Viewing Performance Management Statistics
You can employ the ITU-T Y.1731 standard-compliant Ethernet loss measurement (ETH-LM), Ethernet synthetic loss measurement (ETH-SLM), and Ethernet delay measurement (ETH- DM) capabilities to analyze and examine the operating efficiency and performance status. These performance monitoring functionalities can be run for E-Line and E-LAN services. You can start and stop the collection of Y1731 performance monitoring (PM) statistics on the services that you want to monitor. The retrieval and computation of statistical details is performed using SNMP MIBs.
A predefined event script , PM.slax, is available, which needs to be downloaded on devices. Whenever you trigger the PM mechanism from the Connectivity Services Director GUI, an event is initiated, which in turn causes the SLAX script to be run. The event continues to run the script until the event is stopped. The event runs the script at intervals of 5 minutes. The monitoring framework is used to consolidate and display the retrieved counters and values.
The following topics show how to view the performance statistics for E-Line and E-LAN services:
Viewing Y.1731 Performance Monitoring Statistics for E-Line Services
The Y.1731 monitoring functionality is not enabled by default. You must explicitly start the PM collection mechanism by selecting OAM > Y1731 > Start from the task pane after selecting the specified service in the View pane. The graphical representation of the retrieved statistical details for the service is displayed, based on data availability. The data collected is retained after you stop the PM collection utility for future reference and correlation.
If you are upgrading from the older version of Services Activation Director to Connectivity Services Director 1.0, you must stop any performance monitoring and restart the collection of Y1731 PM statistics on the endpoints.
The refresh of values and statuses of the parameters displayed in the graphs and tables of different monitors depends on the polling interval configured under the Monitoring tab of the Preferences page (accessible by clicking the down arrow beside the System button in the Connectivity Services Director banner and selecting Preferences).
To view the statistics for the E-Line service:
Select Service View from the View Selector. The workspaces that are applicable to routing and tunnel services are displayed.
From the Junos Space user interface, click the Monitor icon on the Connectivity Services Director banner. The functionalities that you can configure in this mode are displayed in the task pane.
From the Service View pane, which is the left pane in the window, click the plus sign (+) next to Network Services to expand the tree and display the different service types that you can configure.
Click the plus sign (+) beside E-Line Services to view the E-Line service orders. Select the E-Line service order for which you want to monitor performance statistics.
Alternatively, click the plus sign (+) beside E-LAN Services to view the E-LAN service orders. Select the E-LAN service order for which you want to monitor performance statistics.
Select the OAM > Y1731 tab.
View and analyze the respective graph.
The following monitors are displayed:
Connections
This monitor shows the status of connections between peer devices. In the tabular view, the row represents the source device and the columns denote the neighboring and destination devices. This monitor is applicable for E-Line and E-LAN services. A green up-arrow in the indicates that the adjoining device in the network path to the destination device is operationally up. A red down-arrow indicates that the device is down. For the device for which the connection status is displayed, a value of NA is displayed under its own corresponding column to denote that it is not applicable. Click Refresh at the top of the monitor to update and display the contents of the table.
From the Time Interval drop-down box, select 1 Hour, 8 Hours, 1 Day, 1 Week, 1 Month, 3 Months, 6 Months, 1 Year, or Custom to specify the duration for which the data polled from devices needs to be displayed. If you select the Custom option, the Time range popup dialog box is displayed. Specify the date from the calendar, and select the Time From (Start time in the 24-hour time format of collection of data), and Time To (End time in the 24-hour time format of collection of data). Click OK to save the settings. Else, click Cancel to discard the configuration.
