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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 11 ITU-T Y.1731 Performance Monitoring
How to Configure ITU-T Y.1731 Performance Monitoring
• 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.
• After 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 EVC, CoS, and remote
MEP combination, or for multiple MEPs for a given multipoint EVC, for delay or loss measurements.
The Cisco ASR 901 router also supports burst mode for concurrent operations, one-way dual-ended,
single-ended delay and delay variation operations, and single-ended loss operations.
Supported interfaces
The ASR 901 router supports ITU-T Y.1731 performance monitoring on the following interfaces:
• DMM and SLM support on the EVC bridge domain (BD)
• DMM and SLM support on the Port-Channel EVC BD
• SLM support on the EVC cross connect
• SLM support on the Port-Channel EVC cross connect
• DMM and SLM support on the EVC BD for both the up and down MEPs
• SLM support on the EVC cross connect for both the up and down MEPs
Note SLM and DMM can be configured for the same EVCs over CFM session. The combined number of CFM,
DMM, and SLM sessions must be within the scale limits, otherwise DMM/SLM probes might get
dropped resulting in a few incomplete measurements.
Benefits of ITU-T Y.1731 Performance Monitoring
Combined with IEEE-compliant CFM, Y.1731 performance monitoring provides a comprehensive fault
management and performance monitoring solution for service providers. This comprehensive solution
in turn lessens service providers' operating expenses, improves their SLAs, and simplifies their
operations.
How to Configure ITU-T Y.1731 Performance Monitoring
• Configuring Two-Way Delay Measurement, page 11-6
• Configuring Single-Ended Synthetic Loss Measurement, page 11-9
• Scheduling IP SLAs Operations, page 11-14