder

Analyzing IP Service Levels by Using the UDP Jitter Operation

Analyzing IP Service Levels by Using the ICMP Echo Operation

Default Configuration

No IP SLAs operations are configured.

Configuration Guidelines

For information on the IP SLAs commands, see the Cisco IOS IP SLAs Command Reference, Release 12.4T command reference:
http://www.cisco.com/en/US/docs/ios/ipsla/command/reference/sla_book.html

For detailed descriptions and configuration procedures, see the Cisco IOS IP SLAs Configuration Guide, Release 12.4T L:
http://www.cisco.com/en/US/docs/ios/ipsla/configuration/guide/12_4t/sla_12_4t_book.html

Note that not all of the IP SLAs commands or operations described in this guide are supported on the switch. The switch supports IP service level analysis by using UDP jitter, UDP echo, HTTP, TCP connect, ICMP echo, ICMP path echo, ICMP path jitter, FTP, DNS, and DHCP, as well as multiple operation scheduling and proactive threshold monitoring. It does not support VoIP service levels using the gatekeeper registration delay operations measurements.

Before configuring any IP SLAs application, you can use the show ip sla application privileged EXEC command to verify that the operation type is supported on your software image. This is an example of the output from the command:

Switch# show ip sla application
        IP SLAs
Version: 2.2.0 Round Trip Time MIB, Infrastructure Engine-II
Time of last change in whole IP SLAs: 22:17:39.117 UTC Fri Jun
Estimated system max number of entries: 15801
 
   
Estimated number of configurable operations: 15801
Number of Entries configured  : 0
Number of active Entries      : 0
Number of pending Entries     : 0
Number of inactive Entries    : 0
 
   
        Supported Operation Types
Type of Operation to Perform: 802.1agEcho
Type of Operation to Perform: 802.1agJitter
Type of Operation to Perform: dhcp
Type of Operation to Perform: dns
Type of Operation to Perform: echo
Type of Operation to Perform: ftp
Type of Operation to Perform: http
Type of Operation to Perform: jitter
Type of Operation to Perform: pathEcho
Type of Operation to Perform: pathJitter
Type of Operation to Perform: tcpConnect
Type of Operation to Perform: udpEcho
 
   
IP SLAs low memory water mark: 21741224

Configuring the IP SLAs Responder

The IP SLAs responder is available only on Cisco IOS software-based devices, including some Layer 2 switches that do not support full IP SLAs functionality, such as a Catalyst 2960 switch.

Beginning in privileged EXEC mode, follow these steps to configure the IP SLAs responder on the target device (the operational target):

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

ip sla responder {tcp-connect | udp-echo} ipaddress ip-address port port-number

Configure the switch as an IP SLAs responder.

The keywords have these meanings:

tcp-connect—Enable the responder for TCP connect operations.

udp-echo—Enable the responder for User Datagram Protocol (UDP) echo or jitter operations.

ipaddress ip-address—Enter the destination IP address.

port port-number—Enter the destination port number.

Note The IP address and port number must match those configured on the source device for the IP SLAs operation.

Step 3 

end

Return to privileged EXEC mode.

Step 4 

show ip sla responder

Verify the IP SLAs responder configuration on the device.

Step 5 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable the IP SLAs responder, enter the no ip sla responder global configuration command. This example shows how to configure the device as a responder for the UDP jitter IP SLAs operation in the next procedure:

Switch(config)# ip sla responder udp-echo 172.29.139.134 5000 

Analyzing IP Service Levels by Using the UDP Jitter Operation

Jitter means interpacket delay variance. When multiple packets are sent consecutively 10 ms apart from source to destination, if the network is behaving correctly, the destination should receive them 10 ms apart. But if there are delays in the network (like queuing, arriving through alternate routes, and so on) the arrival delay between packets might be more than or less than 10 ms with a positive jitter value meaning that the packets arrived more than 10 ms apart. If the packets arrive 12 ms apart, positive jitter is 2 ms; if the packets arrive 8 ms apart, negative jitter is 2 ms. For delay-sensitive networks, positive jitter values are undesirable, and a jitter value of 0 is ideal.

