SNMP Test

The SNMP test enables administrators to monitor the SNMP traffic processed by the Citrix ADC appliance, so they can promptly capture:

Sudden and significant surges in the SNMP traffic;
Drops in SNMP requests;
Abnormal SNMP messages;
Errors in SNMP traffic
SNMP packets dropped and the reasons for the same;

Target of the test : A Citrix ADC VPX/MPX

Agent deploying the test : A remote agent

Outputs of the test : One set of results for the Citrix ADC VPX/MPX appliance 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 being configured.
NetScaler Username, NetScaler Password, and Confirm Password	To monitor a ADC device, the eG agent should be configured with the credentials of a user with read-only privileges to the target ADC device. Specify the credentials of such a user in the NetScaler Username and NetScaler Password text boxes. Then, confirm the password by retyping it in the Confirm Password text box.
SSL	The eG agent collects performance metrics by invoking NITRO (ADC Interface Through Restful interfaces and Objects) APIs on the target ADC device. Typically, the NITRO APIs can be invoked through the HTTP or the HTTPS mode. By default, the eG agent invokes the NITRO APIs using the HTTPS mode. This is why, the SSL flag is set to Yes by default. If the target ADC device is not SSL-enabled, then the NITRO APIs can be accessed through the HTTP mode only. In this case, set the SSL flag to No.

Measurements made by the test
Measurement	Description	Measurement Unit	Interpretation
SNMP packets received	Indicates the number of SNMP packets received during the last measurement period.	Number	Track the variations in the values of these measures across time to promptly capture steady / sporadic rise in SNMP traffic.
SNMP packets transmitted	Indicates the number of SNMP packets transmitted during the last measurement period.	Number
Get requests received	Indicates the number of SNMP Get-Request PDUs that have been accepted and processed during the last measurement period.	Number
Get-next requests received	Indicates the number of SNMP Get-Next PDUs that have been accepted and processed during the last measurement period.	Number
Get-bulk requests received	Indicates the number of SNMP Get-Bulk PDUs that have been accepted and processed during the last measurement period.	Number
Responses transmitted	Indicates the number of SNMP Get-Response PDUs that have been generated by the ADC during the last measurement period.	Number
Traps messages transmitted	Indicates the number of SNMP Trap PDUs that have been generated by the ADC during the last measurement period.	Number
Requests dropped	Indicates the number of SNMP requests dropped during the last measurement period.	Number	Ideally, the value of this measure should be 0.
ASN.1/BER errors in requests	Indicates the number of ASN.1 or BER errors encountered when decoding received SNMP Messages during the last measurement period.	Number	ASN.1 is a flexible notation that allows one to define a variety data types, from simple types such as integers and bit strings to structured types such as sets and sequences, as well as complex types defined in terms of others. BER describes how to represent or encode values of each ASN.1 type as a string of eight-bit octets.
Unsupported SNMP version	Indicates the number of SNMP messages received, which were for an unsupported SNMP version during the last measurement period.	Number	Ideally, the value of this measure should be 0.
Unknown community name	Indicates the number of SNMP messages received, which used an SNMP community name not known to the ADC during the last measurement period.	Number	Ideally, the value of this measure should be 0.
No permission on community	Indicates the number of SNMP messages received during the last measurement period that represented an SNMP operation which was not allowed by the SNMP community named in the Message.	Number	Ideally, the value of this measure should be 0.
Unsupported security level	Indicates the number of SNMP packets that were dropped during the last measurement period because they requested a security level that is unknown to the ADC appliance or otherwise unavailable.	Number	Ideally, the value of this measure should be 0.
Not in time window	Indicates the number of he SNMP packets that are dropped during the last measurement period because they appeared outside the Window of the authoritative SNMP engine.	Number	Ideally, the value of this measure should be 0.
Unknown user name	Indicates the number of SNMP packets that are dropped during the last measurement period because they referenced a user that is not known to the SNMP engine..	Number	Ideally, the value of this measure should be 0.
Unknown engine id	Indicates the number of SNMP packets that are dropped during the last measurement period because they referenced an SNMP engine ID that is not known to the ADC appliance.	Number	Ideally, the value of this measure should be 0.
Wrong digest value	Indicates the number of SNMP packets that were dropped during the last measurement period because they do not contain the expected digest value.	Number	Ideally, the value of this measure should be 0.
Decryption errors	Indicates the number of SNMP packets that were dropped during the last measurement period because they cannot be decrypted.	Number	Ideally, the value of this measure should be 0.