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Cisco Bug: CSCvi10249 - Alarm card led message BLW_MIN__PM_ALRM is lost upon switchover

Last Modified

Jul 25, 2019

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.CE

Description (partial)

Symptom:
+ CRS has a number of operational power modules which is less then the configured/default (5 operational; 6 configured):

RP/0/RP0/CPU0:router#admin show env powe config

Rack 0: Power Shelf A:

Power Modules Information
-------------------------

MAX number of PMs : 08
MIN number of PMs (Configured): NOT CONFIGURED
MIN number of PMs (Default) : 06 <<<< 6 is the minimum.


Rack 0: Power Shelf B:

Power Modules Information
-------------------------

MAX number of PMs : 08
MIN number of PMs (Configured): NOT CONFIGURED
MIN number of PMs (Default) : 06



RP/0/RP0/CPU0:router#admin show env powe
Rack 0:

Power-Supply Output Voltage(V) Output Current(A)
DC-PEM

A0 54.973 8.690 <<< there are only 5 PMs operational on each cage
A1 54.895 8.553
A2 54.738 8.485
A3 54.973 8.416
A4 54.895 9.032
A5 -- --
A6 -- --
A7 -- --

Total Current (A): 43.176 (Output)
Total Power (W): 2364.529 (Output)

Power-Supply Output Voltage(V) Output Current(A)
DC-PEM

B0 54.817 8.758
B1 54.817 8.758
B2 54.895 8.621
B3 54.817 8.690
B4 54.738 9.237
B5 -- --
B6 -- --
B7 -- --

Total Current (A): 44.064 (Output)
Total Power (W): 2416.528 (Output)

+ This means that the system alarms with the following flag and syslog:

SP/0/AM1/SP:Feb 19 00:18:04 : envmon[117]: %PLATFORM-ENVMON-4-ALARM : MAJOR alarm - Shelf is running with less than minimum number of power supplies  alarm generated by Power Shelf B 

RP/0/RP0/CPU0:router#admin show led
LOCATION MESSAGE MODE STATUS
==================================================
0/AM0/* BLW_MIN__PM_ALRM DEFAULT UNLOCKED
0/AM1/* BLW_MIN__PM_ALRM DEFAULT UNLOCKED

+ If a switchover is performed the flag BLW_MIN__PM_ALRM is cleared even though the operational PEM is still less then the configured minimum # of PEMs.

RP/0/RP0/CPU0:router#admin show led
LOCATION MESSAGE MODE STATUS
==================================================
0/AM0/* RACK0 IOS XR DEFAULT UNLOCKED
0/AM1/* RACK0 IOS XR DEFAULT UNLOCKED

Conditions:
+ Supervisor switchover.
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