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Snapshot Reports Available

To view a report, click on it in the Quick Links window (you may have to view “More Reports...” to get to it) or select it from the Reports menu bar at the top of the control panel. The tabs at the bottom of the information window provide still another way to access reports - use whatever method is easiest for you.

When the report opens in the information window, you can use the controls described in the previous chapter to select a date/timestamp and other report-specific criteria.

previous and next arrowhead buttons at the bottom of the window to move forward and backward through the list of similar reports, according to timestamp.

The following reports are available through the Reports entry in the Quick Links window (you can also get to it from Reports in the menu bar): 

	Executive Summary
 
	Billing
 
	Application Delay
 
	Application Performance
 
	Application Traffic
 
	Network Availability
 
	Application Availability
 
	Link Availability
 
	Distribution
 
	Web Speedup
 
	Measurements
 
	Traffic Per Network
 
	Traffic Per Specified Network
 
	Traffic Per Network
 
	Observed
 
	Optimized
 
	Diagnostics
 
	Diagnostics (Brief)
Executive Summary Report

The Executive Summary item on the Snapshot Selection list opens a report titled Executive Summary. You can view a weighted version be selecting the Weighted Values checkbox in the Snapshot Selection dialog.

This report provides a high-level overview of the improvements made to your network by the CNA system:

The report is divided into two parts, plus a key which defines terms.

Billing Report

When you select Billing from the list of snapshot reports displayed in the Quick Links window, a report titled Billing will open in the information window at the bottom of the control panel.

This report provides an estimate of the bill you will receive from each of your service providers, for the time span in the Period Covered column.

See Figure 6.

Figure 6:  Billing snapshot report

Billing reports are generated internally at midnight preceding the first day of the month, with an entry for each link for which there is billing data in the CNA system’s running configuration. Billing reports cover the period of time beginning with the most recently passed billing cycle start date through the next billing cycle start date.

Until the report period ends, the Period Covered cell will read incomplete for each link.

If you add a link to the CNA configuration prior to the service provider’s billing cycle start date, the link will be added to the current report immediately. If you add a link to the configuration after its billing cycle start date, it will not appear until the next report, the one generated on the first day of the following month.

If no billing reports are available, the month and year menus will say None Available. You cannot open an empty report.

The billing estimate is based on usage data obtained by polling your edge routers, and on contract terms which you specified in the CNA configuration. For information about usage polling, see Chapter 4: Polling Routers in the CNA Advanced Monitoring Guide.

The Billing report consists of a table with a row for each configured link.

Columns in the report are:

NOTE: You can get more detailed billing information by clicking on the Billing item (use either the Show tab in the information window or Show Commands in the Quick Links menu) This is the same as the show link billing command in the CLI. For an explanation of the output, see Show Command Output in Chapter 4: Polling Routers of the CNA Advanced Monitoring Guide.

Application Delay Report

When you select Application Delay from the list of snapshot reports displayed in the Quick Links window, a report titled Application Delay (All) will open in the information window at the bottom of the control panel. This report shows how your network is performing, based on the measurement statistics gathered by CNA.

See Figure 7.

Figure 7:  Application Delay report

The Application Delay report consists of a table with a row for each prefix.

Columns in the report are as follows:

Application Performance Report

When you select Application Performance from the list of snapshot reports displayed in the Quick Links window, a report titled Application Performance (All) will open in the information window at the bottom of the control panel. This report shows how your network is performing, based on the measurement statistics gathered by CNA.

In addition to date and time, you can use the options dialog to select Blackout for the “Prefix Set” dropdown menu. This will limit the output to those prefixes that are in a blackout condition, as defined in the Executive Summary Report.

See Figure 8.

Figure 8:  Application Performance report

The Application Performance report consists of a table with a row for each prefix.

Columns in the report are as follows:

Link Availability report

When you select Link Availability from the Reports list, it will be displayed in the information window of the control panel. You can use the options dialog to select the date and time for this snapshot report.

This report shows you the outages that have occurred on your network, summarized for each link.

