IP SLAs Configuration Guide, Cisco IOS XE 17 (Cisco ASR 920 Series)
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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.
Prerequisites for ITU-T Y.1731 Operations
IEEE-compliant Connectivity Fault Management (CFM) must be configured and enabled for Y.1731 performance monitoring to function.
Y1731 is supported on Port Channel interfaces.
Restrictions for IP SLAs Y.1731 On-Demand Operations
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
IPSLA Y1731 SLM Feature Enhancements
On-demand IP SLAs Synthetic Loss Measurement (SLM) operations, in the IPSLA Y1731 SLM Feature Enhancements feature, enable
users without configuration access to perform real-time troubleshooting of Ethernet services. There are two operational modes
for on-demand operations: direct mode that creates and runs an operation immediately and referenced mode that starts and runs
a previously configured operation.
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 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
Configuring a Direct On-Demand Operation on a Sender MEP
Before you begin
Class of Service (CoS)-level monitoring must be enabled on MEPs associated to the Ethernet frame loss operation by using
monitorlosscounter 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.
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
Creates and runs an on-demand operation in direct mode.
To create and run concurrent on-demand operations, configure this command using the
Statistical output is posted on the console after the operation is finished.
Repeat this step for each on-demand operation to be run.
After an on-demand operation is finished and the statistics handled, the operation is deleted.
Configuring a Referenced On-Demand Operation on a Sender MEP
After an on-demand operation is finished and the statistics handled, the on-demand version of the operation is deleted.
Before you begin
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.
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Feature Information for IP
SLAs Y.1731 On-Demand and Concurrent 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 IP SLAs Y.1731 On-Demand and Concurrent Operations
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).