Environmental Monitoring and Power Management

About Environmental Monitoring

Environmental monitoring of chassis components provides early warning indications of possible component failure. This warning helps you to ensure the safe and reliable operation of your system and avoid network interruptions.

This section describes how to monitor critical system components so that you can identify and rapidly correct hardware-related problems.

Using CLI Commands to Monitor your Environment

Enter the show environment [all | counters | history | location | sensor | status | summary | table ] command to display system status information. Keyword descriptions are listed in the following table.

Table 1. show environment Keyword Descriptions

Keyword

Purpose

all

Displays a detailed listing of all the environmental monitor parameters (for example, the power supplies, temperature readings, voltage readings, and so on). This is the default.

counters

Displays operational counters.

history

Displays the sensor state change history.

location

Displays sensors by location.

sensor

Displays the sensor summary.

status

Displays field-replaceable unit (FRU) operational status and power and power supply fan sensor information.

summary

Displays the summary of all the environment monitoring sensors.

table

Displays a sensor state table.

Displaying Environment Conditions

Supervisor modules and their associated line cards support multiple temperature sensors per card. The environment condition output includes the temperature reading from each sensor and the temperature thresholds for each sensor. These line cards support three thresholds: warning, critical, and shutdown.

The following example illustrates how to display the environment condition on a supervisor module. The thresholds appear within parentheses. 

device#show environment 

Number of Critical alarms:  0
Number of Major alarms:     0
Number of Minor alarms:     0

Slot    Sensor       Current State       Reading    Threshold(Minor,Major,Critical,Shutdown)
----    ------       -------------       -------    ---------------------------------------
 R0    HotSwap: Volts   Normal           53    V DC   	na
 R0    HotSwap: Power   Normal           231   Watts  	na
 R0    Temp: Coretemp   Normal           46    Celsius	(107,117,123,125)(Celsius)
 R0    Temp: DopplerD   Normal           55    Celsius	(107,117,123,125)(Celsius)
 R0    V1: VX1          Normal           845   mV     	na
 R0    V1: VX2          Normal           1499  mV     	na
 R0    V1: VX3          Normal           1058  mV     	na
 R0    V1: VX4          Normal           849   mV     	na
 R0    V1: VX5          Normal           1517  mV     	na
 R0    V1: VX6          Normal           1306  mV     	na
 R0    V1: VX7          Normal           1007  mV     	na
 R0    V1: VX8          Normal           1098  mV     	na
 R0    V1: VX9          Normal           1205  mV     	na
 R0    V1: VX10         Normal           1704  mV     	na
 R0    V1: VX11         Normal           1208  mV     	na
 R0    V1: VX12         Normal           1804  mV     	na
 R0    V1: VX13         Normal           2518  mV     	na
 R0    V1: VX14         Normal           3288  mV     	na
 R0    Temp:   outlet   Normal           39    Celsius	(55 ,65 ,75 ,100)(Celsius)
 R0    Temp:    inlet   Normal           35    Celsius	(45 ,55 ,65 ,72 )(Celsius)

The following example illustrates how to display the LED status on a supervisor module.

device#show hardware led

Current Mode: STATUS

SWITCH: C9407R
SYSTEM: AMBER

SUPERVISOR: ACTIVE 
STATUS: (10) Te3/0/1:BLACK Te3/0/2:BLACK Te3/0/3:BLACK Te3/0/4:BLACK Te3/0/5:BLACK Te3/0/6:BLACK Te3/0/7:BLACK Te3/0/8:BLACK Fo3/0/9:BLACK Fo3/0/10:BLACK 
BEACON: BLACK

RJ45 CONSOLE: GREEN
FANTRAY STATUS: GREEN
FANTRAY BEACON: BLACK
POWER-SUPPLY 1 BEACON: BLACK
POWER-SUPPLY 3 BEACON: BLACK

Displaying On Board Failure Logging (OBFL) information

The OBFL feature records operating temperatures, hardware uptime, interrupts, and other important events and messages that can assist with diagnosing problems with line cards and supervisor modules installed in a switch. Data is logged to files stored in nonvolatile memory. When the onboard hardware is started up, a first record is made for each area monitored and becomes a base value for subsequent records. The OBFL feature provides a circular updating scheme for collecting continuous records and archiving older (historical) records, ensuring accurate data about the system. Data is recorded in one of two formats: continuous information that displays a snapshot of measurements and samples in a continuous file, and summary information that provides details about the data being collected. The data is displayed using the show logging onboard command. The message “No historical data to display” is seen when historical data is not available. 