Figure 9:  Link Availability report

Each row of the table represents a different link.

Column headings are:

Distribution report

The Distribution item on the Snapshot Selection menu opens a report containing pie charts which show how prefixes are distributed among your edge routers.

You can also specify criteria for the report in the Options dialog. In addition to date and time, you can set the following:

Weighting consists of summing the average measurement rates for all prefixes per link and dividing the pie charts according to the relative sizes of those totals. This may give you a better idea of how traffic is being spread among your service providers, since charts based purely on prefix counts make no distinction between a prefix that carries a lot of traffic and a prefix that is seldom used.

The weighted distribution charts are most useful when the rate of UTT measurements is large, because the charts increase the significance of prefixes which generate more traffic. At low test-measurement rates, the weighting can be distorted since non-customer traffic (DNS health checks and active measurement probes) are included in the weight calculation.

The Prefix Distribution table shows numbers of prefixes or, if you select the Weighted Values checkbox in the Options dialog, percentage of traffic moved.

See Figure 10.

Figure 10:  Prefix Distribution report

Each of these reports consists of two pie charts and a table.

The pies represent prefix distribution according to BGP route selections, and distribution according to the routes chosen by the CNA system.

The pie representing the CNA choice is based on either the number of routes that have been asserted or how prefixes would be distributed if all of the CNA decision-maker choices were asserted and confirmed by the routers, depending on whether route assert mode has been enabled.

Each slice of the pie represents the percentage of prefixes assigned to a link, or for the weighted report, percentage of traffic moved by the link.

The Prefix Distribution chart shown shows the CNA system distributing prefixes significantly different from what would occur naturally using BGP-selected routes. The ISP represented by the largest segment in the BGP pie (green, 54 percent) has its share of prefixes reduced to 14 percent in the CNA distribution, while the ISP represented by the smallest segment in the BGP pie (blue, 20 percent) had its shares increased to 50 percent of the prefixes in the CNA distribution.

Each whole pie represents all prefixes known to the selected router for which the database contains the minimum number of measurements (as defined by the min-required-measurements command), or the traffic carried by these prefixes, if weighted.

The tables contain one row for each service provider link.

Tables in the Prefix Distribution reports (Figure 11) show numbers of prefixes.

Tables in the Weighted Distribution reports (Figure 12) show percentage of traffic.

Figure 11:  Prefix Distribution Table

Figure 12:  Weighted Distribution Table

Columns (from left to right in the illustrations) show the following:

The columns which depict numbers of prefixes show two values--a positive number shows how many prefixes were moved onto the link; a negative number shows how many prefixes were moved off the link because of an CNA decision.

NOTE: Reports that contain graphics--including distribution pie charts and trend report graphs--can be sent by e-mail; see the description of the E-mail command in the Menu bar section of Chapter 4: The CNA Web interface. Graphics will be sent in PNG format. If you receive an CNA e-mail with graphics, you can forward it to other recipients, but your mail program must be set to send the message as HTML. If you normally set messages to be sent in text-only format, the images will not be sent.

Traffic Per Network report

When you select Load Per Network from the list of snapshot reports displayed in the Quick Links window, a report titled Load Per Network will open in the information window at the bottom of the control panel. This report shows how your network is performing, based on the measurement statistics gathered by the CNA system.

See Figure 13.

Figure 13:  Load per Network report

The Load Per Network report consists of a table with a row for each prefix.

Columns in the report are as follows:

Measurements report

This report consists of a table which itemizes the number of measurements made for each prefix on each configured CNA link on all routers.

In addition to date and time, you can use the options dialog to select Blackout for the “Prefix Set” dropdown menu. This will limit the output to those prefixes that are in a blackout condition, as defined in the Web Speedup snapshot report.

See Figure 14.

Figure 14:  Measurements snapshot report

The table columns contain the following data:

Observed report

The report Observed (All) report contains data that the CNA system has observed, as opposed to data that has been optimized by the CNA decision-maker process (see the Optimized report description.) The observed data report identifies performance rankings--which links have been determined by the decision-maker process to be the best and worst performers--along with raw quantitative performance data (HRTT, measurement count and rate, and AS number of the prefix).