In addition to monitoring jitter, the IP SLAs UDP jitter operation can be used as a multipurpose data gathering operation. The packets IP SLAs generates carry packet sending and receiving sequence information and sending and receiving time stamps from the source and the operational target. Based on these, UDP jitter operations measure this data:

Per-direction jitter (source to destination and destination to source)

Per-direction packet-loss

Per-direction delay (one-way delay)

Round-trip delay (average round-trip time)

Because the paths for the sending and receiving of data can be different (asymmetric), you can use the per-direction data to more readily identify where congestion or other problems are occurring in the network.

The UDP jitter operation generates synthetic (simulated) UDP traffic and sends a number of UDP packets, each of a specified size, sent a specified number of milliseconds apart, from a source router to a target router, at a given frequency. By default, ten packet-frames, each with a payload size of 10 bytes are generated every 10 ms, and the operation is repeated every 60 seconds. You can configure each of these parameters to best simulate the IP service you want to provide.

To provide accurate one-way delay (latency) measurements, time synchronization, such as that provided by NTP, is required between the source and the target device. Time synchronization is not required for the one-way jitter and packet loss measurements. If the time is not synchronized between the source and target devices, one-way jitter and packet loss data is returned, but values of 0 are returned for the one-way delay measurements provided by the UDP jitter operation


Note Before you configure a UDP jitter operation on the source device, you must enable the IP SLAs responder on the target device (the operational target).


Beginning in privileged EXEC mode, follow these steps to configure UDP jitter operation on the source device:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

ip sla operation-number

Create an IP SLAs operation, and enter IP SLAs configuration mode.

Step 3 

udp-jitter {destination-ip-address | destination-hostname} destination-port [source-ip {ip-address | hostname}] [source-port port-number] [control {enable | disable}] [num-packets number-of-packets] [interval interpacket-interval]

Configure the IP SLAs operation as a UDP jitter operation, and enter UDP jitter configuration mode.

destination-ip-address | destination-hostname—Specify the destination IP address or hostname.

destination-port—Specify the destination port number in the range from 1 to 65535.

(Optional) source-ip {ip-address | hostname}Specify the source IP address or hostname. When a source IP address or hostname is not specified, IP SLAs chooses the IP address nearest to the destination

(Optional) source-port port-number—Specify the source port number in the range from 1 to 65535. When a port number is not specified, IP SLAs chooses an available port.

(Optional) control—Enable or disable sending of IP SLAs control messages to the IP SLAs responder. By default, IP SLAs control messages are sent to the destination device to establish a connection with the IP SLAs responder

(Optional) num-packets number-of-packets—Enter the number of packets to be generated. The range is 1 to 6000; the default is 10.

(Optional) interval inter-packet-interval—Enter the interval between sending packets in milliseconds. The range is 1 to 6000; the default value is 20 ms.

Step 4 

frequency seconds

(Optional) Set the rate at which a specified IP SLAs operation repeats. The range is from 1 to 604800 seconds; the default is 60 seconds.

Step 5 

exit

Exit UDP jitter configuration mode, and return to global configuration mode.

Step 6 

ip sla monitor schedule operation-number [life {forever | seconds}] [start-time {hh:mm [:ss] [month day | day month] | pending | now | after hh:mm:ss] [ageout seconds] [recurring]

Configure the scheduling parameters for an individual IP SLAs operation.

operation-number—Enter the RTR entry number.

(Optional) life—Set the operation to run indefinitely (forever) or for a specific number of seconds. The range is from 0 to 2147483647. The default is 3600 seconds (1 hour).

(Optional) start-time—Enter the time for the operation to begin collecting information:

To start at a specific time, enter the hour, minute, second (in 24-hour notation), and day of the month. If no month is entered, the default is the current month.

Enter pending to select no information collection until a start time is selected.

Enter now to start the operation immediately.

