F5 Virtual Server Status Test
A virtual server is a traffic-management object on the BIG-IP system that is represented by an IP address and a service. Clients on an external network can send application traffic to a virtual server, which then directs the traffic according to your configuration instructions. The main purpose of a virtual server is often to balance traffic load across a pool of servers on an internal network. Virtual servers increase the availability of resources for processing client requests.
Not only do virtual servers distribute traffic across multiple servers, they also treat varying types of traffic differently, depending on your traffic-management needs. Therefore, the avalibility of the virtual servers in the system is imperative for balancing the load. The F5 virtual Servers test exactly helps administrators in identifying the availability status of the virtual servers.
This test reports the current availability status of each virtual server in a pool and if the virtual server is available, this tests reports the current activity status of each virtual server.
Target of the test : A Big-IP/F5 Local Traffic Manager
Agent deploying the test : An external agent
Outputs of the test : One set of results for each virtual server in the pools configured on a traffic manager
| Parameter | Description |
|---|---|
|
Test period |
How often should the test be executed |
|
Host |
The IP address of the host for which this test is to be configured. |
|
SNMPPort |
The port at which the monitored target exposes its SNMP MIB; the default is 161. |
|
SNMPVersion |
By default, the eG agent supports SNMP version 1. Accordingly, the default selection in the SNMPversion list is v1. However, if a different SNMP framework is in use in your environment, say SNMP v2 or v3, then select the corresponding option from this list. |
|
SNMPCommunity |
The SNMP community name that the test uses to communicate with the firewall. This parameter is specific to SNMP v1 and v2 only. Therefore, if the SNMPVersion chosen is v3, then this parameter will not appear. |
|
Username |
This parameter appears only when v3 is selected as the SNMPversion. SNMP version 3 (SNMPv3) is an extensible SNMP Framework which supplements the SNMPv2 Framework, by additionally supporting message security, access control, and remote SNMP configuration capabilities. To extract performance statistics from the MIB using the highly secure SNMP v3 protocol, the eG agent has to be configured with the required access privileges – in other words, the eG agent should connect to the MIB using the credentials of a user with access permissions to be MIB. Therefore, specify the name of such a user against this parameter. |
|
Context |
This parameter appears only when v3 is selected as the SNMPVERSION. An SNMP context is a collection of management information accessible by an SNMP entity. An item of management information may exist in more than one context and an SNMP entity potentially has access to many contexts. A context is identified by the SNMPEngineID value of the entity hosting the management information (also called a contextEngineID) and a context name that identifies the specific context (also called a contextName). If the Username provided is associated with a context name, then the eG agent will be able to poll the MIB and collect metrics only if it is configured with the context name as well. In such cases therefore, specify the context name of the Username in the Context text box. By default, this parameter is set to none. |
|
AuthPass |
Specify the password that corresponds to the above-mentioned Username. This parameter once again appears only if the SNMPversion selected is v3. |
|
Confirm Password |
Confirm the AuthPass by retyping it here. |
|
AuthType |
This parameter too appears only if v3 is selected as the SNMPversion. From the AuthType list box, choose the authentication algorithm using which SNMP v3 converts the specified username and password into a 32-bit format to ensure security of SNMP transactions. You can choose between the following options:
|
|
EncryptFlag |
This flag appears only when v3 is selected as the SNMPversion. By default, the eG agent does not encrypt SNMP requests. Accordingly, the this flag is set to No by default. To ensure that SNMP requests sent by the eG agent are encrypted, select the Yes option. |
|
EncryptType |
If the EncryptFlag is set to Yes, then you will have to mention the encryption type by selecting an option from the EncryptType list. SNMP v3 supports the following encryption types:
|
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EncryptPassword |
Specify the encryption password here. |
|
Confirm Password |
Confirm the encryption password by retyping it here. |
|
Timeout |
Specify the duration (in seconds) within which the SNMP query executed by this test should time out in this text box. The default is 10 seconds. |
|
Data Over TCP |
By default, in an IT environment, all data transmission occurs over UDP. Some environments however, may be specifically configured to offload a fraction of the data traffic – for instance, certain types of data traffic or traffic pertaining to specific components – to other protocols like TCP, so as to prevent UDP overloads. In such environments, you can instruct the eG agent to conduct the SNMP data traffic related to the monitored target over TCP (and not UDP). For this, set this flag to Yes. By default, this flag is set to No. |
|
EngineId |
This parameter appears only when v3 is selected as the SNMPVersion. Sometimes, the test may not report metrics when AES192 or AES256 is chosen as the Encryption type. To ensure that the test report metrics consistently, administrators need to set this flag to Yes. By default, this parameter is set to No. |
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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:
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| Measurements | Description | Measurement Unit | Interpretation | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Virtual server available status |
Indicates the current status of this virtual server. |
|
The values that this measure can report and its numeric equivalents are mentioned in the table below:
Note: By default, this measure can report the Measure Values mentioned above while indicating the current status of the virtual server. However, the graph of this measure is indicated using the numeric equivalents 0 - 5 only. |
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|
Virtual server activity status |
Indicates the current activity status of this virtual server as specified by the user. |
|
This measure appears only if the Virtual server available status measure reports the Measure Value Available. The values that this measure can report and its numeric equivalents are mentioned in the table below:
Note: By default, this measure can report the Measure Values mentioned above while indicating the current activity status of the virtual server. However, the graph of this measure is indicated using the numeric equivalents 0 - 3 only. |
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|
Virtual server health |
Indicates how healthy this virtual server is. |
Percent |
If the value of this measure is 100, it implies that the virtual server is healthy and running. If this measure reports the value 0, it implies that virtual server is unhealthy. |
