IP SLAs -- Analyzing IP Service Levels Using the DLSw+ Operation [Cisco IOS and NX-OS Software]

Table Of Contents

IP SLAs—Analyzing IP Service Levels Using the DLSw+ Operation

Contents

Prerequisites for the IP SLAs DLSw+ Operation

Information About the IP SLAs DLSw+ Operation

DLSw+ Operation

How to Configure the IP SLAs DLSw+ Operation

Configuring and Scheduling a DLSw+ Operation on the Source Device

Configuring and Scheduling a Basic DLSw+ Operation on the Source Device

Configuring and Scheduling a DLSw+ Operation with Optional Parameters on the Source Device

Configuration Examples for the IP SLAs DLSw+ Operation

Configuring a DLSw+ Operation: Example

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for the IP SLAs DLSw+ Operation

IP SLAs—Analyzing IP Service Levels Using the DLSw+ Operation

First Published: August 14, 2006

Last Updated: August 29, 2006

This module describes how to use the Cisco IOS IP Service Level Agreements (SLAs) DLSw+ operation to measure the Data Link Switching Plus (DLSw+) protocol stack and network response time between DLSw+ peers. IP SLAs is a portfolio of technology embedded in most devices that run Cisco IOS software, which allows Cisco customers to analyze IP service levels for IP applications and services, to increase productivity, to lower operational costs, and to reduce the frequency of network outages. IP SLAs uses active traffic monitoring—the generation of traffic in a continuous, reliable, and predictable manner—for measuring network performance. This module also demonstrates how the results of the DLSw+ operation can be displayed and analyzed to determine the DLSw+ peer tunnel response time.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for the IP SLAs DLSw+ Operation" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 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 the IP SLAs DLSw+ Operation

•Information About the IP SLAs DLSw+ Operation

•How to Configure the IP SLAs DLSw+ Operation

•Configuration Examples for the IP SLAs DLSw+ Operation

•Where to Go Next

•Additional References

•Feature Information for the IP SLAs DLSw+ Operation

Prerequisites for the IP SLAs DLSw+ Operation

Before configuring the IP SLAs DLSw+ operation you should be familiar with the "Cisco IOS IP SLAs Overview" chapter of the Cisco IOS IP SLAs Configuration Guide.

Information About the IP SLAs DLSw+ Operation

To perform the tasks required to analyze DLSw+ peer response times using IP SLA, you should understand the following concept:

•DLSw+ Operation

DLSw+ Operation

The Cisco IOS IP SLAs DLSw+ operation measures the DLSw+ protocol stack and network response time between DLSw+ peers. DLSw+ is the enhanced Cisco version of RFC 1795. DLSw+ tunnels non-routable Layer 2 traffic such as Systems Network Architecture (SNA) traffic over IP backbones via TCP. The networking devices performing the tunneling of non-routable traffic into TCP/IP are referred to as DLSw+ peers. DLSw+ peers normally communicate through TCP port 2065. The destination networking device does not have to be a Cisco router if it supports RFC 1795.

In Figure 1, Router A is configured as the source IP SLAs device and a DLSw+ operation is configured with Router B as the remote DLSw+ peer. Router A and Router B are configured as connected DLSw+ peers. The peer (destination device) does not have to run a Cisco IOS IP SLA-capable image.

Figure 1 DLSw+ Operation

Network response time is computed by measuring the round-trip time (RTT) taken to connect to the remote DLSw+ peer using TCP. This operation does not use the IP SLAs Responder.

How to Configure the IP SLAs DLSw+ Operation

This section contains the following procedure:

•Configuring and Scheduling a DLSw+ Operation on the Source Device (required)

Configuring and Scheduling a DLSw+ Operation on the Source Device

To measure the response time between a Cisco device and a DLSw+ peer, use the IP SLAs DLSw+ operation. This operation does not require the IP SLAs Responder to be enabled so there are no tasks to be performed on the destination device.

Perform one of the following tasks in this section, depending on whether you want to configure a basic DLSw+ operation or configure a DLSw+ operation with optional parameters:

•Configuring and Scheduling a Basic DLSw+ Operation on the Source Device

•Configuring and Scheduling a DLSw+ Operation with Optional Parameters on the Source Device

Configuring and Scheduling a Basic DLSw+ Operation on the Source Device

Perform this task to enable a DLSw+ operation without any optional parameters.

Note For information on scheduling a group of operations, see the "IP SLAs—Multioperation Scheduling of IP SLAs Operations" chapter of the Cisco IOS IP SLAs Configuration Guide.

Prerequisites

Before enabling the IP SLAs DLSw+ operation you must configure a connected DLSw+ peer between the source and destination networking devices.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip sla operation-number

4. dlsw peer-ipaddr ip-address

5. frequency seconds

6. exit

7. 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]

8. 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 operation-number
Example:

Router(config)# ip sla 10

Begins configuration for an IP SLAs operation and enters IP SLA configuration mode.

