Contents

Introduction

Prerequisites

Requirements

Components Used

Physical Troubleshooting

Common Verification Commands

Catalyst 9300

Verification Commands

Special Considerations

Catalyst 9500

Verification Commands

Catalyst 9400 and 9600

Power Supplies Configuration Modes

Combined Mode

Redundant Mode N+1

Redundant Mode N+N

Verification Commands

Special Considerations

ROMMON Variable SINGLE_SUP_CHASSIS

Power Budget Mode Dual Sup

Software Defects

Related Information

Introduction

This document describes common methods to troubleshoot power supplies on Catalyst 9000 Series Switches.

Prerequisites

Requirements

Cisco recommends that you have knowledge of these topics:

- Catalyst 9000 Series Switches architecture

Components Used

The information in this document is based on these software and hardware versions:

- C9300

- C9500

- C9400

- C9600

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Physical Troubleshooting

1. Verify what color on the PS LED is displayed (green/amber/red/off).

LED status

Signification

Off

No AC power is present in any power supplies.

Green

This power supply operates properly in main power mode.

Solid Amber

Indicates one of these:

- No output power available

- AC/DC input is under the range of operation

- Over voltage/over current/over temperature conditions

- Over-temperature protection (OTP) due to fan failure

Blinking Amber

Indicates warning events such as a power supply module that continues to operate in high temperature or high power and a fan that runs slow and so on.

Red

Power supply failure.

Note: Consult specific hardware installation guide for each platform, meaning of LED color can vary from platform to platform.

2. If LED color is other than green, try the next tests:

Test

Steps

Reset the power supply

- Remove the PS from it slot.

- Wait a couple of minutes.

- Re-insert the PS to its slot.

Reset the power cord

- Remove the power cord from the affected PS.

- Wait a couple of minutes.

- Re-insert the power cord back to the PS.

Swap components

- Try to use a well-known working power cord.

- Try to use a well-Known working power outlet.

- Try a spare power supply on the same slot.

- Try the same faulty PS in a well-known working slot.

- Try the same faulty PS in a different switch.

Note: If applicable, ensure there are no cable ties or any other object that can block the PS fan.

Common Verification Commands

Command

How to Use

Switch#show inventory

Verify power supply is detected in the inventory.

Switch#show post

Verify all the tests are in passed status.

Switch#show log

Look for any error message related with with the issue.

Catalyst 9300

Verification Commands

Use show environment power privilege EXEC command to verify PS status and budget.

Switch#show env power

SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts

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

2A  PWR-C1-1100WAC      <snip>       OK              Good     Good     1100

2B  Not Present

Use show power inline privilege EXEC command to verify power budget available for PoE  is properly allocated based on the power supplies installed.

Switch#show power inline

Module   Available     Used     Remaining

(Watts)     (Watts)    (Watts)

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

2           595.0        0.0       595.0

Use show stack-power detailprivilege EXEC command (applies only to devices configured as stack power) to verify stack power mode, power allocation, stack power ports status and so on.

Switch#show stack-power detail

Power Stack                      Stack   Stack    Total   Rsvd    Alloc   Sw_Avail Num  Num

Name                             Mode    Topolgy  Pwr(W)  Pwr(W)  Pwr(W)   Pwr(W)  SW   PS

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

power-stack-1                    SP-PS   Ring     6600    30      1695    4875      3    6

power-stack-1-1                  SP-PS   Ring     4400    30      1193    3177      2    4

Power stack name: power-stack-1

Stack mode: Power sharing

Stack topology: Ring

Switch 4:

Power budget: 2043

Power allocated: 434

Low port priority value: 22

High port priority value: 13

Switch priority value: 4

Port 1 status: Connected

Port 2 status: Shut

Neighbor on port 1: Switch 3 - <snip>

Neighbor on port 2: 0000.0000.0000

Switch 2:

Power budget: 2375

Power allocated: 919

Low port priority value: 21

High port priority value: 12

Switch priority value: 3

Port 1 status: Shut

Port 2 status: Connected

Neighbor on port 1: 0000.0000.0000

Neighbor on port 2: Switch 3 - <snip>

Switch 3:

Power budget: 2043

Power allocated: 342

Low port priority value: 23

High port priority value: 14

Switch priority value: 5

Port 1 status: Connected

Port 2 status: Connected

Neighbor on port 1: Switch 2 - <snip>

Neighbor on port 2: Switch 4 - <snip>

Power stack name: power-stack-1-1

Stack mode: Power sharing

Stack topology: Ring

Switch 5:

Power budget: 1964

Power allocated: 342

Low port priority value: 24

High port priority value: 15

Switch priority value: 6

Port 1 status: Not connected

Port 2 status: Connected

Neighbor on port 1: 0000.0000.0000

Neighbor on port 2: Switch 1 - <snip>

Switch 1:

Power budget: 2375

Power allocated: 851

Low port priority value: 20

High port priority value: 11

Switch priority value: 2

Port 1 status: Connected

Port 2 status: Not connected

Neighbor on port 1: Switch 5 - <snip>

Neighbor on port 2: 0000.0000.0000

Special Considerations

- Consult hardware installation guide for PoE budget available on each model. Some models have low PoE budget, such as C9300-48UXM that has a PoE budget of 490 W with 1100 WAC power supply, this can be misinterpreted as hardware failure.

