Indicators are like gestures of switches, helping us maintain switches. Today, let me elaborate on indicators on modular switches.
Indicators of a modular switch are located on the panel of each module, and can be red, yellow, or green.
Generally, red indicates that a fault has occurred or a major alarm has been generated, which requires immediate actions. Yellow indicates that a minor alarm has been generated or the component is in the critical state. In this case, you need to eliminate risks instantly. Green indicates that the component is working normally.
The word "card" mentioned below may refer to main processing unit (MPU), cluster switching system (CSS) service unit, line processing unit (LPU), switch fabric unit (SFU), or value-added service card.
1 Indicator Turns Red
1.1 A Card's RUN/ALM Indicator Turns Red
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RUN/ALM Steady Red |
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Meaning and Reaction |
The card is faulty and manual intervention is required. |
1.2 A Power Module's Indicator Turns Red
The FAULT indicators on 2200 W DC, 800 W AC, 3000 W AC, and 2200 W AC power modules of the S7700 and S9700 turn red in the same situation. The indicator of a 2200 W AC power module is used as an example here.
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FAULT Steady Red |
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Meaning and Reaction |
The power module is experiencing an unrecoverable failure. See power module fault location in the Huawei S Series Campus Switches Maintenance Guide. |
The ALARM indicators on 2200 W DC, 3000 W AC, and 2200 W AC power modules of the S12700 turn red in the same situation. The indicator of a 2200 W AC power module is used as an example here.
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ALARM Steady Red |
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Meaning and Reaction |
The power module is experiencing overtemperature, external short circuit, output overvoltage, output overcurrent, or a fan failure. See power module fault location in the Huawei S Series Campus Switches Maintenance Guide. |
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ALARM Blinking Red |
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Meaning and Reaction |
The power module fails to communicate with the CMU. Troubleshooting methods: 1. Check whether the MPU and CMU are both present in the chassis, and run the display device command to check whether the CMU is working normally. 2. Contact Huawei technical support. |
The ALM indicator on the 1600 W DC power module of the S7700 turns red.
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ALM Steady Red |
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Meaning and Reaction |
The protection circuit fails. See power module fault location in the Huawei S Series Campus Switches Maintenance Guide. |
1.3 A CMU's RUN/ALM Indicator Turns Red
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RUN/ALM Steady Red |
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Meaning and Reaction |
The card is faulty and manual intervention is required. |
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RUN/ALM Fast Blinking Red |
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Meaning and Reaction |
The available power of the switch is sufficient or a 1600 W DC power module is installed in the switch. |
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RUN/ALM Slow Blinking Red |
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Meaning and Reaction |
The switch is in alarm state (for example, a CMU, fan module, or power module has failed). |
1.4 A Fan Module's RUN/ALM Indicator Turns Red
The RUN/ALM indicators on fan modules of the S7700, S9700, and S12700 turn red in the same situation. A fan module of the S12700 is used as an example here.
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RUN/ALM Steady Red |
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Meaning and Reaction |
The fan module has a hardware fault and must be replaced. |
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RUN/ALM Blinking Red |
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Meaning and Reaction |
An alarm has been generated. You need to check the fan module to determine whether to replace it. |
2 Indicator Turns Yellow or Green
2.1 A Power Module's ALM Indicator Turns Yellow
The ALM indicators on 2200 W DC, 800 W AC, 3000 W AC, and 2200 W AC power modules of the S7700 and S9700 turn yellow in the same situation. The indicator of a 2200 W AC power module is used as an example here.
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ALM Steady Yellow |
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Meaning and Reaction |
The power module has stopped supplying power due to overtemperature, input overvoltage, input undervoltage, or output overcurrent. See power module fault location in the Huawei S Series Campus Switches Maintenance Guide. |
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ALM Blinking Yellow |
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Meaning |
Communication between the power module and the monitoring module (MPU or CMU) is interrupted. |
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Reaction |
1. Check whether the MPU and CMU are both present in the chassis, and run the display device command to check whether the CMU is working normally. 2. Contact Huawei technical support. |
2.2 A Card's RUN/ALM Indicator Turns Yellow or Green
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RUN/ALM Steady Yellow |
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Meaning and Reaction |
The card is in power-off state. For example, the card has been forcibly powered off using the power off command or is starting. |
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RUN/ALM Steady Green |
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Meaning |
The card has been powered on but the system software is not running. |
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RUN/ALM Slow Blinking Green |
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Meaning |
The system software of the card is running normally. |
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RUN/ALM Fast Blinking Green |
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Meaning |
The system software of the card is starting. |
2.3 A Service Port Indicator Turns Yellow or Green
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Optical Port Indicator Turns Yellow or Green |
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Meaning |
The green one is the LINK indicator. If it is steady green, the port has been correctly connected. The yellow one is the ACT indicator. If it is blinking fast, the port is transmitting or receiving data. In the figure, the LINK and ACT indicators with down arrowheads indicate the status of port 37, while those with the up arrowheads indicate the status of port 38. |
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Electrical Port Indicator Turns Yellow or Green |
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Meaning |
If the LINK/ACT indicator is steady on, the port has been correctly connected. If the indicator is blinking fast, the port is transmitting or receiving data. In the figure, the indicator on the left indicates the status of port 36, while the one on the right indicates the status of port 37. |
3 Indicator Is Off
You do not need to pay attention to off indicators in most cases. The situations that require attention on off indicators are described here.
3.1 A Power Module's Indicator Is Off (S12700)
Indicators on 2200 W DC, 2200 W AC, and 2200 W AC power modules of the S12700 turn off in the same situation. When the INPUT indicator is off, the power module has no power input. You need to check the power input line and external power source. When the OUTPUT indicator is off, the power module provides no power output. You need to check whether the power switch of the power module is in the ON position.
4 Determining Cluster Information by Indicators
You can observe indicators on MPUs and CSS cards in member switches of a cluster to determine the active/standby MPUs of the cluster and CSS IDs of the member switches.
4.1 Cluster Established Using Service Ports
Only the S7700 and S9700 support service port clustering. If a cluster is established using service ports of member switches, you can observe ACT indicators of MPUs to determine the active and standby MPUs of the cluster.
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ACT Steady Green |
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Meaning |
The card is the active MPU of the cluster. |
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ACT Slow Blinking Green |
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Meaning |
The card is the hot standby MPU of the cluster. |
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ACT Off |
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Meaning |
The card is the cold standby MPU of the cluster. |
4.2 Cluster Established Using CSS Cards
The CSS ID of a member switch can be determined by the CSS ID indicators on its MPUs.
The active MPU of the cluster can be determined by the CSS MASTER indicator on the MPU.
The master switch of the cluster can be determined by the MASTER indicators on CSS cards.
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MPU's CSS ID Indicator Steady Green |
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Meaning |
There are eight CSS ID indicators on the panel, but only one is on at a time. If the CSS ID indicator of number N is steady green, the CSS ID of the local switch is N. In this example, the CSS ID is 2. |
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MPU's CSS MASTER Indicator Steady Green |
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Meaning |
The card is the active MPU of the cluster. |
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CSS Card's MASTER Indicator Steady Green |
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Meaning |
The local switch is the master switch of the cluster. |
5 Determining Active/Standby State of a Card by the ACT Indicator
The S7700, S9700, and S12700 support redundancy of MPUs and CMUs. The methods for identifying the active/standby state of an MPU and CMU are the same. CMU is used as an example here.
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ACT Steady Green |
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Meaning |
The card is the active card of the switch. |
