Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.2(25)EW
Environmental Monitoring and Power Management
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Environmental Monitoring and Power Management

Table Of Contents

Environmental Monitoring and Power Management

Understanding Environmental Monitoring

Using CLI Commands to Monitor your Environment

System Alarms

Power Management

Power Management for the Catalyst 4948 Switches

Power Management Modes

Power Management for the Catalyst 4500 Series Switches

Power Management Modes

Selecting a Power Management Mode

Power Management Limitations in Catalyst 4500 Series Switches

Available Power for Catalyst 4500 Series Switches Power Supplies

Special Considerations for the 1400 W DC Power Supply

Special Considerations for the 1400 W DC SP Triple Input Power Supply

Power Management for the Catalyst 4006 Switch

Limitations of the 1+1 Redundancy Mode

Setting the Power Redundancy Mode

Power Consumption of Chassis Components

Powering Down a Module


Environmental Monitoring and Power Management



Note Before reading this chapter, read the "Preparing for Installation" section of the
Catalyst 4500 Series Installation Guide. It is important to ensure that your installation site has enough power and cooling to accommodate the additional electrical load and heat introduced by PoE.


This chapter describes power management and environmental monitoring features in the Catalyst 4500 series switches. It provides guidelines, procedures, and configuration examples.

This chapter consists of the following major sections:

Understanding Environmental Monitoring

Power Management


Note For complete syntax and usage information for the switch commands used in this chapter, refer to the Catalyst 4500 Series Switch Cisco IOS Command Reference and related publications at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/index.htm.


Understanding Environmental Monitoring

This section contains the following subsections:

Using CLI Commands to Monitor your Environment

System Alarms

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

Use the show environment CLI command to monitor the system. This section gives a basic overview of the command and keywords you will need.

Enter the show environment [alarm | status | temperature] command to display system status information. Keyword descriptions are listed in Table 7-1.

Table 7-1 show environment Keyword Descriptions  

Keyword
Purpose

alarm

Displays environmental alarms for the system.

status

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

temperature

Displays temperature of the chassis.


The following example shows how to display the environment conditions. This output indicates that the power supplies are different. The switch will use only one power supply and disable the other.

Switch# show environment
no alarm 

Chassis Temperature                    = 35 degrees Celsius
Chassis Over Temperature Threshold     = 75 degrees Celsius
Chassis Critical Temperature Threshold = 95 degrees Celsius

Power                                             Fan     Inline
Supply  Model No          Type       Status       Sensor  Status
------  ----------------  ---------  -----------  ------  ------
PS1     PWR-C45-2800AC    AC 2800W   good         good    good  
PS2     PWR-C45-1000AC    AC 1000W   err-disable  good    n.a.  

*** Power Supplies of different types have been detected***
Switch#

System Alarms

The 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 turn critical if corrective action is not taken.

When the system issues an alarm (major or minor) that indicates an over-temperature condition, the switch does not cancel the alarm nor take any action (such as module reset or shutdown) for five minutes. If the temperature falls 5 degrees Celsius below the alarm threshold during this period, the alarm is canceled.

An LED on the supervisor indicates if an alarm has been issued. See Table 7-2 for more information.


Note Refer to the Catalyst 4500 Series Switch Module Installation Guide for information on LEDs, including the startup behavior of the supervisor engine system LED.


Table 7-2 Alarms for Supervisor Engine and Switching Modules 

Event
Alarm Type
Supervisor LED Color
Description and Action

Supervisor engine1 temperature sensor exceeds major threshold2

Major

Red

Syslog message.

If the over-temperature condition is not corrected, the system shuts down after 5 min.

Alarm threshold:

Chassis critical temperature threshold = 95°C

Supervisor fails power on self-test (POST)

Major

Red

Syslog message.

The supervisor fails to come up.

Chassis fan tray fails

Major

Red

If not corrected, the system shuts down in 5 minutes.

Supervisor engine temperature sensor exceeds minor threshold

Minor

Orange

Syslog message.

Monitor the condition.

