Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.1(20)EW - Environmental Monitoring and Power Management [Cisco Catalyst 4500 Series Switches]

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 4500 Series Switches

Power Management Modes

Selecting a Power Management Mode

Power Management Limitations in Catalyst 4500 Family Switches

Available Power for Catalyst 4500 Series Switches Power Supplies

Special Considerations for the 1400 W DC 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

Configuring Power Over Ethernet

Power Management Modes

Configuring Power Consumption for Powered Devices on an Interface

Intelligent Power Management

Displaying the Operational Status for an Interface

Environmental Monitoring and Power Management

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

•Configuring Power Over Ethernet

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/ios121/121cgcr/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 34-1.

Table 34-1 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 34-2 for more information.

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

Table 34-2 Alarms for Supervisor Engine and Switching Modules

Event

Alarm Type

Supervisor LED Color¹

Description and Action

Supervisor engine 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 thresholds:

•Chassis temperature = 32°C

•Chassis over temperature threshold = 75°C

•Chassis critical temperature threshold = 95°C

Supervisor fails power on self-test (POST)

Major

Red

Syslog message.

The modules fail 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.

No problems

None

Green

¹A status LED is located on the supervisor engine front panel.

²Temperature 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 includes the following major sections:

•Power Management for the Catalyst 4500 Series Switches

•Power Management for the Catalyst 4006 Switch

•Power Consumption of Chassis Components

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 Power over Ethernet (PoE) and system power.

–1000 W AC

–2800 W AC—Supports PoE.

•Variable Wattage—This power supply 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.

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 Supply    Max     Min     Max     Min     Absolute
(Nos in Watts)  Inline  Inline  System  System  Maximum
--------------  ------  ------  ------  ------  --------
PS1             1400    1400    1360    1360    2800
PS2                0       0       0       0       0
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. The 1400W DC power supply does not support combined mode.

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.

See Table 34-4 for Catalyst 4500 series switch module power requirements.

Power Management Limitations in Catalyst 4500 Family 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 initiates the five-minute evaluation countdown timer. When this timer runs out, the system attempts to resolve this power usage limitation by evaluating the type and number of modules installed.

During the evaluation cycle, the modules are, in effect, removed and re-inserted, thus disrupting network connectivity; the switch reactivates only the modules it is able to support with the limited power available and leaves the remaining modules in reset mode. The supervisor engine always remains enabled. Modules placed in reset mode still consume some power. If the chassis module combination, including the modules in reset, still requires more power than is available, the five-minute evaluation countdown timer starts for another evaluation cycle, and additional modules enter reset mode until the power usage is stable. If the power requirement of the active modules and the modules in reset does not exceed the available power, the system is stable and no evaluation cycles run until something again causes insufficient power usage. Multiple cycles may be required to stabilize the system. 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 find out how much power is required to bring the module online and for how long it is held in reset.

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, multiply the number of IP phones by 6.3 W. See the "Power Consumption of Chassis Components" section for more information on the power consumption for the various components of your switch.

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".
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 34-3.

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 34-3 for more information.)

•The maximum available power for chassis and PoE for each power supply are listed in Table 34-3.

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 34-3 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 predetermined current sharing ratio. The total power available is P + (P * ratio).

Table 34-3 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

Chassis (max) = 1667

PoE (min) = 433

PoE (max) = 1333

Chassis + PoE + Backplane < 2166

2/3

1400 W DC

Chassis (min) = 200

Chassis (max) = 1360

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

N/A

2/3

2800 W AC

Chassis = 1360

PoE = 1400

Chassis = 2473

PoE = 2545

System—9/11

PoE—2/3

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

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

³DC 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 9.

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/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#
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 4000 series modules 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 4500 series 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 Supervisor Engine III 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 Supervisor Engine III 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 "Power Consumption of Chassis Components" 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.

