SNMP Manager

Description:

An SNMP Manager is an application that performs the operational roles of generating requests to modify and retrieve management information, and receiving the requested information and trap-event reports that are generated by the SNMP agent. SNMP management applications such as Castlerock (SNMPc), and AdRem can be used and have been verified to operate on the IMG. The IMG is not limited to the SNMP manager applications mentioned. Other applications can be utilized but the applications mentioned above have be verified. To configure an SNMP Manager on the IMG follow the preocedures below

 

Accessing this Pane:

Dialogic IMG EMS -> New External Network Elements -> SNMP Managers -> SNMP Manager

sc_tree_snmp_manager.png

 

Maximum Objects:

4 SNMP Managers per GCEMS

 

Related Topics:

An Overview of SNMP

Configuring SNMP

Configuring SNMP Managers

Configuring SNMP Agent

 

ClientView Pane:

sc_snmp_manager.png

 

 

Field Descriptions:

Engine ID:

The local engine ID is defined as the unique identifier of an SNMPv3 engine, and is used for identification and not addressing. The IMG does not support SNMPv3 so any number entered into this field will work. To enter the Engine ID, click in the Engine ID field and an Enter Value screen will appear. Enter the Engine ID in this screen.

 

SNMP User Name:

Enter a username that identifies this SNMP Manager. Click in the SNMP Username field and enter the name.

 

SNMP  Community Name:

The SNMP Agent could require that an SNMP Manager send a particular password with each message. The SNMP Agent would then verify whether the SNMP Manager is authorized to access MIB information. This is used for security in SNMPv2. Most often there is one community string which is used for read-only access to an SNMP Agent. The default value for this community string is often "public". Using this community string like a password, the NMS can retrieve data from network elements. Click in the SNMP Community Name field and enter the name.

 

Note: When configuring multiple SNMP Managers to communicate with one SNMP agent, the SNMP Community Name must have the same value for each SNMP Manager created in ClientView.

 

SNMP Manager IP Address:

Enter the IP address of the SNMP Manager. Click in the SNMP Manager IP address field and an Enter IP address box will appear. Enter IP address here

 

SNMP Trap Port:

The port that SNMP traps are received on. By Default port 162 is displayed as per standard RFCs for SNMP. To change the port click in the SNMP Trap port field and enter the new trap port number.

Note: SNMP request messages are received on Port 161.

 

SNMP Version:

The version of SNMP is displayed here. Click in the SNMP version field and a drop down menu will display the two versions of SNMP the IMG supports. The IMG supports.

SNMP v1

SNMP v2c

 

SNMP Timeout (ms):

The time to wait for an ACK from an SNMP Manager before timing out. The value entered will be in milliseconds. The default is set to 1500 ms (1.5 seconds). If value needs to be changed, click in the SNMP Timeout field and enter the new value

 

Trap Retries:

The number of times to resend a trap to the SNMP manager. The Default is three. To change, click in the Trap Retries field and select from drop down menu 0-5

 

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Note: The next three fields (Trap Notify Type, Trap Subtree, and Trap Notify Filter) are used for filtering of traps sent from the SNMP Agent. The IMG can be configured to not send a specific set of traps or can also be configured to only send a specific set of traps. This is all done to limit the amount of messages being sent between the SNMP Agent and the SNMP Manager. Below is a short description of each field and also examples of how the filtering works

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The following fields relate to filtering traps. See examples below.

 

 

Trap Notify Type:

This field has to do with the filtering of specific traps. The IMG can filter which traps to send or not send to each of the SNMP managers configured. This is done in the Trap Notify Filter field. The two selections from the drop down menu are:

Inclusive - Include traps that match the filtering configured. (Default)

Exclusive - Exclude traps that match the filtering configured.

 

Trap Subtree:

In this field, enter the OID to be filtered. If the set of OID's you would like to either Include or Exclude is 1.3.6.1.2.1.x.x.x. then enter 1.3.6.1.2.1 in this field.

 

Trap  Notify Filter:

Use this field to filter out specific OID's. Use this field as a bit mask with a 1 indicating an exact match and a 0 indicating a "wildcard" or a don't care. For example: If the Trap Subtree field has 1.3.6.1.0.6 and the bit mask is 1.1.1.1.0.1 then 1.3.6.1.0.6, 1.3.6.1.1.6,  1.3.6.1.2.6 all the way up through 1.3.6.1.9.6 are filtered and will be either included or excluded depending on the Trap Notify Type field. OID 1.3.6.1.6.7 is not filtered and will be sent.

 

 

Trap Configuration Examples:

See the link Configuring SNMP for examples of SNMP trap filtering.