Switch#show logging onboard RP active voltage detail

--------------------------------------------------------------------------------
VOLTAGE SUMMARY INFORMATION
--------------------------------------------------------------------------------
Number of sensors          : 16
--------------------------------------------------------------------------------
Sensor                    ID         Normal Range          Maximum Sensor Value 
--------------------------------------------------------------------------------
SYSTEM Rail-5.0           0          0 - 5                 0                    
SYSTEM Rail-0.9PEX        1          0 - 5                 1                    
SYSTEM Rail-0.9           2          0 - 5                 1                    
SYSTEM Rail-1.8           3          0 - 5                 0                    
SYSTEM Rail-3.3           4          0 - 5                 1                    
SYSTEM Rail-2.5           5          0 - 5                 1                    
SYSTEM Rail-1.5CPU        6          0 - 5                 1                    
SYSTEM Rail-1.5           7          0 - 5                 1                    
SYSTEM Rail-1.2           8          0 - 5                 1                    
SYSTEM Rail-1.1           9          0 - 5                 1                    
SYSTEM Rail-1.0           10         0 - 5                 1                    
SYSTEM Rail-0.9CPU        11         0 - 5                 1                    
SYSTEM Rail-0.85          12         0 - 5                 2                    
SYSTEM Rail-0.85DOPv
     13         0 - 5                 3                    
SYSTEM Rail-0.85DOPv^N     14         0 - 5                 5                    
SYSTEM Rail-0.85DOPv^O     15         0 - 5                 0                    

--------------------------------------------------------------------------------
Sensor Value
Total Time of each Sensor
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
No historical data

--------------------------------------------------------------------------------


--------------------------------------------------------------------------------
VOLTAGE CONTINUOUS INFORMATION
--------------------------------------------------------------------------------
Sensor                    ID
--------------------------------------------------------------------------------

SYSTEM Rail-5.0           0  
SYSTEM Rail-0.9PEX        1  
SYSTEM Rail-0.9           2  
SYSTEM Rail-1.8           3  
SYSTEM Rail-3.3           4  
SYSTEM Rail-2.5           5  
SYSTEM Rail-1.5CPU        6  
SYSTEM Rail-1.5           7  
SYSTEM Rail-1.2           8  
SYSTEM Rail-1.1           9  
SYSTEM Rail-1.0           10 
SYSTEM Rail-0.9CPU        11 
SYSTEM Rail-0.85          12 
SYSTEM Rail-0.85DOPv
     13 
SYSTEM Rail-0.85DOPv^N     14 
SYSTEM Rail-0.85DOPv^O     15 
--------------------------------------------------------------------------------
       Time Stamp   | Sensor Voltage 0V     
MM/DD/YYYY HH:MM:SS | Sensor Value 
--------------------------------------------------------------------------------
05/06/2015 16:42:51  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
05/06/2015 18:24:24  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
05/10/2015 17:53:42  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
08/30/2017 16:14:40  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
08/30/2017 23:34:24  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
08/31/2017 22:16:23  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 
09/01/2017 00:57:15  0  1  1  0  1  1  1  1  1  1  1  1  2  3  5  0 

--------------------------------------------------------------------------------

Emergency Actions

The chassis can power down a single card, providing a detailed response to over-temperature conditions on line cards. However, the chassis cannot safely operate when the temperature of the supervisor module itself exceeds the critical threshold. The supervisor module turns off the chassis’ power supplies to protect itself from overheating. When this happens, you can recover the switch only by cycling the power on and off switches on the power supplies or by cycling the AC or DC inputs to the power supplies.

Critical and shutdown temperature emergencies trigger the same action. The following table lists temperatureemergencies but does not distinguish between critical and shutdown emergencies.

Table 2. Emergency and Action

Case 1. Complete fan failure emergency.

SYSLOG message displays and the chassis shuts down.

Case 2. Temperature emergency on a line card.

Power down the line card.

Case 3. Temperature emergency on a power supply. When critical or shutdown alarm threshold is exceeded, all the power supplies will shut down.

Power cycle the device to recover from power supply shut down.

Case 4. Temperature emergency on the active supervisor module.

Power down the chassis.

System Alarms

Any system has two types of alarms: major and minor. A major alarm indicates a critical problem that could lead to system shutdown. A minor alarm is informational—it alerts you to a problem that could become critical if corrective action is not taken.

The following table lists the possible environment alarms.

