Top Destinations Test

In environments where the ADC appliance is deployed, external clients (Source IPs) communicate via the ADC appliance to access applications hosted on the servers (Destination IPs). The ADC appliance is deployed in front of the web or database servers and routes requests to the servers from the external clients through it. When multiple servers are responding to the requests received from the clients through the ADC device, it is impossible for the administrators to keep track of which server is sending the maximum amount of data to the clients while responding to the requests. In order to identify the topmost servers that are contributing to the maximum data transfer between the server and the client, adminsitrators can use the Top Destinations test. This test dynamically lists the top servers and for each server reports the amount of data sent from the serverto the client and amount of data received by the server from the client. By comparing the measures reported by this test, administrators can identify the topmost server (Destination IP) in terms of data transfer. 

For this test to run and report metrics, the ADC appliance should be configured to create a Syslog file in a remote Syslog server, where the details of all interactions with the ADC appliance will be logged. To know how to configure a remote Syslog server for the use of the ADC appliance, refer to Creating a Syslog file in a remote Syslog server topic.

This test is disabled by default. To enable the test, follow the Agents -> Tests -> Enable/Disable menu sequence in the eG administrative interface, pick Citrix ADC VPX/MPX as the Component type, select Performance as the Test type, choose this test from the list of disabled tests list, and click on the < button.

Target of the test : An ADC VPX/MPX

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each Destination IP address configured on the target Citrix ADC.

Configurable parameters for the test

Parameter	Description
Test Period	How often should the test be executed
Host	The IP address of the host for which the test is being configured.
Port	The port at which the host listens. By default, this is NULL.
Log File Path	This test reports metrics by parsing a Syslog file. Specify the full path to the Syslog file here.
Search String	By default, the Syslog file may contain information relating to a number of servers that are inter linked with the target ADC appliance. In order to obtain the metrics of the target ADC appliance alone, specify the hostname or the IP address of the target ADC appliance for which the logs are to be read from the syslog file, in the Search String text box. Using this search string the information in the Syslog file may be parsed and metrics may be collected.
Search String Index	Here, specify the cursor position after which the eG agent should search for the specified Search String (or the position up to which the eG agent should ignore while searching for the specified Search String) in the syslog file. For example, if the specified Search String appears in the syslog file at the 17th position, then you may need to specify the Search String as 16.
DD Frequency	Refers to the frequency with which detailed diagnosis measures are to be generated for this test. The default is 1:1. This indicates that, by default, detailed measures will be generated every time this test runs, and also every time the test detects a problem. You can modify this frequency, if you so desire. Also, if you intend to disable the detailed diagnosis capability for this test, you can do so by specifying none against DD Frequency.
Detailed Diagnosis	To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option. The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled: The eG manager license should allow the detailed diagnosis capability Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.

Measurements made by the test

Measurement	Description	Measurement Unit	Interpretation
Total data sent	Indicates the total amount of data sent from this destination IP to the source IP.	KB	Compare the value of this measure across the destination IP addresses to know which destination IP address is sending the maximum amount of data. The detailed diagnosis of this measure if enabled, lists the Destination IP, Source IP, start time, End time, total byte sent and the total byte received.
Total data received	Indicates the total amount of data received by this destination IP from the source IP.	KB	Compare the value of this measure across the destination IP addresses to know which destination IP address is receiving the maximum amount of data. The detailed diagnosis of this measure if enabled, lists the Destination IP, Source IP, start time, End time, total byte sent and the total byte received.