Both of these scenarios initiate the five-minute evaluation countdown timer. When this timer runs out, the system attempts to resolve this power usage limitation by evaluating the type and number of modules installed. The evaluation process may require several cycles to stabilize the chassis' power usage.

During the evaluation cycle, the modules are in effect removed and re-inserted, thus causing disruption of network connectivity; the switch reactivates only the modules it is able to support with the limited power available and leaves the remaining modules in reset mode. The supervisor engine always remains enabled. Modules placed in reset mode still consume some power. If the chassis module combination, including the modules in reset, still require more power than is available, the five-minute evaluation countdown timer starts for another evaluation cycle, and additional modules are placed in reset mode until the power usage is stable.

If the power requirement of the active modules and with the modules in reset does not exceed the available power, the system is stable and no more evaluation cycles are run, until something again causes insufficient power usage. One or possibly two cycles are required to stabilize the system. If you configure the chassis correctly, the system will not enter the evaluation cycle.

Note If you have all three power supplies installed and you still choose to operate in 1+1 redundancy mode but later add additional modules which exceed the power available, the five-minute evaluation timer starts again. The switch may require several evaluation cycles to stabilize the system. To correct this power situation caused by the additional modules, you can either remove the extra modules or change the power redundancy to 2+1 redundancy mode. If you choose to return to the 2+1 redundancy mode, each module held in reset mode is brought up one-by-one to an operational state.

A module in reset continues to draw power as long as it is installed in the chassis; however, the show module command output indicates that there is not enough power for the module.

A single power supply provides 400 W or 650 W. Two 400 W power supplies provide 750 W. Two 650 W power supplies supply only 750 W, and 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 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 "Power Consumption of Chassis Components" 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:

•Supervisor Engine III —110 W

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

•Fan box—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:

•Supervisor Engine III —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 box—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:

•Supervisor Engine III —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 set 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
Power                                             Fan     Inline
Supply  Model No          Type       Status       Sensor  Status
------  ----------------  ---------  -----------  ------  ------
PS1     WS-X4008          AC 400W    good         good    n.a.
PS2     WS-X4008          AC 400W    good         good    n.a.
PS3     none              --         --           --      --
PEM     none              --         --           --      --
Power Supply    Max     Min     Max     Min     Absolute
(Nos in Watts)  Inline  Inline  System  System  Maximum
--------------  ------  ------  ------  ------  --------
PS1                0       0     400     400     400
PS2                0       0     400     400     400
PS3               --      --      --      --     --
Power Summary
 (in Watts)    Available   Used   Remaining
-------------  ---------  ------  ---------
System Power      400       260      140
Inline Power        0         0        0
Maximum Power     400       260      140
Power supplies needed by system :1
                         Power Used  Power Used
Mod   Model               (online)   (in Reset)
----  -----------------  ----------  ----------
 1    WS-X4014               110           110
 3    WS-X4306                35            30
 6    WS-X4424-GB-RJ45        90            50
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)                    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#
Power Consumption of Chassis Components

For power consumption of common Catalyst 4000 family modules, see Table 34-4.

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

Table 34-4 Power Consumption for Catalyst 4000 Family Components

Module

Power Consumed During Operation (W)

Power Consumed in Reset Mode (W)

Supervisor Engine II-Plus

110

110

Supervisor Engine III

110

110

Supervisor Engine IV

110

110

Catalyst 4006 fan box

25

25

Catalyst 4503 fan box

30

30

Catalyst 4506 and 4507 fan box

50

50

Catalyst 4006 switch backplane

0

0

Catalyst 4503 switch backplane

10

10

Catalyst 4506 switch backplane

10

10

Catalyst 4507 switch backplane

40

40

6-port 1000BASE-X (GBIC) Gigabit Ethernet
WS-X4306-GB

35

30

32-port 10/100 Fast Ethernet RJ-45
WS-X4232-RJ-XX

50

35

24-port 100BASE-FX Fast Ethernet switching module
WS-X4124-FX-MT

90

75

32-port 10/100 Fast Ethernet RJ-45, plus 2-port 1000BASE-X (GBIC) Gigabit Ethernet
WS-4232-GB-RJ

