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Using Syslog Messaging to Monitor Router Events

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Filtering by Event Severity Level

Each event message generated by the router software has a unique severity level.

You can use severity levels to filter these messages (that is, you define a severity

mask for the filter).

Syslog uses the severity levels as criteria for selecting and forwarding only the

types of messages you want a remote host to receive.

An entity filter passes only messages that have a severity level equal to any you

specified in the message severity mask. You define severity levels by setting a

value for the wfSyslogEntFltrSevMask filter attribute in the router’s active MIB.

For example, if an entity filter for FTP has a Message Severity Mask of “wfi,” the

filter passes only FTP event messages that have a severity level of warning (w),

fault (f), or information (i).

Filtering by Slot Number

The router stores event messages in the log buffer associated with each slot. You

can configure an entity filter to select for forwarding only event messages logged

on the slots you specify. You must specify at least one slot in the range 1 to 14,

where the slot numbers depend on the router model.

You define a range of slot numbers for an entity filter by specifying:

• An upper boundary number (MIB object wfSyslogFltrSlotUppBnd)

• A lower boundary number (MIB object wfSyslogFltrSlotLowBnd)

Syslog considers the upper and lower boundary numbers as part of the range. For

example, you can configure an entity filter for FTP with an event number range of

5 to 27 and a slot number range of 2 to 5. In this case, Syslog forwards to the

associated remote host FTP log messages numbered 5 to 27 logged on slots 2 to 5

only.

Note:

Syslog checks the message severity mask only when you accept the

default event message number range of 0 to 255 for the same filter. This causes

Syslog to ignore event numbers as criteria for selecting and forwarding

messages to a remote host.

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Avaya Using Technician Interface Software Bedienungsanleitung Seite 295