Loss Measurement
The Loss Measurement graph displays a real-time linear plot of delay value with respect to the time. The x-axis represents the time and the y-axis represents the frame loss ratio. Near-end frame loss refers to the count of frame loss associated with ingress data frames. Far-end frame loss refers to the count of frame loss associated with egress data frames. The lines represent the best case frame loss or the lowest frame loss, the worst case frame loss or the highest frame loss, and the average frame loss or the median of the highest and lowest frame losses. The frame loss is calculated by collecting the counter values applicable for ingress and egress service frames. The counters maintain a count of transmitted and received data frames between a pair of MEPs. The loss measurement statistics are retrieved as the output of the monitor ethernet loss-measurement command and are also stored at the initiator. The frame counts are stored at both the initiator and the receiver MEPs for later retrieval. The on-demand loss measurement statistics is collected for E-Line service only. There are two linear charts: Near-End-CIR and Far-End-CIR. For each interval, the graph plots three values: Average case, best case, and worst case frame loss. From the Loss End drop-down list, select Near-end (CIR) to display frame loss statistics associated with ingress data frames or Far-end (CIR) to display frame loss statistics associated with egress data frames. Mouse over the legends to view the lines corresponding to best-case, average, and worst-case frame loss statistics.
Delay Measurement
The Delay Measurement graph displays a real-time linear plot of delay value with respect to the time. The x-axis represents the time and the y-axis represents frame delay in microseconds. The legends reference average one-way delay, best-case one-way delay, and worst-case one way delay for one-way delay measurement. The green line denotes the lowest one-way frame delay for the statistics displayed, the orange line denotes the highest one-way frame delay for the statistics displayed, and the blue line denotes the average one-way frame delay for the statistics displayed. The legends reference average two-way delay, best-case two-way delay, and worst-case two-way delay for two-way delay measurement. The green line denotes the lowest two-way frame delay for the statistics displayed, the orange line denotes the highest two-way frame delay for the statistics displayed, and the blue line denotes the average two-way frame delay for the statistics displayed. From the Delay End drop-down box, select 1-Way or 2-Way to display the one-way or two-way frame delay measurement protocols respectively.
Delay Variation
The Delay Variation graph displays the difference between the consecutive frame delay values. The x-axis represents the time and the y-axis represents delay variation in microseconds. The line denotes the average one-way delay variation or the average one-way “frame jitter” for the statistics displayed for one-way frame delay measurement. The line denotes the average two-way delay variation or the average two-way “frame jitter” for the statistics displayed for two-way delay measurement.
The Loss Measurement monitor displays two real-time linear plots: Near End (CIR) and Far End (CIR). The three parameters in each graph plot are average case, best case, and worst case of frame-loss.
The graph is plotted in real-time. By default, the total time duration is ten minutes. If the duration of statistics collection exceeds ten minutes, the graph scrolls and shows the data of latest ten minutes.
See also
Viewing Y.1731 Performance Monitoring Statistics for E-LAN Services
If you are upgrading from the older version of Services Activation Director to Connectivity Services Director 1.0, you must stop any performance monitoring and restart the collection of Y1731 PM statistics on the endpoints.
The Y.1731 monitoring functionality is not enabled by default. You must explicitly start the PM collection mechanism by selecting OAM > Y1731 > Start from the task pane after selecting the specified service in the View pane. The graphical representation of the retrieved statistical details for the service is displayed, based on data availability. The data collected is retained after you stop the PM collection utility for future reference and correlation.
The refresh of values and statuses of the parameters displayed in the graphs and tables of different monitors depends on the polling interval configured under the Monitoring tab of the Preferences page (accessible by clicking the down arrow beside the System button in the Connectivity Services Director banner and selecting Preferences).
To view the statistics for the E-LAN service:
Select Service View from the View Selector. The workspaces that are applicable to routing and tunnel services are displayed.
From the Junos Space user interface, click the Monitor icon on the Connectivity Services Director banner. The functionalities that you can configure in this mode are displayed in the task pane.
From the Service View pane, which is the left pane in the window, click the plus sign (+) next to Network Services to expand the tree and display the different service types that you can configure.
Click the plus sign (+) beside E-Line Services to view the E-Line service orders. Select the E-Line service order for which you want to monitor performance statistics.
Alternatively, click the plus sign (+) beside E-LAN Services to view the E-LAN service orders. Select the E-LAN service order for which you want to monitor performance statistics.