55

35

48-port 100BASE-FX Fast Ethernet switching module
WS-4148-FX-MT

120

10

18-port server switching 1000BASE-X (GBIC) Gigabit Ethernet
WS-4418-GB

80

50

Catalyst 4006 Backplane Channel Module
WS-X4019

10

10

48-port 10/100 Fast Ethernet RJ-45
WS-X4148-RJ

65

40

12-port 1000BASE-T Gigabit Ethernet, plus 2-port 1000BASE-X (GBIC) Gigabit Ethernet
WS-X4416

110

70

24-port 1000BASE-X Gigabit Ethernet
WS-X4424-GB-RJ45

90

50

48-port 1000BASE-X Gigabit Ethernet
WS-X4448-GB-RJ45

120

72

48-port 1000BASE-X Gigabit Ethernet
WS-X4448-GB-LX

90

50

48-port Telco 10/100BASE-TX switching module
WS-X4148-RJ21

65

40

48-port PoE 10/100BASE-TX switching module
WS-X4148-RJ45V

60

50

4-port MT-RJ Uplink module
WS-U4504-FX-MT

10

10

Configuring Power Over Ethernet

This section contains the following subsections:

•Power Management Modes

•Configuring Power Consumption for Powered Devices on an Interface

•Displaying the Operational Status for an Interface

The Catalyst 4006 switch and Catalyst 4500 series switches can sense if a powered device is connected to a PoE module. The Catalyst 4006 switch and Catalyst 4500 series switches can supply PoE to the powered device if there is no power on the circuit. The powered device can also be connected to an AC power source and supply its own power to the voice circuit. If there is power on the circuit, the switch does not supply it.

Note A powered device is any device connected to the switch that requires external power or can utilize PoE, for example, an access point or IP phone.

Power Management Modes

If your switch has a module capable of providing PoE to end stations, you can set each interface on the module to automatically detect and apply PoE if the end station requires power.

The Catalyst 4500 series switch has three PoE modes:

•auto—PoE interface. The supervisor engine directs the switching module to power up the interface only if the switching module discovers the phone and the switch has enough power. You can specify the maximum wattage that is allowed on the interface. If you do not specify a wattage, then the switch will deliver no more than the hardware-supported maximum value. This mode has no effect if the interface is not capable of providing PoE.

•static—High priority PoE interface. The supervisor engine preallocates power to the interface, even when nothing is connected, guaranteeing that there will be power for the interface. You can specify the maximum wattage that is allowed on the interface. If you do not specify a wattage, then the switch preallocates the hardware-supported maximum value. If the switch does not have enough power for the allocation, the command will fail. The supervisor engine directs the switching module to power up the interface only if the switching module discovers the powered device.

•never—Data interface only The supervisor engine never powers up the interface, even if an unpowered phone is connected. This mode is only needed when you want to make sure power is never applied to a PoE-capable interface.

The switch allocates PoE to the interfaces configured to static mode before it allocates power to the interfaces configured to auto mode. In the event of insufficient PoE due to a partial power supply failure, interfaces configured to auto mode are shutdown before interfaces configured to static mode.

For most users, the default configuration of "auto" works well, providing plug and play capability. No further configuration is required. However to make an interface higher priority, data only, or to specify a maximum wattage, perform this task:
Command

Purpose
Step 1
Switch(config)# interface {fastethernet | 
gigabitethernet} slot/port 
Selects the interface to configure.
Step 2
Switch(config-if)# power inline {auto [max 
milli-watts] | never | static [max 
milli-watts]}
The auto keyword sets the interface to automatically detect and supply power to the powered device. This is the default configuration.

The static keyword sets the interface to higher priority than auto.

If necessary, you can use the max keyword to specify the maximum wattage allowed on the interface (4000 to 15400 milliwatts).