Table 3. Possible Environmental Alarms

A temperature sensor over its warning threshold

minor

A temperature sensor over its critical threshold

major

A temperature sensor over its shutdown threshold

major

A partial fan failure

minor

A complete fan failure

Note 

A complete fan failure alarm does not result in system shutdown.

major

Fan failure alarms are issued as soon as the fan failure condition is detected and are canceled when the fan failure condition clears. Temperature alarms are issued as soon as the temperature reaches the threshold temperature. An LED on the supervisor module indicates whether an alarm has been issued.

When the system issues a major alarm, it starts a timer whose duration depends on the alarm. If the alarm is not canceled before the timer expires, the system takes emergency action to protect itself from the effects of overheating. The timer values and the emergency actions depend on the type of supervisor module.


Note

Refer to the Hardware Installation Guide for information on LEDs, including the startup behavior of the supervisor module system LED.

Table 4. Alarms on Supervisor Module

Event

Alarm Type

Supervisor LED Color

Description and Action

Card temperature exceeds the critical threshold.

Major

Red

Syslog message displays when the alarm is issued.

Card temperature exceeds the shutdown threshold.

Major

Red

Syslog message displays when the alarm is issued.

Chassis temperature exceeds the warning threshold.

Minor

Orange

Syslog message displays when the alarm is issued.

Chassis fan tray experiences partial failure.

Minor

Orange

Syslog message displays when the alarm is issued.

Chassis fan tray experiences complete failure.

Major

Red

Syslog message displays when the alarm is issued.

Power Management

This section describes the power management feature in the Cisco Catalyst 9400 Series Switches and the aspects of power management that you can control and configure. For information about the hardware, including installation, removal and power supply specifications, see the Cisco Catalyst 9400 Series Switches Hardware Installation Guide.

Power Supply Modes

Cisco Catalyst 9400 Series Switches offer combined and redundant configuration modes for power supplies.

Combined Mode

This is the default power supply mode.

The system operates on one to eight power supplies. All available power supplies are active and sharing power and can operate at up to 100 percent capacity.

Available power in the combined mode is the sum of the individual power supplies.

Redundant Mode

In a redundant configuration, a given power supply module can be either active, or in standby mode, and switch to active when required.

You can configure an n+1 or an n+n redundant mode.

  • n+1 redundant Mode—n number of power supply modules are active (n can be one to seven power supply modules). +1 is the power supply module reserved for redundancy.

    The default standby power supply slot is PS8. Specify a standby slot, by entering the power redundancy-mode redundant n+1 standby-PSslot command.

  • n+n redundant Mode—n number of power supplies are active and n number of power supply modules are configured as standby.

    The default standby slots for this mode are PS5 through PS8. Specify the standby slots, by entering the power redundancy-mode redundant n+n standby-PSslots command.

Example: show power detail

The following example shows the output for the show power detail command for the power supply. The show power detail command inlcudes the output of show power and show power module commmands.
Switch# show power detail
Power                                                       Fan States
Supply  Model No              Type  Capacity  Status        1     2     3     4
------  --------------------  ----  --------  ------------  -----------------------
PS1     C9400-PWR-3200AC      AC    1570 W    active        good  good  good  good 
PS3     C9400-PWR-3200AC      AC    3200 W    active        good  good  good  good 

PS Current Configuration Mode : Combined
PS Current Operating State    : Combined

Power supplies currently active    : 2
Power supplies currently available : 2

Power Summary          Maximum
 (in Watts)    Used    Available
-------------  ------  ---------
System Power   1340    4770     
Inline Power   0       0        
-------------  ------  ---------
Total          1340    4770     


Automatic Linecard Shutdown : Disabled
Power Budget Mode           : Dual Sup

                           autoLC    Power                                  Out of  In
Mod  Model No              Priority  State     Budget  Instantaneous  Peak  Reset   Reset
---  --------------------  --------  --------  ------  -------------  ----  ------  -----
3    C9400-SUP-1           0         accepted  400     194            207   400     130  
4    C9400-SUP-1           0         ---       400     --             --    0       130  
--   Fan Tray              0         accepted  540     --             --    540     --   
---  --------------------  --------  --------  ------  -------------  ----  ------  -----
Total	                                   1340

Operating States

The operating state refers to the system’s capacity to respond to a situation where all active power supply modules fail. The system deems the chassis operating state as full protected, normal protected, or combined depending on these factors:

  • Total active output power, which is the total output power that is available from all the active power supply modules in the chassis.

  • Required budgeted power, which is the power the system requires only for the supervisor modules, switching modules (line cards), and fan tray to operate in the chassis.

    In the show command outputs (show power , show power detail ), this is displayed as System Power.

  • Total standby output power, which is the total output power that is available from all the power supply modules in the chassis that are configured as standby.