- It has been seen in some scenarios where a second power supply is inserted, but PoE budget remains as budget from one single PS. When a switch does not detect PoE budget for a second PS and power supplies are detected on Good status, you can try to perform a full power cycle as workaround.

Remove the power cords from both PS to turn off the switch, then:

1. Remove PS1.

2. Remove PS2.

3. Wait couple minutes.

4. Re-insert PS1.

5. Re-insert PS2.

6. Connect power cord to PS1.

7. Connect power cord to PS2.

Note: In case of a stack, all members affected need to be power cycled.

Catalyst 9500

Verification Commands

Use show power detail privilege EXEC command to verify power supply status. You can also use this command to check power supply capacity and model.

Switch#show power detail

Switch:1

Power                                                    Fan States

Supply  Model No              Type  Capacity  Status     0     1

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

PS0     C9K-PWR-650WAC-R      AC    650 W     ok         good  N/A

PS1     Not Present           N/A   N/A       N/A        N/A   N/A

Fan                 Fan States

Tray    Status      0     1     2     3

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

FM0     ok          good  good  good  good

FM1     ok          good  good  good  good

Switch:2

<snip>

Use show platform hardware chassis power-supply detail switch [switch number] all privilege EXEC command to verify input and output values are under proper ranges. (This command also works for C9600 platform.)

Switch#show platform hardware chassis power-supply detail switch 1 all

PS1:

Input Voltage   :     200.0000 V

Output Voltage  :      12.0480 V

Input Current   :       0.6800 A

Output Current  :       9.7500 A

Input Power     :     131.0000 W

Output Power    :     118.0000 W

Temperature 1   :      23.0000 C

Temperature 2   :      29.0000 C

Temperature 3   :      28.0000 C

Fan Speed 1     :   10176.0000 RPM

PS2:

<snip>

Note: Consult data sheet for power supply specifications.

Catalyst 9400 and 9600

Power Supplies Configuration Modes

Combined Mode

This is the default power supply mode. All available power supplies are active, share power, and can operate at up to 100 percent capacity. Available power in the combined mode is the sum of the individual power supplies.

If there is other power supply mode configured, you can use power redundancy-mode combinedcommand to return to default mode:

Switch(config)#power redundancy-mode switch 1 combined

Redundant Mode N+1

For this mode, n number of power supply modules are active (n can be one to seven power supply modules), and +1 is the power supply module reserved for redundancy.

The default standby power supply slot is PS8. Specify a standby slot with the power redundancy-mode redundant n+1 [standby-PS-slot] command.

In the next example, power supply inserted in slot 5 is configured as standby:

Switch(config)#power redundancy-mode switch 1 redundant N+1 5

Redundant Mode N+N

For this 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 with the power redundancy-mode redundant n+n [standby-PS-slots] command.

In the next example, power supplies inserted in slots 2, 3, and 4 are configured as standby:

Switch(config)#power redundancy-mode switch 1 redundant N+N 2 3 4

Verification Commands

Use show environment statusprivilege EXEC command to verify power supply status, PS Current Configuration Mode and PS Current Operating State.

Switch#show environment status

Switch:1

Power                                                       Fan States

Supply  Model No              Type  Capacity  Status        1     2

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

PS1     C9400-PWR-3200AC      ac    3200 W    active        good  good

PS2     C9400-PWR-3200AC      ac    3200 W    active        good  good

PS Current Configuration Mode : Combined

PS Current Operating State    : Combined

Power supplies currently active    : 2

Power supplies currently available : 2

<snip>

Switch 1:

Fantray : good

Power consumed by Fantray : 540 Watts

Fantray airflow direction : side-to-side

Fantray beacon LED: off

Fantray status LED: green

SYSTEM : GREEN

With show power detailprivilege EXEC command, you can also verify the amount of power consumed or reserved for each line card, supervisor, and even for the Fan Tray. Additionally, you can verify the power budget mode, it can be either Single Sup or Dual Sup.