Select the OAM > Y1731 tab.
View and analyze the graphs.
The following monitors are displayed:
Connections
This monitor shows the status of connections between peer devices. In the tabular view, the row represents the source device and the columns denote the neighboring and destination devices. This monitor is applicable for E-Line and E-LAN services. A green up-arrow in the indicates that the adjoining device in the network path to the destination device is operationally up. A red down-arrow indicates that the device is down. For the device for which the connection status is displayed, a value of NA is displayed under its own corresponding column to denote that it is not applicable. Click Refresh at the top of the monitor to update and display the contents of the table.
From the Time Interval drop-down box, select 1 Hour, 8 Hours, 1 Day, 1 Week, 1 Month, 3 Months, 6 Months, 1 Year, or Custom to specify the duration for which the data polled from devices needs to be displayed. If you select the Custom option, the Time range popup dialog box is displayed. Specify the date from the calendar, and select the Time From (Start time in the 24-hour time format of collection of data), and Time To (End time in the 24-hour time format of collection of data). Click OK to save the settings. Else, click Cancel to discard the configuration.
Loss Measurement
The Loss Measurement graph displays a real-time linear plot of delay value with respect to the time. The x-axis represents the time and the y-axis represents the frame loss ratio. Near-end frame loss refers to the count of frame loss associated with ingress data frames. Far-end frame loss refers to the count of frame loss associated with egress data frames. The lines represent the best case frame loss or the lowest frame loss, the worst case frame loss or the highest frame loss, and the average frame loss or the median of the highest and lowest frame losses. The frame loss is calculated by collecting the counter values applicable for ingress and egress service frames. The counters maintain a count of transmitted and received data frames between a pair of MEPs. The loss measurement statistics are retrieved as the output of the monitor ethernet loss-measurement command and are also stored at the initiator. The frame counts are stored at both the initiator and the receiver MEPs for later retrieval. The on-demand loss measurement statistics is collected for E-Line service only. There are two linear charts: Near-End-CIR and Far-End-CIR. For each interval, the graph plots three values: Average case, best case, and worst case frame loss. From the Loss End drop-down list, select Near-end (CIR) to display frame loss statistics associated with ingress data frames or Far-end (CIR) to display frame loss statistics associated with egress data frames. Mouse over the legends to view the lines corresponding to best-case, average, and worst-case frame loss statistics.
Delay Measurement
The Delay Measurement graph displays a real-time linear plot of delay value with respect to the time. The x-axis represents the time and the y-axis represents frame delay in microseconds. The legends reference average one-way delay, best-case one-way delay, and worst-case one way delay for one-way delay measurement. The green line denotes the lowest one-way frame delay for the statistics displayed, the orange line denotes the highest one-way frame delay for the statistics displayed, and the blue line denotes the average one-way frame delay for the statistics displayed. The legends reference average two-way delay, best-case two-way delay, and worst-case two-way delay for two-way delay measurement. The green line denotes the lowest two-way frame delay for the statistics displayed, the orange line denotes the highest two-way frame delay for the statistics displayed, and the blue line denotes the average two-way frame delay for the statistics displayed. From the Delay End drop-down box, select 1-Way or 2-Way to display the one-way or two-way frame delay measurement protocols respectively.
Delay Variation
The Delay Variation graph displays the difference between the consecutive frame delay values. The x-axis represents the time and the y-axis represents delay variation in microseconds. The line denotes the average one-way delay variation or the average one-way “frame jitter” for the statistics displayed for one-way frame delay measurement. The line denotes the average two-way delay variation or the average two-way “frame jitter” for the statistics displayed for two-way delay measurement.
The Loss Measurement monitor displays two real-time linear plots: Near End (CIR) and Far End (CIR). The three parameters in each graph plot are average case, best case, and worst case of frame-loss.
The graph is plotted in real-time. By default, the total time duration is ten minutes. If the duration of statistics collection exceeds ten minutes, the graph scrolls and shows the data of latest ten minutes.