Alarm threshold:

Chassis over temperature threshold = 75°C

No problems

None

Green

 

1 The Supervisor is not a distinct module on the Catalyst 4948 switch as it is on Catalyst 4500 series switches. See the Catalyst 4948 Installation Guide for LED behavior on the Catalyst 4948 switch.

2 Temperature sensors monitor key supervisor engine components, including daughter cards.


Power Management

This section describes the power management feature in the Catalyst 4500 series switches and the Catalyst 4006 switch, and it includes the following major sections:

Power Management for the Catalyst 4948 Switches

Power Management for the Catalyst 4500 Series Switches

Power Management for the Catalyst 4006 Switch

Power Consumption of Chassis Components

Powering Down a Module

Power Management for the Catalyst 4948 Switches

You can select from AC or DC power supplies to ensure that you have enough power for your switch. The Catalyst 4948 switches support the following power supplies:

300 W AC

300 W DC

These power supplies are incompatible with Catalyst 4500 series switches. Since Power over Ethernet (PoE) is not supported on the Catalyst 4948 switch, only a limited wattage is needed. (For information on PoE, see "Configuring Power over Ethernet.") When you insert power supplies in your switch, the EEPROM on the power supplies can be read by the system software even if the supply is not powered on. You may mix AC and DC power supplies.

Power Management Modes

The Catalyst 4948 switches support the redundant power management mode. In this mode, if both power supplies are operating normally, each provides from 20/80 to 45/55 percent of the total system power requirements at all times. If one power supply fails, the other unit increases power to 100 percent of the total power requirement.

Power Management for the Catalyst 4500 Series Switches

You can select from several different power supplies to ensure that you have enough power for the modules installed in your switch. The Catalyst 4500 series switches support the following power supplies:

Fixed Wattage—This power supply always delivers a fixed amount of PoE and system power.

1000 W AC (not recommended on the Catalyst 4510R switch, PoE not supported)

1400 W AC—Data-only and does not support PoE

Variable Wattage—These power supplies automatically adjusts the wattage to accommodate PoE and system power requirements.

1300 W AC—Supports PoE.

1400 W DC—Supports up to 1400 W of system power and variable amounts of PoE, depending on the input feed to the power supply. See "Special Considerations for the 1400 W DC Power Supply" section for more information.

1400 W DC Service Provider—Uses up to three lines (12.5 A, 15 A, 15 A) of DC input and delivers varying amounts of power in the range 400 W-1400 W depending on the lines powered. See "Special Considerations for the 1400 W DC SP Triple Input Power Supply" section for more information.

2800 W AC—Supports up to 1400 W of system power and up to 1400 W of PoE.


Note All Catalyst 4500 series switch AC-input power supplies require single-phase source AC. The source AC can be out of phase between multiple power supplies or multiple AC-power plugs on the same power supply because all AC power supply inputs are isolated. Each chassis power supply should have its own dedicated branch circuit: 20A for North America and circuits sized to local and national codes for International locations.


When you insert power supplies in your switch, use power supplies that are of the same wattage. If you mix power supplies, the switch will use the one it recognizes first and ignore the other power supply. The power supply status displays as err-disable and the summary displays as all zeros (0) for wattage values in the output for the show power command.

The following example shows the output for the show power command for mixed power supplies:

Switch# show power
Power                                             Fan     Inline
Supply  Model No          Type       Status       Sensor  Status
------  ----------------  ---------  -----------  ------  ------
PS1     PWR-C45-2800AC    AC 2800W   good         good    good  
PS2     PWR-C45-1000AC    AC 1000W   err-disable  good    n.a.  

*** Power Supplies of different type have been detected***

Power supplies needed by system    :1
Power supplies currently available :1

Power Summary                      Maximum
 (in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)        328         1360
Inline Power (-50V)         0         1400
Backplane Power (3.3V)     10           40
----------------------   ----
Total Used                338 (not to exceed Total Maximum Available = 750)
Switch#

Power Management Modes

The Catalyst 4500 series switches support two power management modes:

Redundant mode—Redundant mode uses one power supply as a primary power supply and the second power supply as a back-up. If the primary power supply fails, the second power supply immediately supports the switch without any disruption in the network. Both power supplies must be the same wattage. A single power supply must have enough power to support the switch configuration.