Step 4

dlsw peer-ipaddr ip-address
Example:

Router(config-ip-sla)# dlsw peer-ipaddr 172.21.27.11

Defines a DLSw+ operation and enters IP SLA DLSw+ configuration mode.

Step 5

frequency seconds
Example:

Router(config-ip-sla-dlsw)# frequency 30

(Optional) Sets the rate at which a specified IP SLAs operation repeats.

Step 6

exit
Example:

Router(config-ip-sla-dlsw)# exit

Exits IP SLA DLSw+ configuration mode and returns to global configuration mode.

Step 7

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]
Example:

Router(config)# ip sla schedule 10 start-time now life forever

Configures the scheduling parameters for an individual IP SLAs operation.

Step 8

exit
Example:

Router(config)# exit

(Optional) Exits global configuration mode and returns to privileged EXEC mode.

What to Do Next

To view and interpret the results of an IP SLAs operation use the show ip sla statistics command. Checking the output for fields that correspond to criteria in your service level agreement will help you determine whether the service metrics are acceptable.

Configuring and Scheduling a DLSw+ Operation with Optional Parameters on the Source Device

Perform this task to enable a DLSw+ operation on the source device and configure some optional IP SLAs parameters. The source device is the location at which the measurement statistics are stored.

Note For information on scheduling a group of operations, see the "IP SLAs—Multioperation Scheduling of IP SLAs Operations" chapter of the Cisco IOS IP SLAs Configuration Guide.

Prerequisites

Before enabling the IP SLAs DLSw+ operation you must configure a connected DLSw+ peer between the source and destination networking devices.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip sla operation-number

4. dlsw peer-ipaddr ip-address

5. history buckets-kept size

6. history distributions-of-statistics-kept size

7. history enhanced [interval seconds] [buckets number-of-buckets]

8. history filter {none | all | overThreshold | failures}

9. frequency seconds

10. history hours-of-statistics-kept hours

11. history lives-kept lives

12. owner owner-id

13. request-data-size bytes

14. history statistics-distribution-interval milliseconds

15. tag text

16. threshold milliseconds

17. timeout milliseconds

18. exit

19. 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]

20. exit

21. show ip sla configuration [operation-number]

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 operation-number
Example:

Router(config)# ip sla 10

Begins configuration for an IP SLAs operation and enters IP SLA configuration mode.

Step 4

dlsw peer-ipaddr ip-address
Example:

Router(config-ip-sla)# dlsw peer-ipaddr 172.21.27.11

Defines a DLSw+ operation and enters IP SLA DLSw configuration mode.

Step 5

history buckets-kept size
Example:

Router(config-ip-sla-dlsw)# history buckets-kept 25

(Optional) Sets the number of history buckets that are kept during the lifetime of an IP SLAs operation.

Step 6

history distributions-of-statistics-kept size
Example:

Router(config-ip-sla-dlsw)# history distributions-of-statistics-kept 5

(Optional) Sets the number of statistics distributions kept per hop during an IP SLAs operation.

Step 7

history enhanced [interval seconds] [buckets number-of-buckets]
Example:

Router(config-ip-sla-dlsw)# history enhanced interval 900 buckets 100

(Optional) Enables enhanced history gathering for an IP SLAs operation.

Step 8

history filter {none | all | overThreshold | failures}
Example:

Router(config-ip-sla-dlsw)# history filter failures

(Optional) Defines the type of information kept in the history table for an IP SLAs operation.

Step 9

frequency seconds
Example:

Router(config-ip-sla-dlsw)# frequency 30

(Optional) Sets the rate at which a specified IP SLAs operation repeats.

Step 10

history hours-of-statistics-kept hours
Example:

Router(config-ip-sla-dlsw)# hours-of-statistics-kept 4

(Optional) Sets the number of hours for which statistics are maintained for an IP SLAs operation.

Step 11

history lives-kept lives
Example:

Router(config-ip-sla-dlsw)# history lives-kept 5

(Optional) Sets the number of lives maintained in the history table for an IP SLAs operation.

Step 12

owner owner-id
Example:

Router(config-ip-sla-dlsw)# owner admin

(Optional) Configures the Simple Network Management Protocol (SNMP) owner of an IP SLAs operation.

Step 13

request-data-size bytes
Example:

Router(config-ip-sla-dlsw)# request-data-size 64

(Optional) Sets the protocol data size in the payload of an IP SLAs operation's request packet.

Step 14

history statistics-distribution-interval milliseconds
Example:

Router(config-ip-sla-dlsw)# history statistics-distribution-interval 10

(Optional) Sets the time interval for each statistics distribution kept for an IP SLAs operation.