Whether in the n+1 or n+n mode, the system considers the chassis in a full protected state, when ALL of these conditions are met:

  • Total active output power is greater than the required budgeted power

  • Total standby output power is greater than or equal to total active output power

Whether in the n+1 or n+n mode, the system considers the chassis in a normal protected state, when ALL of these conditions are met:

  • Total active output power is greater than the required budgeted power

  • Total standby output power is lesser than the total active output power

    OR

    You are using power supply modules of different capacities - in which case the total standby output power is the power supply module with the highest capacity.

The system operates in a combined state, when it encounters these conditions (any redundancy configuration is rejected):

  • Total active output power is lesser than the required budgeted power

  • A standby power supply module is not configured or installed.

Example: Operating State

The following sample output of the show power command, shows a power supply configuration that is in a full protected state. Information about the operating state is also displayed in the show power detail command output.

Here, the power supply modules in slots 1 and 2 are active and sharing power; power supply modules in slots 7 and 8 are in standby. The required budgeted power is 2115W and inline power requires 3185W. The switch is in a full protected state because

  • Total active output power (PS1 Capacity + PS2 Capacity) is greater than the required budgeted power (System Power - Maximim Used 2115) and

  • Total standby output power (PS7 Capacity + PS8 Capacity) is equal to total active output power (PS1 Capacity + PS2 Capacity). 


Device# show power
Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W    active        good good good good
PS2          C9400-PWR-3200AC      AC   3200 W    active        good good good good
PS7          C9400-PWR-3200AC      AC   3200 W    standby       n.a. n.a. n.a. n.a.
PS8          C9400-PWR-3200AC      AC   3200 W    standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+N redundant
PS Current Operating State: Full protected

Power supplies currently active: 2
Power supplies currently available: 3
Power Summary  Maximum
(in Watts)     Used     Available
-------------  ------   --------
System Power   2115     2115
Inline Power   3185     4285 
-------------  ------   ---------
Total          5300     6400
Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Power Management Considerations

It is possible to configure a switch that requires more power than the power supplies provide.

  • The power requirements for the installed modules exceed the power provided by the power supplies.

    • If the switch has a single power supply module that is unable to meet power requirements, the following error message is displayed:

      Insufficient power supplies present for specified configuration

      The show power command output will also indicate this state of insufficient input power.

    • If the switch has more than one power supply module, and requirements for the installed modules still exceed the power provided by the power supplies, the following error message is displayed: 

      Insufficient number of power supplies (2) are installed for power redundancy mode

      The show power command output will also indicate this state of insufficient input power.

    If you attempt to insert additional modules into your switch and exceed the power supply, the switch immediately places the newly inserted module into reset mode, and the following error message is displayed: 

    Power doesn't meet minimum system power requirement.

    Additionally, if you power down a functioning chassis and insert an additional linecard or change the module configuration so that the power requirements exceed the available power, one or more linecards enter reset mode when you power on the switch again.

  • The power requirements for the PoE exceed the PoE provided by the power supplies

    If you have too many IP phones drawing power from the system, power to IP phones is cut, and some phones may be powered down to reduce the power requirements to match the power supplies.

    A module in reset mode continues to draw power as long as it is installed in the chassis; use the show power module command to determine how much power is required to bring the module online.

    To compute the power requirements for your system and verify that your system has enough power, add the power consumed by the supervisor module(s), the fan trays, and the installed linecards (including PoE). For PoE, total the requirements for all the phones.

    The 802.3at-compliant PoE modules can consume up to 60W of PoE. Be sure to add 60W to your PoE requirements for each 802.3at-compliant PoE module to ensure that the system has adequate power for the PDs connected to the switch.

    For all POE supported line cards (C9400-LC-48UX, C9400-LC-48U, C9400-LC-48P), PoE consumption is equal to the administrative PoE.

    If a powered device (PD) comsumes more power than allocated power, the following Imax error is generated; further the port is shutdown and in a faulty state: 

    
*Jun 21 10:06:06.149: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface Gi7/0/13: Power Controller reports power Imax error 
*Jun 21 10:06:06.208: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi7/0/13: PD removed
Device# show power inline 7/0/13
Gi7/0/13  auto   faulty     0.0        0.0        n/a    n/a

Selecting a Power Supply Mode

Your switch hardware configuration dictates which power supply or supplies you should use. For example, if your switch configuration requires more power than a single power supply provides, use the Cisco power calculator on cisco.com to help determine the number of power supplies that is required for either combined or redundant mode.

Configuring the Redundant Mode

By default, the power supplies in the switch are set to operate in combined mode. To effectively use redundant mode, note the following:

  • If you have the power supply mode set to redundant mode and only one power supply installed, your switch accepts the configuration but operates without redundancy.