Combined mode—Combined mode uses the power from all installed power supplies to support the switch configuration power requirements. However, combined mode has no power redundancy. If a power supply fails, one or more modules might shut down.


Note On the Catalyst 4510R switch, the 1000 W AC power supply is not enough to support redundant mode for all possible configurations. It is able to support redundant mode for limited configurations that require less than 1000 W.



Note The 1400 W DC power supply supports combined mode for data power. It does not support combined mode for PoE power.


Selecting a Power Management Mode

By default, a switch is set to redundant mode. In the show power command, if the power supplies needed by system is 1, the switch is in redundant mode; if the power supplies needed by system is 2, the switch is in combined mode.

Your switch hardware configuration will dictate 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 combined mode. In combined mode, however, the switch has no power redundancy. Consider the following possibilities:

The supervisor engine consumes 110 W, the fan boxes for the Catalyst 4503 switch consume 30 W each, the fan boxes for the Catalyst 4506 and Catalyst 4507 switches consume 50 W each, the backplane for the Catalyst 4503 and Catalyst 4506 switches consumes 10 W, and the backplane for the Catalyst 4507 switch consumes 40 W.

1000 W can support a fully loaded Catalyst 4503 switch with no powered device support.

1300 W can support a fully loaded Catalyst 4503 switch with Cisco powered devices.

Each PoE port on a WS-X4148-RJ45V module requires 6.3 W. Five fully loaded WS-X4148-RJ45V modules in a switch comprise 240 ports. This configuration requires 1512 W of PoE, plus 300 W for the modules.

Power Management Limitations in Catalyst 4500 Series Switches

It is possible to configure a switch that requires more power than the power supplies provide. The two ways you could configure a switch to exceed the power capabilities are as follows:

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

If you insert a single power supply and then set the switch to combined mode, the switch displays this error message:

Insufficient power supplies present for specified configuration. 

This error message also displays in the output for the show power command. This error message displays because, by definition, combined mode requires that two working power supplies be installed in your switch.

If the power requirements for the installed modules exceeds the power provided by the power supplies, the switch displays this error message:

Insufficient power available for the current chassis configuration. 

This error message also appears in the show power command output.

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 switch displays these error messages:

Module has been inserted 
Insufficient power supplies operating.

Additionally, if you power down a functioning switch and insert an additional module or change the module configuration so that the power requirements exceed the available power, one or more modules 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.

In the first scenario (power requirements exceed the power supplied), the system attempts to resolve this power usage limitation by evaluating the type and number of modules installed. During the evaluation cycle, beginning from the bottom of the chassis, the system puts the modules that it is unable to support (for lack of power) into reset mode. The supervisor engine and modules for which there is adequate power always remain enabled, with no disruption of network connectivity. Modules placed in reset mode still consume some power and can be removed from the chassis to further reduce power requirements. If you configure the chassis correctly, the system will not enter the evaluation cycle.

A module in reset mode continues to draw power as long as it is installed in the chassis; you can 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 engine module(s), the fan box(es), and the installed modules (including PoE). For PoE, total the requirements for all the phones. See the "Powering Down a Module" section for more information on the power consumption for the various components of your switch.

The 802.3af-compliant PoE modules can consume up to 20 W of PoE to power FPGAs and other hardware components on the module. Be sure to add at least 20 W to your PoE requirements for each 802.3af-compliant PoE module to ensure that the system has adequate power for the PDs connected to the switch.

On the WS-X4148-RJ45V PoE module, PoE consumption cannot be measured. Therefore, for all PoE calculations, the PoE consumption on this module is presumed to be equal to its administrative PoE.

You can use the show module command to verify which modules are active and which, if any, have been placed in reset.

The following example shows the show module command output for a system with inadequate power for all installed modules. The system does not have enough power for Module 5; the "Status" displays it as "PwrDeny."