Enter after hh:mm:ss to show that the operation should start after the entered time has elapsed.

(Optional) ageout seconds—Enter the number of seconds to keep the operation in memory when it is not actively collecting information. The range is 0 to 2073600 seconds, the default is 0 seconds (never ages out).

(Optional) recurring—Set the operation to automatically run every day.

Step 7 

end

Return to privileged EXEC mode.

Step 8 

show ip sla configuration [operation-number]

(Optional) Display configuration values, including all defaults for all IP SLAs operations or a specified operation.

Step 9 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable the IP SLAs operation, enter the no ip sla operation-number global configuration command. This example shows how to configure a UDP jitter IP SLAs operation:

Switch(config)# ip sla 10 
Switch(config-ip-sla)# udp-jitter 172.29.139.134 5000 
Switch(config-ip-sla-jitter)# frequency 30 
Switch(config-ip-sla-jitter)# exit 
Switch(config)# ip sla schedule 5 start-time now life forever 
Switch(config)# end
Switch# show ip sla configuration 10
IP SLAs, Infrastructure Engine-II.
 
   
Entry number: 10
Owner:
Tag:
Type of operation to perform: udp-jitter
Target address/Source address: 1.1.1.1/0.0.0.0
Target port/Source port: 2/0
Request size (ARR data portion): 32
Operation timeout (milliseconds): 5000
Packet Interval (milliseconds)/Number of packets: 20/10
Type Of Service parameters: 0x0
Verify data: No
Vrf Name:
Control Packets: enabled
Schedule:
    Operation frequency (seconds): 30
    Next Scheduled Start Time: Pending trigger
    Group Scheduled : FALSE
    Randomly Scheduled : FALSE
    Life (seconds): 3600
    Entry Ageout (seconds): never
    Recurring (Starting Everyday): FALSE
    Status of entry (SNMP RowStatus): notInService
Threshold (milliseconds): 5000
Distribution Statistics:
    Number of statistic hours kept: 2
    Number of statistic distribution buckets kept: 1
    Statistic distribution interval (milliseconds): 20
Enhanced History:

Analyzing IP Service Levels by Using the ICMP Echo Operation

The ICMP echo operation measures end-to-end response time between a Cisco device and any devices using IP. Response time is computed by measuring the time taken between sending an ICMP echo request message to the destination and receiving an ICMP echo reply. Many customers use IP SLAs ICMP-based operations, in-house ping testing, or ping-based dedicated probes for response time measurements between the source IP SLAs device and the destination IP device. The IP SLAs ICMP echo operation conforms to the same specifications as ICMP ping testing, and the two methods result in the same response times.


Note This operation does not require the IP SLAs responder to be enabled.


Beginning in privileged EXEC mode, follow these steps to configure an ICMP echo operation on the source device:

 
Command
Purpose

Step 1 

configure terminal

Enter global configuration mode.

Step 2 

ip sla operation-number

Create an IP SLAs operation and enter IP SLAs configuration mode.

Step 3 

icmp-echo {destination-ip-address | destination-hostname} [source-ip {ip-address | hostname} | source-interface interface-id]

Configure the IP SLAs operation as an ICMP Echo operation and enter ICMP echo configuration mode.

destination-ip-address | destination-hostname—Specify the destination IP address or hostname.

(Optional) source-ip {ip-address | hostname}Specify the source IP address or hostname. When a source IP address or hostname is not specified, IP SLAs chooses the IP address nearest to the destination

(Optional) source-interface interface-id—Specify the source interface for the operation.

Step 4 

frequency seconds

(Optional) Set the rate at which a specified IP SLAs operation repeats. The range is from 1 to 604800 seconds; the default is 60 seconds.

Step 5 

exit

Exit UDP jitter configuration mode, and return to global configuration mode.

Step 6 

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]

Configure the scheduling parameters for an individual IP SLAs operation.

operation-number—Enter the RTR entry number.

