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EMC M&R | Watch4net | ViPR SRM - SNMP-Collector - How to selectively poll specific SNMP table rows, How to prevent the SNMP-Collector from polling unwanted table rows such as intefaces (323345)

Last Updated: 5/29/2020Categories: How toTotal Views: 2699Language:
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Resolution

By default, the SNMP collector will poll every row in a table.

In a large environment with many devices, polling table rows which contain data that is irrelevant can result in:

1. Unwanted metrics in the database, wasting space
2. Unnecessary utilization of network bandwidth during polling
3. Unnecessary utilization of device resources (CPU, memory) during polling

Example:

A polled device contains the following interfaces which in turn populate the SNMP table ifTable (.1.3.6.1.2.1.2.2):

However, we are only interested in polling interface metrics for Ethernet0/0 and Ethernet0/1 (highlighted above) on this device.

How can you configure the SNMP-Collector mask to selectively poll only the table rows pertaining to these interfaces?

To selectively poll table rows, you can add a "tableRowSpecificationFile" parameter to the snmp-table object definition in the mask configuration. Within this file you can set the filter on which table rows you wish to poll.

/opt/APG/Collecting/SNMP-Collector/<instance>/conf/snmp-masks.xml

Example: The following mask polls ifTable (.1.3.6.1.2.1.2.2):

1. Add the following text in bold to the snmp-table object definition:

<snmp-table id="ifTable-1429605968903" name="ifTable" oid=".1.3.6.1.2.1.2.2" tableIndex=".1.100" indexEntryMask="oid._._.100" partType="Interface" nextRefTableColIdxOid=".1.100" cacheAllSnmpReferenceTables="false" sortOnOid="false" matchNFirstOidSuffixOnly="0" tableRowSpecificationFile="conf/interfacesToPoll.txt">

2. Create the tableRowSpecificationFile in the conf directory.
In this tableRowSpecificationFile "interfacesToPoll.txt" we willinstruct the SNMP collector to only poll the rows from ifTable for ifIndex 1 and 2 (Ethernet0/0 and Ethernet0/1) with the following line:

ip      A.B.C.D     ifindex 1|2

Where A.B.C.D is the IP address used to poll the device in question.
The parameters in this file must be TAB separated.

To do this for multiple devices, you need to add a line per device, specifying the ifIndex values for the interfaces you want to poll.
Example:

ip      A.B.C.D     ifindex 1|2
ip      A.B.C.E     ifindex 1|3|7|23
ip      A.B.C.F     ifindex 7|17|62
ip      A.B.C.G     ifindex 128|77|43|98|12
....

After making these changes, restart the SNMP-Collector for them to take effect
Linux:  /opt/APG/bin/manage-module.sh service restart collector-manager <instance>
Windows:   C:\Program Files\APG\bin\manage-module.cmd service restart collector-manager <instance>

Related Information

For more information on configuring the SNMP Collector refer to APG-SNMP-Collector-Admin-Guide.pdf in the Doc folder of any installation
Linux: /opt/APG/Doc
Windows:  C:\Program Files\APG\Doc

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