If the PoE that is consumed by the module is more than 50 W above the PoE you allocated using the power inline consumption default command, the "Status" displays as "PwrOver." If the PoE consumed by the module is more than 50 W above the PoE module limit, the "Status" displays as "PwrFault."

Switch# show module
Mod  Ports Card Type                              Model             Serial No.
----+-----+--------------------------------------+-----------------+-----------
 1      2  1000BaseX (GBIC) Supervisor(active)    WS-X4014          JAB054109GH
 2      6  1000BaseX (GBIC)                       WS-X4306          00000110
 3     18  1000BaseX (GBIC)                       WS-X4418          JAB025104WK
 5      0  Not enough power for module            WS-X4148-FX-MT    00000000000
 6     48  10/100BaseTX (RJ45)                    WS-X4148          JAB023402RP

 M MAC addresses                    Hw  Fw           Sw               Status
--+--------------------------------+---+------------+----------------+---------
 1 005c.9d1a.f9d0 to 005c.9d1a.f9df 0.5 12.1(11br)EW 12.1(20020313:00 Ok
 2 0010.7bab.9920 to 0010.7bab.9925 0.2                               Ok
 3 0050.7356.2b36 to 0050.7356.2b47 1.0                               Ok
 5 0001.64fe.a930 to 0001.64fe.a95f 0.0                               PwrDeny
 6 0050.0f10.28b0 to 0050.0f10.28df 1.0                               Ok
Switch#

Configuring Redundant Mode on a Catalyst 4500 Series Switch

By default, the power supplies in a Catalyst 4500 series switch are set to operate in redundant mode. To effectively use redundant mode, follow these guidelines:

Use two power supplies of the same type.

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


Caution If you have power supplies with different types or different wattages installed in your switch, the switch will not recognize one of the power supplies and will not have power redundancy.

For fixed power supplies, choose a power supply that by itself is powerful enough to support the switch configuration.

For variable power supplies, choose a power supply that provides enough power so that the chassis and PoE requirements are less than the maximum available power. Variable 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.

The maximum available power for chassis and PoE for each power supply are listed in Table 7-3.

To configure redundant mode on your Catalyst 4500 series switch, perform this task:

 
Command
Purpose

Step 1 

Switch# configure terminal

Enters configuration mode.

Step 2 

Switch(config)# power redundancy-mode redundant

Sets the power management mode to redundant mode.

Step 3 

Switch(config)# end 

Exits configuration mode.

Step 4 

Switch# show power supplies

Verifies the power redundancy mode for the switch.


Note The power redundancy-mode redundant command is not supported on a Catalyst 4006 switch.


The following example shows how to set the power management mode to redundant mode.

Switch (config)# power redundancy-mode redundant
Switch (config)# end
Switch#

The following example shows how to display the current power redundancy mode. The power supplies needed by system: 1 indicates that the switch is in redundant mode.

Switch# show power supplies
Power supplies needed by system :1
Switch#

Configuring Combined Mode on a Catalyst 4500 Series Switch

If your switch configuration requires more power than a single power supply can provide, set the power management mode to combined mode. Combined mode utilizes the available power for both power supplies; however, your switch will have no power redundancy.

To effectively use combined mode, follow these guidelines:

Use power supplies of the same type and wattage (fixed or variable and AC or DC).

If you use power supplies with different types or wattages, the switch will utilize only one of the power supplies.

For variable power supplies, choose a power supply that provides enough power so that the chassis and PoE requirements are less than the maximum available power. Variable power supplies automatically adjust the power resources at startup to accommodate the chassis and PoE requirements.

The 1400 W DC power supply does not support combined mode. If you set the power budget to 2, the switch disregards this setting.

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

When your switch is configured to combined mode, the total available power is not the mathematical sum of the individual power supplies. The power supplies have a predetermined current sharing ratio (See Table 7-3 for more information.)

The maximum available power for chassis and PoE for each power supply are listed in Table 7-3.