Use the never keyword to disable detection and power for the PoE capable interface.
Step 3
Switch(config-if)# end 
Exits configuration mode.
Step 4
Switch# show power inline {fastethernet | 
gigabitethernet} slot/port 
Displays the PoE state for the switch.
If you set a non-PoE-capable interface to automatically detect and apply power, an error message indicates that the configuration is not valid.

The following example shows how to set the Fast Ethernet interface 4/1 to automatically detect PoE and send power through that interface:
Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface fastethernet 4/1 
Switch(config-if)# power inline auto
Switch(config-if)# end
This example shows how to verify the PoE configuration for the Fast Ethernet interface 4/1:
Switch# show power inline fastethernet 4/1
Available:677(w)  Used:11(w)  Remaining:666(w)
Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device                    
--------- ------ ---------- ---------- ---------- ------------------- -----
Fa4/1     auto   on         11.2       10.0       Ieee PD             0    
Interface  AdminPowerMax   AdminConsumption    
             (Watts)           (Watts)           
---------- --------------- --------------------  
Fa4/1                 15.4                 10.0
Switch# 
The following example shows how to configure an interface so that it never supplies power through the interface:
Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface fastethernet 5/2 
Switch(config-if)# power inline never
Switch(config-if)# end
Switch#
Configuring Power Consumption for Powered Devices on an Interface

By default, when the switch detects a powered device on an interface, it assumes the powered device consumes 7 W. Then, when the switch receives a CDP packet from the powered device, the wattage automatically adjusts downward to the specific amount required by that device. Normally, this automatic adjustment works well, and no further configuration is required or recommended. However, you can specify the powered device's consumption for the entire switch (or for a particular interface) to provide extra functionality from your switch. This is useful when CDP is disabled or not available.

Note When manually configuring the consumption for powered devices, you need to account for the power loss over the cable between the switch and the powered device.

To change the power consumption for the entire switch, perform this task:
Command

Purpose
Step 1
Switch(config)# [no] power inline consumption 
default milli-watts 
Sets the PoE consumption (in milliwatts) of all powered devices connected to the switch. The power consumption can range from 4000 to 15,400.

To re-enable the automatic adjustment of consumption, either use the no keyword or specify 15,400 milliwatts.
Step 2
Switch(config)# end 
Exits configuration mode.
Step 3
Switch# show power inline consumption default
Displays the PoE consumption of powered devices connected to the switch.
This example shows how to set the PoE consumption of the powered devices connected to the switch to 5000 milliwatts:
Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# power inline consumption default 5000
Switch(config)# end
Switch#
This example shows how to verify the PoE consumption:
Switch# show power inline consumption default
Default PD consumption : 5000 mW
Switch# 
To change the power consumption of a single powered device, perform this task:
Command

Purpose
Step 1
Switch(config)# interface {fastethernet | 
gigabitethernet} slot/port 
Selects the interface to configure.
Step 2
Switch(config-if)# [no] power inline 
consumption milli-watts 
Sets the PoE consumption (in milliwatts) of the powered device connected to the interface. The power consumption can range from 4000 to 15,400.

To re-enable the automatic adjustment of consumption, either use the no keyword or specify 15,400 milliwatts.
Step 3
Switch(config-if)# end 
Exits configuration mode.
Step 4
Switch# show power inline consumption 
{fastethernet | gigabitethernet} slot/port
Displays the PoE consumption for the interface.
This example shows how to set the PoE consumption to 5000 milliwatts for Fast Ethernet interface 4/1 regardless what is mandated by the 802.3af class of the discovered device, or by any CDP packet received from the powered device:
Switch# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)# interface fastethernet 4/1 
Switch(config-if)# power inline consumption 5000
Switch(config-if)# end
Switch#
This example shows how to verify the PoE consumption:
Switch# show power inline fastethernet 4/1
Available:677(w)  Used:11(w)  Remaining:666(w)
Interface Admin  Oper            Power(Watts)     Device              Class
              