  • Choose a power supply module that is powerful enough to support the switch configuration.

  • Use the Cisco Power Calculator to help assess the number of power supplies required by the system. Ensure that you install a sufficient number of power supply modules, so that the chassis and PoE requirements are less than the maximum available power. Power supplies automatically adjust the power resources at startup to accommodate the chassis and PoE requirements. Modules are brought up first, followed by IP phones.

  • For optimal use of system power, choose power supply modules of the same capacity when configuring a redundant mode on the switch.

To configure redundant mode, perform this task:

SUMMARY STEPS

  1. configure terminal
  2. power redundancy-mode redundant [ n+1 standby-PSslot| n+1 standby-PSslot]
  3. end
  4. show power

DETAILED STEPS

  Command or Action Purpose
Step 1

configure terminal

Example:
Device# configure terminal

Enters the global configuration mode.
Step 2

power redundancy-mode redundant [ n+1 standby-PSslot| n+1 standby-PSslot]

Example:
Device(config)# power redundancy-mode redundant n+1 5
OR
Device(config)# power redundancy-mode redundant n+n 5 6 7 8
You can choose from these options:

  • power redundancy-mode redundant n+1 standby-PSslot —Configures the n+1 redundant mode. Enter the standby power supply module slot number. The default standby slot in this redundant mode is 8.

    In the n+1 example here, the power supply module in slot PS5 (and not the default PS8) is the designated standby module and has been configured accordingly. Operational power supply modules installed in all other slots, are active.

  • power redundancy-mode redundant n+n standby-PSslot —Configures the n+n redundant mode. Enter the standby power supply module slot numbers. The default standby slots in this redundant mode are 5 through 8.

    In the n+n example here, the power supply modules in slots PS5, PS6, PS7, and PS8 are being used as standby modules, and have been configured accordingly. Operational power supply modules installed in all other slots, are active.

If you are using power supply modules of different capacities, you must also observe these guidelines:

  • For the n+1 redundant mode, configure the power supply module with the highest wattage or capacity as the standby.

  • For the n+n redundant mode – Ensure that the total standby output power is greater than or equal to the total active output power.

Step 3

end

Example:
Device(config)# end

Exits global configuration mode.
Step 4

show power

Example:
Device# show power

Displays the power redundancy mode information.

Configuring the Combined Mode

To use the combined mode effectively, follow these guidelines:

  • Choose a power supply module that provides enough power so that the chassis and PoE requirements are less than the maximum available power. Power supply modules automatically adjust the power resources at startup, to accommodate the chassis and PoE requirements.

  • If you have the power supply mode set to combined mode and only one power supply installed, your switch accepts the configuration, but power is available from only one power supply.

  • When your switch is configured to combined mode, available power is the sum of the individual power supplies

To configure combined mode on your switch, perform this task:

Before you begin

Note that this mode utilizes the available power from all the power supplies; however, your switch has no power redundancy.

SUMMARY STEPS

  1. configure terminal
  2. power redundancy-mode combined
  3. end
  4. show power

DETAILED STEPS

  Command or Action Purpose
Step 1

configure terminal

Example:
Device# configure terminal

Enters the global configuration mode.
Step 2

power redundancy-mode combined

Example:
Device(config)# power redundancy-mode combined

Sets the power supply mode to combined mode.
Step 3

end

Example:
Device(config)# end

Exits global configuration mode.
Step 4

show power

Example:
Device# show power

Displays the power redundancy mode information.

Selecting a Power Budget Mode

Configuring a power budget enables the system to reserve the power required by a supervisor module. Accordingly, you can configure to reserve power for a redundant or a non-redundant setup.

By default, the power budget mode is set to reserve power for a redundant setup, to ensure high availability. This means that the system reserves the power required by both the supervisor modules in the chassis, as part of the required budgeted power (System Power).

You can also configure the system to run in a single-sup mode to use power for other components, such as PoE or for switching modules, but for this, the second supervisor slot in the chassis must be empty (installed with a blank).

SUMMARY STEPS

  1. configure terminal
  2. [ no ] power budget mode [ single-sup ]
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters the global configuration mode.
Step 2

[ no ] power budget mode [ single-sup ]

Example:

Device(config)# power budget mode single-sup
OR
Device(config)# no power budget mode single-sup

You can choose from these options:

  • no —Enter the no version of the command to return to the default option of reserving power for both supervisor modules in the chassis.

  • single-sup —Choose this option for the system to reserve power for one supervisor module in the chassis.