(Optional) life—Set the operation to run indefinitely (forever) or for a specific number of seconds. The range is from 0 to 2147483647. The default is 3600 seconds (1 hour)

(Optional) start-time—Enter the time for the operation to begin collecting information:

To start at a specific time, enter the hour, minute, second (in 24-hour notation), and day of the month. If no month is entered, the default is the current month.

Enter pending to select no information collection until a start time is selected.

Enter now to start the operation immediately.

Enter after hh:mm:ss to indicate that the operation should start after the entered time has elapsed.

(Optional) ageout seconds—Enter the number of seconds to keep the operation in memory when it is not actively collecting information. The range is 0 to 2073600 seconds; the default is 0 seconds (never ages out).

(Optional) recurring—Set the operation to automatically run every day.

Step 7 

end

Return to privileged EXEC mode.

Step 8 

show ip sla configuration [operation-number]

(Optional) Display configuration values including all defaults for all IP SLAs operations or a specified operation.

Step 9 

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable the IP SLAs operation, enter the no ip sla operation-number global configuration command. This example shows how to configure an ICMP echo IP SLAs operation:

Switch(config)# ip sla 12 
Switch(config-ip-sla)# icmp-echo 172.29.139.134 
Switch(config-ip-sla-echo)# frequency 30 
Switch(config-ip-sla-echo)# exit 
Switch(config)# ip sla schedule 5 start-time now life forever 
Switch(config)# end
Switch# show ip sla configuration 22
IP SLAs, Infrastructure Engine-II.
 
   
Entry number: 12
Owner:
Tag:
Type of operation to perform: echo
Target address: 2.2.2.2
Source address: 0.0.0.0
Request size (ARR data portion): 28
Operation timeout (milliseconds): 5000
Type Of Service parameters: 0x0
Verify data: No
Vrf Name:
Schedule:
    Operation frequency (seconds): 60
    Next Scheduled Start Time: Pending trigger
    Group Scheduled : FALSE
    Randomly Scheduled : FALSE
    Life (seconds): 3600
    Entry Ageout (seconds): never
    Recurring (Starting Everyday): FALSE
    Status of entry (SNMP RowStatus): notInService
Threshold (milliseconds): 5000
Distribution Statistics:
    Number of statistic hours kept: 2
    Number of statistic distribution buckets kept: 1
    Statistic distribution interval (milliseconds): 20
History Statistics:
    Number of history Lives kept: 0
    Number of history Buckets kept: 15
    History Filter Type: None
Enhanced History:

Monitoring IP SLAs Operations

Use the user EXEC or privileged EXEC commands in Table 44-1 to display IP SLAs operations configuration and results.

Table 44-1 Monitoring IP SLAs Operations

Command
Purpose

show ip sla application

Display global information about Cisco IOS IP SLAs.

show ip sla authentication

Display IP SLAs authentication information.

show ip sla configuration [entry-number]

Display configuration values including all defaults for all IP SLAs operations or a specific operation.

show ip sla enhanced-history {collection-statistics | distribution statistics} [entry-number]

Display enhanced history statistics for collected history buckets or distribution statistics for all IP SLAs operations or a specific operation.

show ip sla ethernet-monitor configuration [entry-number]

Display IP SLAs automatic Ethernet configuration.

show ip sla group schedule [schedule-entry-number]

Display IP SLAs group scheduling configuration and details.

show ip sla history [entry-number | full | tabular]

Display history collected for all IP SLAs operations

show ip sla mpls-lsp-monitor {collection-statistics | configuration | ldp operational-state | scan-queue | summary [entry-number] | neighbors}

Display MPLS label switched path (LSP) Health Monitor operations,

show ip sla reaction-configuration [entry-number]

Display the configured proactive threshold monitoring settings for all IP SLAs operations or a specific operation.

show ip sla reaction-trigger [entry-number]

Display the reaction trigger information for all IP SLAs operations or a specific operation.

show ip sla responder

Display information about the IP SLAs responder.

show ip sla statistics [entry-number | aggregated | details]

Display current or aggregated operational status and statistics.