By selecting the Property Sheet view of an SnmpNetwork object, you can view and configure the following SNMP properties that apply to the entire network:
A description of each of the SNMP specific properties follows. For more details on properties specific to all types of network objects, refer to the NiagaraAX-3.x Drivers Guide.
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Poll Scheduler
Used to configure device-level polling. See the NiagaraAX-3.x Drivers Guide for details on configuring the Poll Scheduler.
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Enterprise
Displays the enterprise OID (Object Identifier) information for the station.
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Contact
Specifies the system contact information for the station. This contact information is stored for the station and is read/write accessible via SNMP requests made to the station for OID 1.3.6.1.2.1.1.4.0.
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System Name
Specifies the system name information for the station. This name information is stored for the station and is read/write accessible via SNMP requests made to the station for OID 1.3.6.1.2.1.1.5.0.
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Location
Specifies the system location information for the station. This location information is stored for the station and is read/write accessible via SNMP requests made to the station for OID 1.3.6.1.2.1.1.6.0.
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SNMP Receive Requests
Specifies whether the ability for SNMP request messages to be received by the station (only supports receiving GET, GETNEXT, or SET SNMPv1 or SNMPv2 messages) is enabled or disabled. When enabled, reception of SNMP request messages from external SNMP sources is possible (subject to the constraints placed on the reception of SNMP requests by the next six property fields). When disabled, reception of SNMP requests is not possible and any requests sent to it will be dropped.
When the ability to receive SNMP request messages (or SNMP trap messages) is enabled, your station may become insecure and
subject to unauthorized SNMP requests from other sources. The additional properties for limiting the SNMP requests processed
(by restricting the source IPs that may send SNMP requests and adding the ability to change the community string fields for
read/write access) do not ensure the security of your station since no encryption is used. It is highly recommended that you
only enable the reception of SNMP requests (or SNMP traps) when your station is on a secure network where SNMP requests from
unauthorized sources are restricted.
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SNMP Receive Port
Specifies the port that the station uses to receive SNMP requests from external SNMP sources (such as a network manager). The default is port 161, the standard SNMP port.
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Ignore Requests From Unrecognized Sources
Specifies whether to enable or disable the ability for SNMP request messages to be received from only recognized sources (specified in the 'Recognized Sources' property). When enabled, a received SNMP request message is first checked for its source IP, and if this source IP matches any one of the source IP addresses specified in the 'Recognized Sources' field, the request is processed. If the source IP does not match, then the request is disregarded. When this property is disabled, SNMP requests from any source IP will be processed.
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Recognized Sources
This component can be configured with source IP addresses to specify a list of recognized network managers. This list is used if the 'SNMP Receive Requests' and 'Only Accept Requests From Recognized Sources' properties are both enabled. It contains a list of source IP addresses that will be searched whenever an incoming SNMP request is received, and if the source of that request matches a source IP in this list, then the request will be processed. Otherwise, the request will be dropped. Useful for security purposes to ensure that the station only responds to known sources. This component has two actions used to configure the source IP address list:
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Add Address
Prompts the user to enter a source IP address to add to the list. As source IP are added, they appear in the list as 'Source_IP_Address' entries under the component. These entries are editable.
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Clear All Addresses
Clears the list of source IP addresses. All 'Source_IP_Address' entries will be removed.
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Check Community On Requests
Specifies whether to enable or disable checking the community string field on a received SNMP request message before processing the request. When enabled, a received SNMP request message is first checked for its community string, and if this community string matches the community string specified in the 'Read Only Community' field (for GET or GETNEXT requests) or the 'Read Write Community' field (for GET, GETNEXT, or SET requests), the request is processed. If the community string does not match for the appropriate read/write access, then the request is disregarded. When this property is disabled, SNMP requests with any community string field will be processed.
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Read Only Community
Only valid if the 'Check Community On Requests' property is enabled, this property specifies the community string field that incoming SNMP request messages must contain in order to process a read-only request (GET or GETNEXT request). The default value is “public”.
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Read Write Community
Only valid if the 'Check Community On Requests' property is enabled, this property specifies the community string field that incoming SNMP request messages must contain in order to process a read-write request (GET, GETNEXT, or SET request). The default value is “public”. NOTE: This property has priority over the 'Read Only Community' property.
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SNMP Receive Traps
Specifies whether to enable or disable the ability for SNMP trap messages to be received by the station. When enabled, reception of SNMP trap messages from external SNMP devices is enabled, and any received trap messages will be routed to the Alarm Class specified by the 'Alarm Class For Received Traps' property, subject to the constraints of the 'Only Process Recognized Traps' property.
When the ability to receive SNMP request messages (or SNMP trap messages) is enabled, your station may become insecure and
subject to unauthorized SNMP requests from other sources. The additional properties for limiting the SNMP requests processed
(by restricting the source IPs that may send SNMP requests and adding the ability to change the community string fields for
read/write access) do not ensure the security of your station since no encryption is used. It is highly recommended that you
only enable the reception of SNMP requests (or SNMP traps) when your station is on a secure network where SNMP requests from
unauthorized sources are restricted.
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SNMP Receive Traps Port
Specifies the port that the station uses to receive SNMP trap messages from external SNMP devices. The default is port 162, the standard SNMP traps port.
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Default Network Manager Ip Address
Specifies the default IP address of the network manager to use for reporting information. Any SnmpRecipients configured to use the SnmpNetwork's default network manager will report SNMP trap messages generated by the station to the host at this IP address (see SnmpRecipient Configuration). This default network manager IP will also get sent a 'Cold Start' trap message from the Niagara station when the station first starts.
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Default Network Manager Traps Port
Specifies the port to use for outgoing SNMP trap messages sent to the default network manager (i.e. the port on the default network manager where SNMP trap messages are received). This field defaults to port 162 - the standard SNMP traps port.
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Default Network Manager Traps Community
Specifies the community string field to use for outgoing SNMP trap messages (sent to the default network manager). The default value is “public”.
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This property allows you to specify the maximum size of the Snmp Alarm Table. The default size is 500 records. Using this property, you can disable the Snmp Alarm Table by setting the value to zero. The purpose of limiting the table size is to conserve memory. You can also choose to disable Snmp alarm storage by choosing to set the SnmpRecipient’s “Snmp Alarm Table” property to “Do not Store Received”.