Enterprise Switch User Guide

34 C
HAPTER
3: M
ANAGING
D
EVICES
The following events occur during an overheat condition:
1
The Master EME character display shows the word
TEMP
2
If an SNMP agent is present in the chassis, power management informs
the SNMP agent of the overheat condition.
3
A 1-minute delay is provided, during which the Master EME and external
management entities are notified of the overheat condition.
4
Approximately 1 minute later, the EME initiates a power-off strategy to all
CoreBuilder 9000 modules installed in the overheat management areas
where the overheat condition was detected.
5
The overheat indication
TEMP
stops when the chassis internal operating
temperature falls below the temperature threshold and stays there for
15 minutes.
The EME does
not
power off modules that occupy slots outside of
affected overheat management areas. This overheat power-off strategy is
based on the power class setting and slot location of each installed switch
fabric module and interface module.
The two overheat auto-power-down modes are:
■
Enable
— Causes slots to power off automatically when the chassis
overheats.
■
Disable
— (the default) Causes the EME to send notification to
network management applications, but the chassis keeps operating.
Power Class
A
power class setting
is a value in the range of 1 through 10 that is
assigned to each module. The highest setting is 10. The EME uses the
power class settings to manage power among the modules in the chassis,
and to determine the order in which it powers on and powers off
installed modules.
Each CoreBuilder 9000 Switch module is shipped with a default power
class setting:
Module Default Power Class Setting
EME 10
EMC 10
Interface Module 3
Switch Fabric Module 9