To configure combined mode on your Catalyst 4500 series switch, perform this task:

 
Command
Purpose

Step 1 

Switch# configure terminal

Enters configuration mode.

Step 2 

Switch(config)# power redundancy-mode combined

Sets the power management mode to combined mode.

Step 3 

Switch(config)# end 

Exits configuration mode.

Step 4 

Switch# show power supplies

Verifies the power redundancy mode for the switch.


Note The power redundancy-mode combined command does not work on a Catalyst 4006 switch.


The following example shows how to set the power management mode to combined mode.

Switch (config)# power redundancy-mode combined
Switch (config)# end
Switch#

The following example shows how to display the current power redundancy mode. The power supplies needed by system: 2 indicates that the switch is in combined mode.

Switch# show power supplies
Power supplies needed by system :2
Switch#

Available Power for Catalyst 4500 Series Switches Power Supplies

Table 7-3 lists the power available for use in the various Catalyst 4500 series switches power supplies. When your switch is configured to combined mode, the total available power in not the mathematical sum of the individual power supplies. The power supplies have a sharing ratio predetermined by the hardware. In combined mode, the total power available is P + (P * sharing-ratio), where P is the amount of power in the power supply.

Table 7-3 Available Power for Switch Power Supplies 

Power Supply
Redundant Mode (W)
Combined Mode (W)
Sharing Ratio

1000 W AC

Chassis1 = 1000

PoE = 0

Chassis = 1667

PoE = 0

2/3

1300 W AC

Chassis (max) = 1000

PoE (max) = 800

Chassis + PoE + Backplane < 1300

Chassis (min) = 767

PoE (max) = 1333

Chassis (max) = 1667

PoE (min) = 533

Chassis + PoE + Backplane <  2200

2/3

1400 W DC

Chassis (min) = 200

Chassis (max) = 1360

PoE (max)2 = (DC Input3 - [Chassis (min) + Backplane] / 0.75) * 0.96

Chassis = 22674

PoE5

Chassis—2/3

PoE—0

1400 W AC

Chassis = 1360

PoE = 06

Chassis = 2473

PoE = 0

9/11

2800 W AC

Chassis = 1360

PoE = 1400

Chassis = 2473

PoE = 2333

Chassis7 —9/11

PoE8 —2/3

1 Chassis power includes power for the supervisor(s), all line cards, and the fan tray.

2 The efficiency for the 1400 W DC power supply is 0.75, and 0.96 is applied to PoE.

3 DC input can vary for the 1400 W DC power supply and is configurable. For more information, see "Special Considerations for the 1400 W DC Power Supply" on page 10.

4 Not available for PoE.

5 Not available for PoE.

6 No voice power.

7 Data-only.

8 Inline power.


Special Considerations for the 1400 W DC Power Supply


Caution Do not mix the 1400 W DC power supply with any other power supply, even for a hot swap or other short-term emergency. Doing so can seriously damage your switch.

Keep in mind the following guidelines when using a 1400 W DC power supply with your Catalyst 4500 series switch:

The 1400 W DC power supply works with a variety of DC sources. The DC input can vary from 300 W to 7500 W. Refer to the power supply documentation for additional information.

The supervisor engine cannot detect the DC source plugged into the 1400 W DC power supply. If you are using the 1400 W DC power supply, use the power dc input command to set the DC input power. For more information on this command, see the "Configuring the DC Input for a Power Supply" section.

The software automatically adjusts between system power (for modules, backplane, and fans) and PoE. Although PoE is 96 percent efficient, system power has only 75 percent efficiency. For example, each 120 W of system power requires 160 W from the DC input. This requirement is reflected in the "Power Used" column of the output for the show power available command.

The 1400 W DC power supply does not support combined mode. If you set the power budget to 2 (combined mode), the switch allows you to configure combined modes but disregards the setting and remains in redundant mode.

The 1400 W DC power supply has a separate power on or off switch for PoE. The power supply fan status and main power supply status are tied together. If either of them fails, both the power supply and its fan report as bad/off. You should verify that the main power is on before turning on the power for the inline switch. In addition, you should verify that the power for the inline switch is off before turning off the main power.