Step 15

tag text
Example:

Router(config-ip-sla-dlsw)# tag TelnetPollServer1

(Optional) Creates a user-specified identifier for an IP SLAs operation.

Step 16

threshold milliseconds
Example:

Router(config-ip-sla-dlsw)# threshold 10000

(Optional) Sets the upper threshold value for calculating network monitoring statistics created by an IP SLAs operation.

Step 17

timeout milliseconds
Example:

Router(config-ip-sla-dlsw)# timeout 10000

(Optional) Sets the amount of time an IP SLAs operation waits for a response from its request packet.

Step 18

exit
Example:

Router(config-ip-sla-dlsw)# exit

Exits DLSw configuration submode and returns to global configuration mode.

Step 19

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]
Example:

Router(config)# ip sla schedule 10 start-time now life forever

Configures the scheduling parameters for an individual IP SLAs operation.

Step 20

exit
Example:

Router(config)# exit

(Optional) Exits global configuration mode and returns to privileged EXEC mode.

Step 21

show ip sla configuration [operation-number]
Example:

Router# show ip sla configuration 10

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

Examples

The following sample output shows the configuration of all the IP SLAs parameters (including defaults) for the DLSw+ operation number 14.
Router# show ip sla configuration 14
Complete Configuration Table (includes defaults)
Entry number: 14
Owner: 
Tag: DLSw-Test
Type of operation to perform: dlsw
Peer address: 172.21.27.11
Request size (ARR data portion): 0
Operation timeout (milliseconds): 50000
Operation frequency (seconds): 50
Next Scheduled Start Time: Start Time already passed
Group Scheduled: FALSE
Life (seconds): 50
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
Number of history Lives kept: 0
Number of history Buckets kept: 15
History Filter Type: None
Troubleshooting Tips

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 view and interpret the results of an IP SLAs operation use the show ip sla statistics command. Checking the output for fields that correspond to criteria in your service level agreement will help you determine whether the service metrics are acceptable.

Configuration Examples for the IP SLAs DLSw+ Operation

This section contains the following configuration example:

•Configuring a DLSw+ Operation: Example

Configuring a DLSw+ Operation: Example

The following example shows how to configure a DLSw+ operation as shown in Figure 1 from Router A to Router B, a remote DLSw+ peer. Router B is configured as a DLSw+ peer and Router A is specified as the remote (connected) DLSw+ peer. Router A is then configured as a DLSw+ peer with Router B as the connected DLSw+ peer, and the IP SLAs DLSw+ operation parameters are configured. The operation is scheduled to start immediately and run for 7200 seconds (2 hours).

Router B Configuration
configure terminal
dlsw local-peer peer-id 172.21.27.11
dlsw remote-peer 0 tcp 172.20.26.10
Router A Configuration
dlsw local-peer peer-id 172.20.26.10
dlsw remote-peer 0 tcp 172.21.27.11
ip sla 14
 dlsw peer-ipaddr 172.21.27.11
 frequency 50
 timeout 50000
 tag DLSw-Test
 exit
ip sla schedule 14 life 7200 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 the IP SLAs DLSw+ operation.

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, and support for existing standards has not been modified 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

RFC 1795

Data Link Switching: Switch-to-Switch Protocol

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

Feature Information for the IP SLAs DLSw+ Operation

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.

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.

Table 1 Feature Information for the IP SLAs DLSw+ Operation

Feature Name

Releases

Feature Information

IP SLAs DLSw+ Operation

12.3(14)T

The Cisco IOS IP SLAs Data Link Switching Plus (DLSw+) operation allows you to schedule and measure the DLSw+ protocol stack and network response time between DLSw+ peers

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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. (0807R)

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.

© 2006-2008 Cisco Systems, Inc. All rights reserved.

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IP SLAs -- Analyzing IP Service Levels Using the DLSw+ Operation

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Table Of Contents

IP SLAs—Analyzing IP Service Levels Using the DLSw+ Operation

Contents

Prerequisites for the IP SLAs DLSw+ Operation

Information About the IP SLAs DLSw+ Operation

DLSw+ Operation

How to Configure the IP SLAs DLSw+ Operation

Configuring and Scheduling a DLSw+ Operation on the Source Device

Configuring and Scheduling a Basic DLSw+ Operation on the Source Device

Prerequisites

SUMMARY STEPS

DETAILED STEPS

What to Do Next

Configuring and Scheduling a DLSw+ Operation with Optional Parameters on the Source Device

Prerequisites

SUMMARY STEPS

DETAILED STEPS

Examples

Troubleshooting Tips

What to Do Next

Configuration Examples for the IP SLAs DLSw+ Operation

Configuring a DLSw+ Operation: Example

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for the IP SLAs DLSw+ Operation

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. (0807R)