Configuring IP SLAs DLSw+ Operations

This module describes how to configure the IP Service Level Agreements (SLAs) Data Link Switching Plus (DLSw+) operation to measure and analyze the DLSw+ protocol stack and network response time between DLSw+ peers.

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.

Prerequisites

A connected DLSw+ peer between the source and destination networking devices must be configured.

Information About IP SLAs DLSw+ Operations

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 the figure below, 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 IP SLAs DLSw+ Operations

Configuring IP SLAs DLSw+ Operations


Note

There is no need to configure an IP SLAs responder on the destination device.

Perform one of the following tasks:

Configuring a Basic DLSw+ Operation on the Source Device

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. ip sla operation-number
  4. dlsw peer-ipaddr ip-address
  5. frequency seconds
  6. end

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

end

Example:

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

Exits to privileged EXEC mode.

Configuring an IP SLAs DLSw+ Operation with Optional Parameters on the Source Device

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. end

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

end

Example:

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

Exits to privileged EXEC mode.

Scheduling IP SLAs Operations

Before you begin

  • All IP Service Level Agreements (SLAs) operations to be scheduled must be already configured.
  • The frequency of all operations scheduled in a multioperation group must be the same.
  • The list of one or more operation ID numbers to be added to a multioperation group must be limited to a maximum of 125 characters in length, including commas (,).

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. Enter one of the following commands:
    • 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] }]
  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.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

Enter one of the following commands:

  • 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] }]

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

  • Configures the scheduling parameters for an individual IP SLAs operation.

  • Specifies an IP SLAs operation group number and the range of operation numbers for a multioperation scheduler.

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 SLAs operation is not running and not generating statistics, add the verify-data command to the configuration of the operation (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 SLAs operation, see the “Configuring Proactive Threshold Monitoring” section.

operation)

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

Configuration Examples for IP SLAs DLSw+ Operations

Example IP SLAs DLSw+ Operation Configuration

The following example shows the configuration for a DLSw+ operation 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

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Cisco IOS IP SLAs commands

Cisco IOS IP SLAs Command Reference

Cisco IOS IP SLAs: general information

Configuring IOS IP SLAs Overview chapter of the Cisco IOS IP SLAs Configuration Guide.

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

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for Cisco IOS IP SLAs DLSw+ Operations

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.
Table 1. Feature Information for Cisco IOS IP SLAs DLSw+ Operations

Feature Name

Releases

Feature Information

IP SLAs DLSw+ Operation

12.3(14)T 15.0(1)S

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