Configuring the DC Input for a Power Supply

To configure the DC input power for the 1400 W DC power supply or a power shelf, perform this task:

 
Command
Purpose

Step 1 

Switch# configure terminal

Enters configuration mode

Step 2 

Switch(config)# power dc input watts

Sets the capacity of the DC input source.

Step 3 

Switch(config)# end 

Exits configuration mode.

The same configuration is applied to both power slots. For example, if you set the dc power input to
1000 W, the switch expects 1000 W as the external DC source for both slot 1and slot 2 (if present) respectively.

The following example shows how to set the external DC power source to 1000 W:

Switch# configure terminal
Switch (config)# power dc input 1000
Switch (config)# end
Switch#

If you use the 1400 W DC SP power supply in combined mode, the inputs do not have to match.

Special Considerations for the 1400 W DC SP Triple Input Power Supply

Unlike the 1400 W DC power supply, the 1400 W DC SP power supply has sub-modules (multiple inputs) that can be powered on or off. With Release 12.2(25)EW, the output of the show power command is modified to display the status of these sub-modules:

Switch# show power
Power                                             Fan      Inline
Supply  Model No          Type       Status       Sensor   Status
------  ----------------  ---------  -----------  -------  -------
PS1     PWR-C45-1400DC    DCSP1400W  good         good     n.a.
PS1-1                     12.5A      good
PS1-2                     15.0A      bad
PS1-3                     15.0A      off

PS2     none              --         --           --       --

Keep in mind the following guidelines when using a 1400 W DC SP power supply with your Catalyst 4500 series switch:

When you use two 48 V power rails to drive two power supplies, you might employ cross-wiring to connect the power supplies (to rails) to minimize the "inrush" current drawn during an initial power up. In this situation, you should configure the switch in combined mode before you take a rail down for maintenance.

Ordinarily, when configured for redundancy, two power supplies must be "matched" ( have identical inputs). For example, you might provide power to inputs 1 and 3 on both PS1 and PS2. If power supplies are mismatched upon bootup, the right (second) power supply will be in err-disable state.

Power Management for the Catalyst 4006 Switch

The power management feature for the Catalyst 4006 switch is designed to support an optimized Catalyst 4006 chassis with a limited module configuration on a reduced number of power supplies.

The Catalyst 4006 chassis supports only the 400 W AC, 400 W DC, and 650 W DC power supplies and allows you to mix AC-input and DC-input power supplies in the same chassis. In systems with redundant power supplies, both power supplies should be of the same wattage. If you mix a 400 W power supply and a 650 W power supply, the switch performs as if there were two 400 W power supplies. For detailed information on supported power supply configurations for each chassis, refer to the Catalyst 4000 Series Installation Guide.

Each Catalyst 4500 series module has different power requirements; thus, some switch configurations require more power than 1+1 redundancy mode (a single power supply) can provide. In those configurations, redundancy requires three power supplies. Redundant and nonredundant power configurations are discussed in later sections of this chapter.

The Catalyst 4006 switch contains holding bays for up to three power supplies. You need two primary power supplies to operate a fully loaded Catalyst 4006 chassis. You can set the power redundancy to two primary plus one redundant power supply (2+1 redundancy mode) or to one primary plus one redundant power supply (1+1 redundancy mode). The 1+1 redundancy mode might not support a fully loaded chassis.

If your switch has only two power supplies and is in 2+1 redundancy mode (the default mode), there is no redundancy. You can create redundancy with only two power supplies by setting the power redundancy to operate in 1+1 redundancy mode (one primary plus one redundant power supply). However, 1+1 redundancy will not support all configurations.