In contrast, the optimized report also identifies performance rankings, but includes qualitative values as well: speed-up factors (how many times faster an CNA choice performs compared to its BGP-selected counterpart), winner-set contents, and traffic-test rates.

In addition to date and time, you can use the options dialog to select Blackout for the “Prefix Set” dropdown menu. This will limit the output to those prefixes that are in a blackout condition, as defined in the Web Speedup snapshot report.

See Figure 15.

Figure 15:  Observed Performance snapshot report

The report consists of a table which compares Handshake Round Trip Time (HRTT) scores of the following categories of links, for each prefix on the CNA system’s most-active list:

See the section Prefixes (networks) Included in Reports elsewhere in this chapter for a definition of the most-active list.

Each row of the table represents a different prefix.

The table columns contain the following data:

NOTE: The key at the bottom of snapshot reports tells you what filter, if any, was used in generating the list. This filter is not user configurable. The number of prefixes in the list is determined by the current limit established by the report prefix-limit command in the device’s configuration.

Optimized report

When you select Optimized from the Reports list, a report titled Optimized All will be displayed in the information window of the control panel.

In addition to date and time, you can use the options dialog to select Blackout for the “Prefix Set” dropdown menu. This will limit the output to those prefixes that are in a blackout condition, as defined in the Web Speedup snapshot report.

When the report opens, a Router selection list will be added to the margin above the report. If your network includes multiple edge routers, you can switch among them by selecting a different router to open a new report. All other selection criteria will remain the same (unless you click on Select Snapshot, which will open the Snapshot Selection dialog to allow you to revise any of the criteria.)

The optimized performance report provides a qualitative summary of how the CNA decision-maker process has evaluated link performance per prefix, as opposed to the quantitative summary presented in the Observed report.

Figure 16:  Optimized Performance snapshot report

This report consists of a table that compares the pending winner, current winner, and BGP-selected link, for each prefix on the most-active list, on the specified router.

Each row of the table represents a different prefix.

Column headings are:

Diagnostics Report

The Diagnostics report represents a consolidation of output of several individual show commands giving you a summary snapshot of the state of the CNA system in a single report.

The report includes the output from the following show commands (listed in the order in which they appear in the report):

See Figure 17.

Figure 17:  Diagnostics report

Diagnostics (Brief)

This is a shortened form of the Diagnostics report above.

Rescued Networks (available from the Graphs Panel and the Show menu)

When you select Rescued Networks from the Reports list, it will be displayed in the information window of the control panel. You can use the options dialog to select the date and time for this snapshot report.

The Rescued Networks report shows you the outages for each prefix on your network.

Figure 18:  Rescued Networks report

Each row of the table represents a different prefix.

Column headings are:

Web Speedup Report

The Web Speedup item on the Snapshot Selection list opens a report titled Web Speedup. You can view a weighted version by selecting the Weighted Values checkbox in the Snapshot Selection dialog.

This report provides a high-level overview of the improvements made to Web applications on your network by the CNA system:

The report is divided into two parts, plus a key which defines terms.

The first part of the report, titled Improvement--All, summarizes improvements over all prefixes that have met the CNA system’s sufficiently measured requirements (see the min-required-measurements command).

The second part of the report, titled Improvement--Poorly Served End Users, provides the same information for three subsets of prefixes.

The Poor Performance and Very Poor Performance columns calculate the numbers and percentages for those prefixes that meet the conditions defined by at least one of the web-speedup min-bgp-hrtt and web-speedup worst-bgp-hrtt-percent commands, while the Prefix Blackouts column calculates similar numbers and percentages for those prefixes that were unreachable through their natural BGP routes.

The Poor column is cumulative. That is, the total number of prefixes categorized as poor performers includes the number categorized as very poor performers.

The Very Poor column is not cumulative. The number of prefixes categorized as very poor performers does not include prefixes in the Prefix Blackouts column.


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