Step 3

end

Example:

Device(config)# end

Exits configuration mode

Enabling Auto Line Card Shutdown

Auto line card shutdown or autoLC, is disabled by default. This feature allows you to configure line card power priority. It enables hardware to automatically shut down least priority line cards in power constraint mode until the total available active power becomes greater than or equal to the total used power displayed in the power summary of the show power command. This feature provides deterministic behavior of the switch in case of power supply failure events and prioritized line card shutdown events.

To configure autoLC shutdown and line card power priority, perform this task

SUMMARY STEPS

  1. configure terminal
  2. power supply autoLC [ priority physical-slot-number] [ shutdown ]
  3. end
  4. show power module

DETAILED STEPS

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters the global configuration mode.
Step 2

power supply autoLC [ priority physical-slot-number] [ shutdown ]

Example:

Device(config)# power supply autoLC shutdown 
OR
Device(config)# power supply autoLC priority 1 2 5 7

You can choose from these options

  • power supply autoLC [ priority physical-slot-number] —Configures line card power priority.

  • power supply autoLC [ shutdown ] —Enables automatic shutdown of line cards in case of power supply failure events.

Step 3

end

Example:

Device(config)# end

Exits global configuration mode.
Step 4

show power module

Example:

Device# show power module

Displays power redundancy mode information.

Powering Down a Line Card

If your system does not have enough power for all modules installed in the switch, you can power down one or more line cards and place them in power-off mode.

To power down a line card, perform this task:

SUMMARY STEPS

  1. configure terminal
  2. hw-module subslot card slot/subslot number shutdown unpowered
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters the global configuration mode.
Step 2

hw-module subslot card slot/subslot number shutdown unpowered

Example:

Device(config)# hw-module subslot 1/0 shutdown unpowered

Powers down the specified module by placing it in low power mode.
Step 3

end

Example:

Device(config)# end

Exits the global configuration mode

Configuration Examples for Power Supply Modes

The examples in this section illustrate different power supply setups and the possible power supply mode configurations for a given setup. Both combined and redundant power supply modes are covered.


Note

For all the examples

  • The (assumed) required budgeted power (System Power) is 2115W

  • The total active output power and total standby output power in each example will vary, to illustrate how the various modes work in different setups.

Example: Combined Mode (Power Supply Modules of the Same Capacity)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of the same capacity have been installed in slots 1 and 5.

PS1 (Active)

C9400-PWR-3200AC

PS2

PS3

PS4

PS5 (Active)

C9400-PWR-3200AC

PS6

PS7

PS8

All available power supply modules are active and sharing power and can operate at up to 100 percent capacity. The switch is in a combined operating state because a standby power supply module is not configured.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1     2    3   4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W     active        good good good good
PS5          C9400-PWR-3200AC      AC   3200 W     active        good good good good

PS Current Configuration Mode: Combined
PS Current Operating State: Combined

Power supplies currently active: 2
Power supplies currently available: 2

Power Summary   Maximum  Available
(in Watts)      Used   
-------------  ------   --------
System Power    2115     2115
Inline Power    3185     4285
-------------  ------   ---------
Total           5300     6400

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

In case of failure in the combined mode, each operational power supply increases its output. If the output power does not meet system requirements and the power supply autolc shutdown command is disabled, then all the operational power supply modules may be overloaded and go into overcurrent shutdown. All system power is then lost. We recommend enabling the power supply autolc shutdown command.

Example: Combined Mode (Power Supply Modules of Different Capacities)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of different capacities have been installed in slots 1 and 5.

PS1 (Active)

C9400-PWR-3200AC

PS2

PS3

PS4

PS5 (Active)

C9400-PWR-2100AC

PS6

PS7

PS8

All available power supply modules are active and sharing power and can operate at up to 100 percent capacity. The switch is in a combined operating state because a standby power supply module is not configured.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------   ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W     active        good good good good
PS5          C9400-PWR-2100AC      AC   2100 W     active        good good good good

PS Current Configuration Mode: Combined
PS Current Operating State: Combined

Power supplies currently active: 2
Power supplies currently available: 2
Power Summary   Maximum
(in Watts)      Used     Available
-------------   ------   --------
System Power    2115     2115
Inline Power    3185     3185 
-------------   ------   ---------
Total           5300     5300

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

In case of failure in the combined mode, each operational power supply increases its output. If the output power does not meet system requirements and the power supply autolc shutdown command is disabled, then all the operational power supply modules may be overloaded and go into overcurrent shutdown. All system power is then lost. We recommend enabling the power supply autolc shutdown command.

