2013-JUNIPER典型CASE案例--CN2-电源模块告警

JUNIPER典型CASE案例--电源模块告警

1. 问题描述

电源是路由器至关重要的模块部分，尽管电源模块故障率很低，同时也具有冗余功能，但重视级别同样不能忽视。当一块PEM出现硬件故障后，Juniper路由器仍然会继续稳定工作，这是因为电源模块的冗余使其在任何一块电源故障的情况下仍然可以继续稳定的运行。使用show system alarms 可以查看当前是否电源告警。

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{master}

wangyan@GZ-BJ-XDL-A-1.CN2-RE0> show chassis environment pem PEM 0 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 20 percent Voltage:

48.0 V input 52565 mV 48.0 V fan supply 48751 mV 8.0 V bias 8473 mV 5.0 V bias 4976 mV PEM 1 status:

State Present Voltage: PEM 2 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 20 percent Voltage:

48.0 V input 53209 mV 48.0 V fan supply 50320 mV 8.0 V bias 8515 mV 5.0 V bias 4984 mV PEM 3 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 40 percent Voltage:

48.0 V input 53229 mV 48.0 V fan supply 50793 mV 8.0 V bias 8527 mV 5.0 V bias 4996 mV

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2. 分析过程

此故障原因为电源模块出现硬件故障后，导致机框管理进程获取电源信息不正常.从而发出告警。使用show chassis alarms可以发现PEM

1 Not OK 告警, 电源模块重启失败后停留在

check状态, Syslog日志里

面出现相应报错信息:

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wangyan@GZ-BJ-XDL-A-1.CN2-RE0> show system alarms 1 alarms currently active

Alarm time Class Description 2012-08-26 06:13:05 CST Major PEM 1 Not OK

---------------------------------------------------------------------------- {master}

wangyan@GZ-BJ-XDL-A-1.CN2-RE0> show chassis environment | except \Class Item Status Measurement Temp PEM 0 OK PEM 1 Check PEM 2 OK PEM 3 OK

Routing Engine 0 OK 34 degrees C / 93 degrees F Routing Engine 1 OK 34 degrees C / 93 degrees F

CB 0 OK 37 degrees C / 98 degrees F CB 1 OK 35 degrees C / 95 degrees F SIB 0 OK 39 degrees C / 102 degrees F SIB 1 OK 39 degrees C / 102 degrees F SIB 2 OK 39 degrees C / 102 degrees F SIB 3 OK 40 degrees C / 104 degrees F FPC 0 Intake OK 29 degrees C / 84 degrees F FPC 0 Exhaust OK 43 degrees C / 109 degrees F FPC 2 Intake OK 35 degrees C / 95 degrees F FPC 2 Exhaust OK 41 degrees C / 105 degrees F FPC 7 Intake OK 29 degrees C / 84 degrees F FPC 7 Exhaust OK 39 degrees C / 102 degrees F FPM GBUS OK 29 degrees C / 84 degrees F Misc CIP OK ---------------------------------------------------------------------------- router> show log messages

Aug 26 12:13:20.458 2012 GZ-BJ-XDL-A-1.CN2-RE0 chassisd[4537]:

úEMON-5-CHASSISD_SNMP_TRAP6: SNMP trap generated: Power Supply failed

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3.处理过程

注意：此处操作需在电气工程师的指导下完成，非专业人员请勿执行下列操作 1. 关闭电源：

通过手动关闭电源，将电源开关调整到off上。按照下图指示，将电源上的供电线路旋钮取下。

2. 现场拔插板卡

将板卡拔出，待10分钟时间后，将其恢复原位置，螺丝旋扭锁紧。检查无误之后，将电源开关打开。

3. 通过命令启动(online)板卡, 并确认状态, (如果板卡不能启动请直接跳至后续建议部分.)

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{master}

wangyan@GZ-BJ-XDL-A-1.CN2-RE0> show chassis environment pem PEM 0 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 20 percent Voltage:

48.0 V input 52565 mV 48.0 V fan supply 48751 mV 8.0 V bias 8473 mV 5.0 V bias 4976 mV PEM 1 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 20 percent Voltage:

48.0 V input 52565 mV 48.0 V fan supply 48751 mV 8.0 V bias 8473 mV 5.0 V bias 4976 mV PEM 2 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 20 percent Voltage:

48.0 V input 53209 mV 48.0 V fan supply 50320 mV 8.0 V bias 8515 mV 5.0 V bias 4984 mV PEM 3 status:

State Online

Temperature OK DC Input: OK DC Output: OK

Load Less than 40 percent Voltage:

48.0 V input 53229 mV 48.0 V fan supply 50793 mV 8.0 V bias 8527 mV 5.0 V bias 4996 mV

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4. 查看告警是否已经消失

-------------------------------------------------------------------------------------------------- {master}

wangxg@GD-GZ-TT-I-2.CN2-RE0> show chassis alarms

No alarms currently active

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4.后续建议

如果以上方法不能解决问题，请联系JTAC或代理商，进一步确实是否需更换硬.

全部过程请在电气相关工程师陪同下完成。

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