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Troubleshooting the EX Series Redundant Power System Power On and Power Backup Issues

This topic provides troubleshooting information for problems related to the EX Series Redundant Power System (RPS).

The EX Series RPS Is Not Powering On

Problem

Description

The RPS does not power on even though it has a power supply installed and is connected to an AC power source outlet.

Environment

The RPS with one EX-PWR3-930-AC power supply installed in it is connected to a switch.

Symptoms

The SYS LED on the power supply side of the RPS is off, and when you check the RPS status using the CLI command show chassis redundant-power-system, the message No RPS connected is displayed.

Cause

A power supply must be installed in the middle slot on the RPS to power on the RPS.

Solution

Install a power supply in the middle slot on the power supply side of the RPS and verify that the AC power source outlet is properly connected to it. See Installing a Power Supply in the EX Series Redundant Power System.

Verify that the AC OK LED and the DC OK LED on the power supply in the RPS are lit green.

A Switch Is Not Recognized by the RPS

Problem

Description

I cannot set up the RPS.

Cause

A switch must be active to be recognized by the RPS.

Solution

Activate the switch by configuring it and issuing a commit statement.

An Error Message Indicates That an RPS Power Supply is Not Supported

Problem

Description

An RPS error message indicates that an RPS power supply is not supported.

Cause

RPS supports only one power supply, the EX-PWR3-930-AC. If you install another similar power supply, it may fit in the slot but it is not compatible with RPS.

Solution

The power supply shipped with your RPS (in a separate box) is an EX-PWR3-930-AC. If you installed more power supplies, you ordered them separately. Replace any other power supply model (such as the EX-PWR2-930-AC) with an EX-PWR3-930-AC model.

The EX Series Redundant Power System Is Not Providing Power Backup to a Connected Switch

Problem

Description

The RPS does not provide power backup to a connected switch.

Environment

The RPS has an EX-PWR3-930-AC power supply installed in the middle power supply slot and is connected to two switches with power loss, one connected to RPS switch connector port 1 and the other on port 2.

Symptoms

The status LED on the associated switch connector port is not blinking green–it is either solid green (connected) or not lit (off).

Cause

The RPS provides backup power based on the power priority assigned to each switch.

Solution

If the status LED on a switch connector port is off, ensure that the RPS cable is properly connected to both the RPS and the switch, and ensure that the priority configured for the switch is not 0. See show redundant-power-system status.

If the status LED on switch connector port 1 is on and is steadily green, check the backup priority configured for the switch and assign it a higher priority. See Determining and Setting Priority for Switches Connected to an EX Series RPS

If the status LED on switch connector port 1 is amber, check if the RPS has enough power supplies installed in it to provide backup power. if it does not, install a power supply in an empty power supply slot on the RPS. See Installing a Power Supply in the EX Series Redundant Power System.

If the status LED on switch connector port 1 is still off, check the priority configured for the switch. Ensure that the is not set to 0, which means off. See show redundant-power-system status. The priority assigned must be from 1 through 6. See Determining and Setting Priority for Switches Connected to an EX Series RPS.

Verify that a dedicated power supply is installed in the switch. The RPS cannot boot a switch that does not have a dedicated power supply. See Installing a Power Supply in the EX Series Redundant Power System.

Also keep in mind that when the command request redundant-power-system multi-backup has been set, support for switches that supply PoE is not guaranteed. To reverse this setting, use the command request redundant-power-system no-multi-backup.

The Wrong Switches Are Being Backed Up

Problem

Description

Four or more switches are connected to an RPS with three power supplies. When all four switches fail, the wrong three switches have .

Environment

Four or more switches are connected to an RPS with three power supplies. One or more switches provide PoE to other devices.

Symptoms

When all four switches fail, the wrong three switches have .

Cause

The RPS provides backup power based on the power priority assigned to each switch. This is derived from two configurations, one of which has precedence over the other one. Initial is derived from the location of the port used to attach a switch—the leftmost connector has lowest priority and the rightmost connector has highest priority. The second, dominant priority configuration is derived from a CLI priority setting on the switch itself. With this CLI configuration, 6 is highest priority and 1 is the lowest priority.

Solution

Connect the three switches to the three rightmost connectors on the RPS. Then, using the CLI on each switch, set each switch’s priority to 1 using the redundant-power-system configuration command redundant-power-system 1. Now, physical connection location is determining .

If you do not want to change the cabling on the switches, you can use the configuration statement redundant-power-system on all four switches, assigning priority 6 (highest), 5, 4 and 3 to the appropriate switches. Priority configuration on the switch always overcomes set by connector location.

Six Switches That Do Not Require PoE Are Not All Being Backed Up

Problem

Description

Only three switches out of six are simultaneously backed up when all switches experience power supply failure. None of these switches supply PoE power to any device.

Environment

The RPS with three EX-PWR3-930-AC power supplies installed in it is connected to six switches, none of which is connected to a non-PoE device.

Symptoms

Only three switches out of six are simultaneously backed up when all switches experience power supply failure. None of these switches supply PoE power to any device.

Cause

Each power supply can support two switches that do not need enough power for PoE, as long as you configure the RPS to do so.

Solution

From any of the attached switches, issue the request redundant-power-system multi-backup command from the operational mode. Now standard power will be supplied to two non-PoE switches per power supply.