Example: n+1 Redundant Mode (Power Supply Modules of the Same Capacity + Normal Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of the same capacities have been installed in slots 1, 2, and 8.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-3200AC

PS3

PS4

PS5

PS6

PS7

PS8 (Standby)

C9400-PWR-3200AC

The power supply module in slot 8 is the +1 redundant power supply module. With the required budgeted power being 2115W and inline power requiring 3185W, the switch operates in a normal protected state because total standby output power is lesser than the total active output power.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W    active         good good good good
PS2          C9400-PWR-3200AC      AC   3200 W    active         good good good good
PS8          C9400-PWR-3200AC      AC   3200 W    standby        n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+1 redundant
PS Current Operating State: Normal protected

Power supplies currently active: 2
Power supplies currently available: 3

Power Summary   Maximum
(in Watts)      Used     Available
-------------  ------   --------
System Power    2115     2115
Inline Power    3185     4285 
------------- ------    ---------
Total           5300     6400

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Other valid configuration options for the n+1 mode include: PS1 or PS2 as standby.

Example: n+1 Redundant Mode (Power Supply Modules of Different Capacities + Normal Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, slots 1 and 8 have power supply modules of the same capacity; slot 2 has a power supply module of a different (lower) capacity.

This configuration complies with the requirement for this scenario: For n+1 with power supply modules of different capacities, the power supply module with the highest wattage or capacity must be configured as the standby.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-2100AC

PS3

PS4

PS5

PS6

PS7

PS8 (Standby)

C9400-PWR-3200AC

The power supply module in slot 8 is the +1 redundant power supply. With the required budgeted power being 2115W and inline power requiring 3185W, the switch is in a normal protected state because total standby output power is lesser than total active output power.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W     active        good good good good
PS2          C9400-PWR-2100AC      AC   2100 W     active        good good good good
PS8          C9400-PWR-3200AC      AC   3200 W     standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+1 redundant
PS Current Operating State: Normal protected	

Power supplies currently active: 2
Power supplies currently available: 3

Power Summary  Maximum
(in Watts)     Used      Available
------------- ------    --------
System Power   2115      2115
Inline Power   3185      3185 
------------- ------    ---------
Total          5300      5300

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Other valid configuration options for the n+1 mode include: PS1 standby (but not PS2 because of its lower capacity)

Example: n+n Redundant Mode (Power Supply Modules of the Same Capacity + Full Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of the same capacity have been installed in slots 1, 2, 7, and 8.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-3200AC

PS3

PS4

PS5

PS6

PS7 (Standby)

C9400-PWR-3200AC

PS8 (Standby)

C9400-PWR-3200AC

The power supply modules in slots 1 and 2 are active and sharing power; power supply modules in slots 7 and 8 are in standby. With the required budgeted power being 2115W and inline power requiring 3185W, the switch is in a full protected state because

  • Total active output power is greater than the required budgeted power and

  • Total standby output power is equal to total active output power.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type   Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------   ------------  -----------------------
PS1          C9400-PWR-3200AC      AC    3200 W     active        good good good good
PS2          C9400-PWR-3200AC      AC    3200 W     active        good good good good
PS7          C9400-PWR-3200AC      AC    3200 W     standby       n.a. n.a. n.a. n.a.
PS8          C9400-PWR-3200AC      AC    3200 W     standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+N redundant
PS Current Operating State: Full protected	

Power supplies currently active: 2
Power supplies currently available: 2

Power Summary   Maximum
(in Watts)      Used      Available
-------------  ------    --------
System Power    2115      2115
Inline Power    3185      4285 
-------------  ------    ---------
Total           5300      6400

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Other valid configuration options that have the same end result of n+n with full protected state: configure any two slots as standby.

Example: n+n Redundant Mode (Power Supply Modules of the Same Capacity + Normal Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of the same capacity have been installed in slots 1, 2, and 8.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-3200AC

PS3

PS4

PS5

PS6

PS7

PS8 (Standby)

C9400-PWR-3200AC

The power supply modules in slots 1 and 2 are active and sharing power; the power supply module in slot 8 is in standby.

With the required budgeted power being 2115W and inline power requiring 4200W, the switch is in a normal protected state because

  • Total active output power is greater than the required budgeted power and

  • Total standby output power is lesser than the total active output power.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type   Capacity   Status       1    2    3    4
Supply
------       -------------------- ----  --------   ------------  -----------------------
PS1          C9400-PWR-3200AC      AC    3200 W     active        good good good good
PS2          C9400-PWR-3200AC      AC    3200 W     active        good good good good
PS8          C9400-PWR-3200AC      AC    3200 W     standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+N redundant
PS Current Operating State: Normal protected

Power supplies currently active: 2
Power supplies currently available: 3

Power Summary   Maximum
(in Watts)      Used      Available
-------------  ------    --------
System Power    2115      2115
Inline Power    4200      4285 
-------------  ------    ---------
Total           6315      6400

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Other valid configuration options that have the same end result of n+n with normal protected state: configure any other slot as standby.

