[j-nsp] Juniper M20 does not clear "show chassis alarms"/"show system alarms" although problem not present any more

[Chris Cappuccio]

remove power supply, reinsert?

martin [m4rtin86 at gmail.com] wrote:
> Hi,
> sorry about cumbersome subject, at least it's informative :) However,
> has anyone seen an issue with Juniper M20 where alarms("show chassis
> alarms", "show system alarms") do not clear althought problem itself
> is not present any more? I have a Juniper M20 router(JUNOS 9.4R4.5),
> which has two AC PSU's(740-007311) installed. There were few short
> power outages with one power feed(first one ~6min, second one ~6min
> and third one ~30min) and finally :
> 
> Jan 19 07:21:11  M20 chassisd[1130]: CHASSISD_SNMP_TRAP6: SNMP trap
> generated: Power Supply OK (jnxContentsContainerIndex 2,
> jnxContentsL1Index 2, jnxContentsL2Index 0, jnxContentsL3Index 0,
> jnxContentsDescr Power Supply B, jnxOperatingState/Temp 2)
> 
> 
> "Power Supply A" is connected to other power-feed and was not affected
> at all. As you can see, according to log, "Power Supply B" is fine.
> "DC OK" light of "Power Supply B" is on and "show chassis environment
> " output indicates as well, that "Power Supply B" is fine:
> 
> Class Item                           Status     Measurement
> Power Power Supply A                 OK
>       Power Supply B                 OK
> 
> 
> According to Juniper
> documentation(http://www.juniper.net/techpubs/software/junos/junos73/swcmdref73-basics-services/html/chassis-monitor18.html),
> "You cannot clear the alarms for chassis components. Instead, you must
> remedy the cause of the alarm. When a chassis alarm is lit, it
> indicates that you are running the router in a manner that we do not
> recommend."
> 
> However, I still see following output if I execute "show chassis
> alarms" or "show system alarms":
> 
> user at M20> show chassis alarms
> 2 alarms currently active
> Alarm time               Class  Description
> 2011-01-19 06:12:44 UTC  Major  Power Supply B not providing power
> 2011-01-19 06:13:41 UTC  Major  Power Supply B fan failed
> 
> user at M20>
> 
> 
> I know, that rebooting the router would help, but what might cause
> such issue? Has anybody encountered something similar?
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