Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Bedienungsanleitung Seite 39

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SNMP, RMON, BOOTP, DHCP, and RARP Concepts
114070 Rev. B 2-7
Each 32-bit value is accompanied by three variable bindings that convey the event
string that describes the trap condition, the slot that hosts the entity that generated
the trap, and the trap severity (refer to T
able 2-1).
Refer to Event Messages for Routers and BNX Platforms for detailed information
about the SNMP trap format.
Thresholds
SNMP uses a management information base (MIB) to manage the router. The
MIB includes an extensive collection of statistics (MIB variables) that track the
router’s performance and provide early warnings of abnormal operating
conditions.
With the Site Manager threshold feature, you can configure the agent to
automatically notify you when specific statistics (or instances of the variable)
reach certain levels.
You can set a threshold for any integer, counter, gauge, or time-tick variable in the
MIB. Using the threshold parameters you
Select the polling interval, which specifies how often the agent checks the
statistic to see if its value has reached the threshold
Set three threshold values (high, medium, and low)
Specify the threshold action as Lessthan or Greaterthan
For information about setting thresholds, refer to “Configuring Thresholds” in
Chapter 3.
When the statistic reaches the threshold, the agent generates an event. You specify
the severity level at which you want the manager to log the event. T
able 2-1 lists
the available severity levels and their suggested meanings. Depending on how you
configure the SNMP trap parameters (refer to “Configuring Traps on the Router”
in Chapter 3), the agent may also send the threshold exception as an SNMP trap.
The Site Manager threshold feature is functionally similar to the RMON Alarm
and Event facility, except for some minor differences. The Site Manager threshold
feature provides three-tiered thresholds and defines a user-definable hysteresis
mechanism. The RMON Alarm and Event facility provides a two-tiered
proprietary thresholds system.
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