The 1+1 redundancy mode is designed and optimized for the following hardware configurations:

One Catalyst 4006 chassis with a WS-X4014 supervisor engine with two 400 W power supplies (in 1+1 redundancy mode) and four WS-X4148-RJ or WS-X4148-RJ21 modules

One Catalyst 4006 chassis with a WS-X4014 supervisor engine with two 650 W power supplies (in 1+1 redundancy mode) and five WS-X4148-RJ or WS-X4148-RJ21 modules

Although other configurations are possible, we do not recommend that you use them without careful consideration of the power usage in the system. For example, other similar and possible configurations may consist of four modules that consume less power, and the total module power usage does not exceed the absolute maximum power usage for the system.

The supervisor engine uses 110 W, the fan box uses 25 W, and the backplane does not consume any power. The system total load for the modules + supervisor + fan cannot total more than the power supplied by the power supply. The 1+1 redundancy mode might not support a fully loaded chassis and, therefore, one slot of the chassis might be empty. An attempt to use five modules risks an oversubscription of available power.

If you opt to use the 1+1 redundancy mode, the type and number of modules supported are limited by the power available from a single power supply. To determine the power consumption for each module in your chassis, see the "Powering Down a Module" section.

To choose a 1+1 redundancy configuration, you must change the system configuration from the default 2+1 redundancy mode to 1+1 redundancy mode by using the power supplies required 1 command. The power supplies required 1 command sets the power redundancy to 1+1 redundancy mode. In the 1+1 redundancy mode, the nonredundant power available to the system is the power of the single weakest power supply. The second power supply installed in your switch provides full redundancy.

Limitations of the 1+1 Redundancy Mode

If you attempt to configure the system to operate in 1+1 redundancy mode, and you have more modules installed in the chassis than a single power supply can handle, the system displays the following error message:

Insufficient power supplies for the specified configuration

This message will also appear in the show power command output.

If you are already operating in 1+1 redundancy mode with a valid module configuration and you attempt to insert additional modules that require more power than the single power supply provides, the system immediately places the newly inserted module into reset mode and issues these error messages:

Module has been inserted 
Insufficient power supplies operating 

Additionally, if a chassis that has been operating in 1+1 redundancy mode with a valid module configuration is powered down, and you insert a module or change the module configuration inappropriately and power on the switch again, the module(s) in the chassis (at boot up) that require more power than is available, are placed into reset mode.

A module in reset mode continues to draw power as long as it is installed in the chassis and as long as the show module command output indicates that there is not enough power for the module to be brought out of reset mode.

A single power supply provides 400 W or 650 W. Two 400 W power supplies provide 725 W. Two 650 W power supplies supply only 750 W. The 750 W limit is a restriction on the power supply cooling capacity for the Catalyst 4006 switches.

If you mix a 400 W power supply and a 650 W power supply, the switch performs as if there were two 400 W power supplies. If you have one 400 W power supply and one 650 W power supply in 1+1 redundancy mode, and a second 650 W power supply is set as the backup, the system performs as if there were 400 W. If the 400 W power supply fails, the backup 650 W power supply comes into service; however, the switch still has only 400 W available. You need to remove the failed 400 W power supply for the switch to make use of the 650 W available.

To compute the power requirements for your system and verify that your system has enough power, add up the power consumed by the supervisor engine module, the fan box, and the installed modules. (See the "Powering Down a Module" section for more information on the power consumption for the various components of your switch.) For 1+1 redundancy mode, verify that the total is less than 400 W or 650 W, depending on the power supplies installed in your switch. The following examples are provided to further explain the use of power supplies.

The following configuration requires a minimum of 395 W:

WS-X4014 supervisor engine—110 W

Four WS-X4148-RJ modules—65 W each (260 W total—the optimized module configuration)

Fan tray—25 W

This configuration requires less than the maximum that a single power supply can provide in 1+1 redundancy mode.

The following configuration requires more power than a single 400 W power supply can provide:

WS-X4014 supervisor engine—110 W

Two WS-X4148-RJ modules in slots 2 and 3—65 W each (130 W total)

Two WS-X4448-GB-LX modules in slots 4 and 5—90 W each (180 W total)

Fan tray—25 W

This configuration requires 445 W and cannot be used in 1+1 redundancy mode for a 400 W power supply. A single 650 W power supply provides enough power for 1+1 redundancy mode for this configuration.

