Understanding Y.1564 - Ethernet Service Activation Test
Feature Name |
Release Information |
Feature Description |
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Y.1564 - Ethernet Service Activation Test (SAT) |
Cisco IOS XR Release 6.5.31 |
Y.1564 – Ethernet SAT is a standards-based test methodology to test turn up, installation, and troubleshooting of Ethernet-based services. This test methodology allows you to measure Frame Transfer Delay (FTD) or latency and Frame Loss Ratio (FLR) parameters. Commands added:
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Feature Name |
Release Information |
Feature Description |
---|---|---|
Y.1564 Ethernet SAT Support on Multi-chassis |
Cisco IOS XR Release 6.5.32 |
Y.1564 – Ethernet SAT feature supports up to four parallel SAT sessions in single chassis and up to four parallel SAT sessions for each rack in multi-chassis. |
Ethernet services have evolved significantly with the deployment of Ethernet in service provider networks. Ethernet is not only found at the User Network Interface (UNI) but can also be deployed anywhere in the network, creating a Network-to-Network Interface (NNI). With the capability to prioritize traffic, high availability, and its built-in resiliency, service providers are now using Ethernet technology to deliver advanced services. In the absence of any standardized test methodologies that can measure delay and loss, the ITU-T Y.1564 recommendation addresses this gap.
Y.1564 - Ethernet Service Activation Test (SAT) is a testing procedure which tests service turn-up, installation, and troubleshooting of Ethernet-based services. This test methodology was created to have a standard way of measuring Ethernet-based services in the industry.
Cisco's implementation of ITU-T Y.1564 has three key objectives:
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Serve as a network service level agreement (SLA) validation tool, ensuring that a service meets its guaranteed performance settings in a controlled test time.
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Ensure that all the services carried by the network meet their SLA objectives at their maximum committed rate.
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Perform medium-term and long-term service testing, confirming that network element can properly carry all the services while under stress during a soaking period.
The following Key Performance Indicators (KPI) metrics are collected to ensure that the configured SLAs are met for the service or stream.
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Frame Transfer Delay (FTD) or latency—Measures the round-trip time (RTT) taken by a test frame to travel through a network device, or across the network and back to the test port.
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Frame Loss Ratio (FLR)—Measures the number of packets lost from the total number of packets sent. Frame loss can be due to a number of issues such as network congestion or errors during transmissions.
Note |
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Note |
The maximum number of parallel SAT sessions supported is four in single chassis and four for each rack in multi-chassis. |
Note |
If the bundle interface has members on rack 1 and rack 2, the number of parallel SAT sessions supported is two in rack 1 and two in rack 2. |
Supported Modes
The mode of operation that is supported for Y.1564 is the two-way statistics collection mode. In the two-way mode, the sender generates the test traffic used to perform the test, which is then looped back by the remote node. The statistics are measured and collected locally on the sender.
The following encapsulations are supported by Y.1564 SAT feature:
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dot1q
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dot1q + second dot1q
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dot1ad
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dot1ad + second dot1q
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priority tagged
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untagged