PVM Ethernet Details Test

To provide redundancy for the network, everRun selects a single network adapter – say, an Ethernet adapter - from a protected VM on each XenServer in a pool to create a single network interface in the virtual environment. This virtual adapter can then be treated and configured as any other adapter. It presents a single IP address, a single MAC address, and a single hostname to the network. To accomplish this, everRun replaces the MAC address from each Ethernet adapter it selects with a single MAC address and controls the I/O to transmit out of only one at any given time. If any Ethernet adapter fails, everRun immediately and automatically uses the other without interruption to the application. However, if the PVM’s virtual adapter fails or experiences errors, then network redundancy also be affected. To avoid such eventualities, the network adapter should be closely monitored. This what exactly the PVM Ethernet Details test does.

Target of the test : An everRun PVM

Agent deploying the test : An internal agent

Outputs of the test : One set of results for each Ethernet adapter being monitored.

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 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:

  • MD5 – Message Digest Algorithm
  • SHA – Secure Hash Algorithm

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 this 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:

  • DES – Data Encryption Standard
  • AES – Advanced Encryption Standard

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.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

State

Indicates the current operational state of this PVM Ethernet adapter.

 

The values that this measure can take and their corresponding numeric values are discussed in the table below:

Measure Value Numeric Value
Good 0
Transitioning 5
Unknown 7
Idle 8
Disabled 13
Degraded 14
offline 81
Failed 91

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the current operational state of an Ethernet adapter. However, in the graph of this measure, state will be represented using the corresponding numeric equivalents only.

Severity

Indicates the current health state of this Ethernet adapter.

 

The values that this measure can take and their corresponding numeric values are discussed in the table below:

Measure Value Numeric Value
Good 0
Unknown 2
Informational 4
Warning 81
Error 91

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the current health state of an Ethernet adapter. However, in the graph of this measure, state will be represented using the corresponding numeric equivalents only.