Switch#show power detail

Switch:1

Power                                                       Fan States

Supply  Model No              Type  Capacity  Status        1     2

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

PS1     C9400-PWR-3200AC      ac    3200 W    active        good  good

PS2     C9400-PWR-3200AC      ac    3200 W    active        good  good

PS Current Configuration Mode : Combined

PS Current Operating State    : Combined

Power supplies currently active    : 2

Power supplies currently available : 2

Switch:2

<snip>

Switch:1

Power Summary          Maximum

(in Watts)    Used    Available

-------------  ------  ---------

System Power   1670    1670

Inline Power   0       4730

-------------  ------  ---------

Total          1670    6400

Switch:2

<snip>

Switch:1

Automatic Linecard Shutdown : Enabled

Power Budget Mode           : Dual Sup

autoLC    Power                                  Out of  In

Mod  Model No              Priority  State     Budget  Instantaneous  Peak  Reset   Reset

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

1    C9400-LC-24XS         0         accepted  200     94             96    200     10

2    C9400-LC-48U          1         accepted  65      32             33    65      5

3    C9400-SUP-1XL         0         accepted  400     239            252   400     130

4    C9400-SUP-1XL         0         ---       400     239            252   0       130

5    C9400-LC-48H          2         accepted  65      31             32    65      5

--   Fan Tray              0         accepted  540     --             --    540     --

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

Total   1670

Note: When power budget mode is Dual Sup, it automatically reserves power for a second supervisor even when there is no second supervisor installed.

Special Considerations

ROMMON Variable SINGLE_SUP_CHASSIS

By default, the system reserves power for both supervisors to ensure high availability. Some C9600 can be configured with ROMMON variable SINGLE_SUP_CHASSIS=”0” or SINGLE_SUP_CHASSIS=”1”. When this variable is set to 0 it indicates the power budget mode is for Dual Sup, when it is set to 1 it indicates power budget mode is Single Sup.

You can verify if this variable is configured with show romvar  privilege EXEC command.

Switch#show romvar | in SUP

MODEL_NUM="C9600-SUP-1"

SINGLE_SUP_CHASSIS="0"

When ROMMON variable SINGLE_SUP_CHASSIS is set to 1, it is not reflected in command show power detail, but, it can still show power budget mode as Dual Sup, however, the reserved power for a second supervisor reflects 0.

Power Budget Mode           : Dual Sup

Power                                  Out of  In

Mod  Model No              State     Budget  Instantaneous  Peak  Reset   Reset

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

1    C9600-LC-48YL         accepted  230     0              0     230     10

2    C9600-LC-24C          accepted  200     0              0     200     10

3    C9600-SUP-1           accepted  775     0              0     775     202

4    C9600-SUP-1           ---       0       --             --    0       0

FM1  C9606-FAN             accepted  450     --             --    450     --

Although the ROMMON variable indicates single sup mode, when a second supervisor is inserted, that supervisor consumes the proper power budget if there is enough power available. If you need the switch to reserve power for a second supervisor even when there is no second supervisor installed, you can set ROMMON variable SINGLE_SUP_CHASSISto 0, for this you need to enter to ROMMON mode.

Note: If you want to install a second supervisor, always remember to have the proper number of power supplies installed.

Power Budget Mode Dual Sup

When there is only one supervisor installed and there are not enough power supplies installed, the default power budget mode can trigger a scenario where the line cards are prevented to receive power and show power deny status.

Mod  Model No              State     Budget  Instantaneous  Peak  Reset   Reset

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

1    C9600-LC-48YL         denied    10      0              0     230     10

2    C9600-LC-24C          denied    10      0              0     200     10

3    C9600-SUP-1           accepted  775     0              0     775     202

4    C9600-SUP-1           ---       775     --             --    775     0

FM1  C9606-FAN             accepted  450     --             --    450     --

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

Total allocated power:  2020

Total required power:   2430

In order to solve this, you can configure the power budget mode for Single Sup. This power budget mode allows the switch to use the reserved power for the second supervisor to enable the line cards.

Switch(config)#power budget mode single-sup

If you need to install a second supervisor in some point, remember to configure the switch back to Dual Sup and to install the proper number of power supplies needed to meet the power requirements.

Switch(config)#no power budget mode single-sup

Warning: If you do not configure the switch back to power budget mode Dual Sup, and you do not install the proper number of PS, this can trigger a low power condition where the system can shut down.

Tip: Cisco Power Calculator is an educational resource that can help you as a starting point to plan you power requirements.

Software Defects

- Cisco bug ID CSCwc87761 - C9300L PWR-C1-350WAC-P power supply can turn off requiring power cable OIR

- Cisco bug ID CSCvk48435 - Faulty PS on Cat9500 series switches PWR-C4-950WAC-R=

- Cisco bug ID CSCvx30283 - CAT 9400 | 16.9.x and 16.12.x | LiteON PSU in standby slot goes to faulty state after some time

- Cisco bug ID CSCvz62847 - CAT 9400 | 17.3.x | LiteON PSU in standby slot goes to faulty state after some time

Note: Only registered Cisco users can access internal bug information and tools.

Related Information

- Cisco Power Calculator

- Cisco Catalyst 9600 Series Switches Hardware Installation Guide

- Cisco Catalyst 9300 Series Switches Hardware Installation Guide, Product Overview

- Cisco Catalyst 9500 Series Switches Data Sheet

- Cisco Technical Support & Downloads