Example: n+n Redundant Mode (Power Supply Modules of Different Capacities + Full Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, slots 1 and 8 have power supply modules of one and the same capacity, and slots 2 and 7 have power supply modules of one and same capacity.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-2100AC

PS3

PS4

PS5

PS6

PS7 (Standby)

C9400-PWR-2100AC

PS8 (Standby)

C9400-PWR-3200AC

The power supply modules in slots 1 and 2 are active and sharing power; the power supply modules in slots 7 and 8 are in standby. With the required budgeted power being 2115W and inline power requiring 3185W, the switch is in a full protected state because

  • Total active output power is greater than the required budgeted power

  • Total standby output power is equal to total active output power


Attention

Although the setup and configuration in this example satisfy all the conditions, a full protected state is not guaranteed for these reasons: If all active power supply modules fail, the standby power supply module that switches over to active first determines if system will continue to operate safely. During the 20-millisecond minimum holdup time, if the power supply module with the lower capacity (PS7 in this example) switches over to active first, it will draw more current than its maximum capacity. This could result in Over Current Protection (OCP) for the lower capacity power supply and the system could crash partially or fully. Hence, such a setup should be treated as a normal protected state.

You may encounter a similar situation if you install power supply modules of the same capacity, but different voltages – the system cannot guarantee a full protected state.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W     active        good good good good
PS2          C9400-PWR-2100AC      AC   2100 W     active        good good good good
PS7          C9400-PWR-2100AC      AC   2100 W     standby       n.a. n.a. n.a. n.a.
PS8          C9400-PWR-3200AC      AC   3200 W     standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+N redundant
PS Current Operating State: Full protected

Power supplies currently active: 2
Power supplies currently available: 4

Power Summary   Maximum
(in Watts)      Used     Available
-------------  ------   --------
System Power    2115     2115
Inline Power    3185     3185
-------------  ------   ---------
Total           5300     5300

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Example: n+n Redundant Mode (Power Supply Modules of Different Capacities + Normal Protected State)

The table below represents the two rows of power supply slots in a Cisco Catalyst 9400 Series chassis. Power supply slots are indicated as PS1, PS2, and so on. For this example, power supply modules of the same capacity have been installed in slots 1 and 8, a power supply module of a different (lower) capacity is installed in slot 2.

PS1 (Active)

C9400-PWR-3200AC

PS2 (Active)

C9400-PWR-2100AC

PS3

PS4

PS5

PS6

PS7

PS8 (Standby)

C9400-PWR-3200AC

The power supply modules in slots 1 and 2 are active and sharing power; the power supply module in slot 8 is in standby. With the required budgeted power being 2115W and inline power requiring 3185W, the switch is in a normal protected state because

  • Total active output power is greater than the required budgeted power and

  • We are using power supply modules of different capacities where the total standby output power is the power supply module with the highest capacity.

The following is sample output of this setup (the show power privileged EXEC command): 


Device# show power

Power        Model No             Type  Capacity   Status        1    2    3    4
Supply
------       -------------------- ----  --------  ------------  -----------------------
PS1          C9400-PWR-3200AC      AC   3200 W     active        good good good good
PS2          C9400-PWR-2100AC      AC   2100 W     active        good good good good
PS8          C9400-PWR-3200AC      AC   3200 W     standby       n.a. n.a. n.a. n.a.

PS Current Configuration Mode: N+N redundant
PS Current Operating State: Full protected

Power supplies currently active: 2
Power supplies currently available: 3

Power Summary   Maximum
(in Watts)      Used     Available
-------------  ------   --------
System Power    2115     2115
Inline Power    0        3185
-------------  ------   ---------
Total           2115     5300

Automatic Linecard Shutdown: Enabled
Power Budget Mode          : Dual Sup

Other valid configuration options that have the same end result of n+n with normal protected state: PS1 as standby.

Feature History and Information for Environmental Monitoring and Power Management

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Release

Modification

Cisco IOS XE Fuji 16.8.1a

The power budget mode was introduced

Support for the 2100W AC-Input Power Supply was introduced (C9400-PWR-2100AC).

Cisco IOS XE Everest 16.6.1

This feature was introduced.