The following configuration requires more power than either a single 400 W or 650 W power supply can provide:

WS-X4014 supervisor engine—110 W

Five 48-port 100BASE-FX modules in slots 2 through 6—120 W each (600 W total)

Fan box—25 W

This configuration requires 735 W and cannot be used in 1+1 redundancy mode for either a 400 W or 650 W power supply.

Remember, when considering the 1+1 redundancy mode, you must carefully plan the configuration of the module power usage of your chassis. An incorrect configuration will momentarily disrupt your system during the evaluation cycle. To avoid this disruption, carefully plan your configuration to ensure that it is within the power limits, or return to the default 2+1 redundancy configuration by installing a third power supply in your switch and setting the power redundancy to 2+1 redundancy mode.

Use the power supplies required 2 command to set the power redundancy to the 2+1 redundancy mode.

Setting the Power Redundancy Mode

To configure the power redundancy mode on a Catalyst 4006 switch, perform this task:

 
Command
Purpose

Step 1 

Switch# configure terminal

Enters configuration mode.

Step 2 

Switch(config)# power supplies required {1 | 2}

Sets the power redundancy mode.

Step 3 

Switch(config)# end 

Exits configuration mode.

Step 4 

Switch# show power

Verifies the power redundancy mode and the current power usage for the switch.


Note The power supplies required command is not supported on a Catalyst 4500 series switch.


The default power redundancy mode is 2 (2+1) redundancy mode.

The following example shows how to set the power redundancy mode to 1 (1+1 redundancy mode).

Switch (config)# power supplies required 1
Switch (config)# end
Switch#

The following example shows how to display the current power status of system components and the power redundancy mode. The Power supplies needed by system: 1 indicates that the switch is in 1+1 redundancy mode:

Switch# show power supplies
Power supplies needed by system :1
Switch#

The following example shows the show module command output for a system with inadequate power for all installed modules. The system does not have enough power for Module 5; the "Status" displays it as "PwrDeny."

Switch# show module

Mod  Ports Card Type                              Model             Serial No.
----+-----+--------------------------------------+-----------------+-----------
 1      2  1000BaseX (GBIC) Supervisor(active)    WS-X4014          JAB054109GH
 2      6  1000BaseX (GBIC)                       WS-X4306          00000110
 3     18  1000BaseX (GBIC)                       WS-X4418          JAB025104WK
 5      0  Not enough power for module            WS-X4148-FX-MT    00000000000
 6     48  10/100BaseTX (RJ45)V, Cisco/IEEE       WS-X4248-RJ45V    JAB074804LE 

 M MAC addresses                    Hw  Fw           Sw               Status
--+--------------------------------+---+------------+----------------+---------
 1 005c.9d1a.f9d0 to 005c.9d1a.f9df 0.5 12.1(11br)EW 12.1(20020313:00 Ok
 2 0010.7bab.9920 to 0010.7bab.9925 0.2                               Ok
 3 0050.7356.2b36 to 0050.7356.2b47 1.0                               Ok
 5 0001.64fe.a930 to 0001.64fe.a95f 0.0                               PwrDeny
 6 000d.edc6.dac0 to 000d.edc6.daef 2.0                               Ok
Switch#

Power Consumption of Chassis Components

For power consumption of all Catalyst 4000/4500 family modules, see Appendix A, Specifications, in the Catalyst 4500 Series Module Installation Guide.

Enter the show power command to display the current power redundancy and the current system power usage.

Powering Down a Module

If your system does not have enough power for all modules installed in the switch, you can power down a module, and place it in reset mode. To power down a module, perform this task:

Command
Purpose

Switch(config)# no hw-module module num power

Turns power down to the specified module by placing it in reset mode.


To power on a module that has been powered down, perform this task:

Command
Purpose

Switch(config)# hw-module module num power

Turns power on to the specified module.


This example shows how to power down module 6:

Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# no hw-module module 6 power

Switch(config)# end
Switch#