Prerequisites for ITU-T Y.1731 Operations
![]() Note |
Y1731 is supported on Port Channel interfaces. |
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This module describes how to configure the IPSLA Y1731 SLM Feature Enhancements feature for enabling real-time Ethernet service troubleshooting for users without configuration privileges. This feature supports on-demand Synthetic Loss Measurement (SLM) operations that can be run by issuing a single command in privileged EXEC mode.
![]() Note |
Y1731 is supported on Port Channel interfaces. |
SNMP is not supported for reporting threshold events or collecting performance statistics for on-demand operations.
On-demand operation statistics are not stored and are not supported by the statistic history and aggregation functions.
Information About IP SLAs Y.1731 On-Demand and Concurrent Operations
In the direct mode, a single command can be used to create multiple pseudo operations for a range of class of service (CoS) values to be run, in the background, immediately. A single command in privileged EXEC mode can be used to specify frame size, interval, frequency, and duration for the direct on-demand operation. Direct on-demand operations start and run immediately after the command is issued.
In the referenced mode, you can start one or more already-configured operations for different destinations, or for the same destination, with different CoS values. Issuing the privileged EXEC command creates a pseudo version of a proactive operation that starts and runs in the background, even while the proactive operation is running.
Once an on-demand operation is completed, statistical output is displayed on the console. On-demand operation statistics are not stored and are not supported by the statistic history and aggregation functions.
After an on-demand operation is completed, and the statistics handled, the direct and referenced on-demand operation is deleted. The proactive operations are not deleted and continue to be available to be run in referenced mode, again.
A concurrent operation consists of a group of operations, all configured with the same operation ID number, that run concurrently. Concurrent operations are supported for a given Ethernet Virtual Circuit (EVC), CoS, and remote Maintenance End Point (MEP) combination, or for multiple MEPs for a given multipoint EVC, for delay or loss measurements. A new keyword was added to the appropriate commands to specify that concurrent Ethernet frame Delay Measurement (ETH-DM) synthetic frames are sent during the operation.
The IPSLA Y.1731 SLM Feature Enhancements feature also supports burst mode for concurrent operations, one-way dual-ended, and single-ended delay and delay variation operations, as well as for single-ended loss operations. A new keyword was added to the appropriate commands to support bursts of PDU transmission during an aggregation interval. The maximum number of services monitored is 50 every 30 minutes, with an average of 25 services every 2 hours.
How to Configure IP SLAs Y.1731 On-Demand and Concurrent Operations
Class of Service (CoS)-level monitoring must be enabled on MEPs associated to the Ethernet frame loss operation by using the monitor loss counter command on the devices at both ends of the operation. See the Cisco IOS Carrier Ethernet Command Reference for command information. See the “Configuration Examples for IP SLAs Metro-Ethernet 3.0 (ITU-T Y.1731) Operations” section for configuration information.
![]() Note |
The Cisco IOS Y.1731 implementation allows monitoring of frame loss on an EVC regardless of the CoS value (any CoS or aggregate CoS cases). See the “Configuration Examples for IP SLAs Metro-Ethernet 3.0 (ITU-T Y.1731) Operations” section for configuration information. |
Command or Action | Purpose | |
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Step 1 |
enable Example:
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Step 2 |
ip sla on-demand ethernet {DMMv1 | SLM} domain domain-name {evc evc-id | vlan vlan-id} {mpid target-mp-id | mac-address target-address} cos cos {source {mpid source-mp-id | mac-address source-address}} {continuous [interval milliseconds] | burst [interval milliseconds] [number number-of-frames] [frequency seconds]} [size bytes] aggregation seconds {duration seconds | max number-of-packets} Example:
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![]() Note |
After an on-demand operation is finished and the statistics handled, the on-demand version of the operation is deleted. |
Single-ended and concurrent Ethernet delay, or delay variation, and frame loss operations to be referenced must be configured. See the “Configuring IP SLAs Metro-Ethernet 3.0 (ITU-T Y.1731) Operations” module of the IP SLAs Configuration Guide.
Command or Action | Purpose | |
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Step 1 |
enable Example:
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Step 2 |
ip sla on-demand ethernet [dmmv1 | slm] operation-number {duration seconds | max number-of-packets Example:
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IP SLAs Configuration Guide.
Configuration Examples for IP SLAs Y.1731 On-Demand and Concurrent Operations
Device# ip sla on-demand ethernet SLM domain xxx vlan 10 mpid 3 cos 1 source mpid 1 continuous aggregation 35 duration 38
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Distribution Statistics:
Interval 1
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Flag: OK
Forward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps forward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Backward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps backward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Distribution Statistics:
Interval 1
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Flag: OK
Forward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps forward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Backward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps backward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Device(config)# ip sla 11
Device(config-ip-sla)# ethernet y1731 loss SLM domain xxx vlan 10 mpid 3 cos 1 source mpid 1
Device(config-sla-y1731-loss)# end
Device# ip sla on-demand ethernet slm 11 duration 38
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Distribution Statistics:
Interval 1
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Flag: OK
Forward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps forward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Backward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps backward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Distribution Statistics:
Interval 1
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Flag: OK
Forward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps forward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Backward
Number of Observations 3
Available indicators: 0
Unavailable indicators: 3
Tx frame count: 30
Rx frame count: 30
Min/Avg/Max - (FLR % ): 0:9/000.00%/0:9
Cumulative - (FLR % ): 000.00%
Timestamps backward:
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Related Topic |
Document Title |
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Cisco IOS commands |
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Cisco IOS Carrier Ethernet commands |
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Cisco IOS IP SLAs commands |
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Ethernet CFM for ITU-T Y.1731 |
“ITU-T Y.1731 Performance Monitoring in a Service Provider Network” module of the Carrier Ethernet Configuration Guide |
Ethernet operations |
“Configuring IP SLAs Metro-Ethernet 3.0 (ITU-T Y.1731) Operations” module of the IP SLAs Configuration Guide |
Network Time Protocol (NTP) |
“Configuring NTP” module of the Network Management Configuration Guide |
Standard/RFC |
Title |
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ITU-T Y.1731 |
OAM functions and mechanisms for Ethernet-based networks |
MIB |
MIBs Link |
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To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Description |
Link |
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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. |
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 |
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IP SLAs Y.1731 On-Demand and Concurrent Operations |
Cisco IOS XE Release 3.13.0S |
This feature was introduced on the Cisco ASR 920 Series Aggregation Services Router (ASR-920-12CZ-A, ASR-920-12CZ-D, ASR-920-4SZ-A, ASR-920-4SZ-D). |