Allied Telesis AT-iMG634 - R2 User's Guide download pdf (Page 131)

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Configuring notification filters SNMP

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iMG/RG Software Reference Manual (System Configuration)

1.6.4 Configuring notification filters

After the SNMP entity has been properly configured to send notifications, the SNMP engine will dutifully send

SNMPv1, SNMPv2c, and SNMPv3 notification messages on behalf of the notification generator application.

Depending upon the nature of the specific notification generator application, this may result in the sending of

few or many notifications.

A well-designed notification generator application will send enough notifications to be useful to a notification

receiver application, but not too many notifications that it produces “noise”.

The SNMPv3 administration framework allows an SNMP entity which contains both a notification receiver appli-

cation and a command generator application to “turn down the noise” by filtering notifications at the source.

In the SNMP entity containing the notification originator, there are two MIB tables which control notification fil-

tering: the snmpNotifyFilterProfileTable and the snmpNotifyFilterTable. By sending SNMP

Set requests to create new rows in these tables, the SNMP entity with the notification receiver application can

specify what kinds of notifications should not be sent to it.

This section describes the snmpNotifyFilterProfileTable and the snmpNotifyFilterTable in

terms of the corresponding entries in the snmpd.cnf file. Using this information, some notification filters can

be pre-configured before the

AGENT entity is launched.

Configuring a notification filter is a process that requires two steps:

• Create a notification filter.

• Associate the notification filter with one or more notification parameters.

1.6.4.1 Creating a notification filter

To create a notification filter, add one or more snmpNotifyFilterEntry definition in the snmpd.cnf file

accordingly the following syntax:

snmpNotifyFilterEntry.<snmpNotifyFilterProfileName> <snmpNotifyFil-

terSubtree> <snmpNotifyFilterMask> <snmpNotifyFilterType> <snmpNoti-

fyFilterStorageType>

snmpNotifyFilterProfileName

is a human readable string representing the name of this notification filter.

snmpNotifyFilterSubtree

is an OID which specifies the MIB sub-tree containing notifications objects to be filtered. The value of this OID

may be specified in dotted-decimal format or by the English name.

snmpNotifyFilterMask

modifies the set of notifications and objects identified by snmpNotifyFilterSubtree (a detailed explana-

tion follows).This object is an OctetString represented as a sequence of hexadecimal numbers separated by

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