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CGS2520 consol connection triggers false alarms

Answered Question
Oct 20th, 2011
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Everytime the console port is plugged in, the alarm contacts (1-4) randomly assert (trigger) and then clear themselves in random orders. Nothing is plugged into the ALARM port and all Alarm setting are default. Below is the syslog message and Alarm Settings:



CGS2520-C#show env all
SYSTEM TEMPERATURE is OK
System Temperature Value: 45 Degree Celsius
POWER SUPPLY 1A TEMPERATURE is OK
POWER SUPPLY 1B TEMPERATURE is Disabled
POWER SUPPLY 1A Temperature Value: 49 Degree Celsius
POWER SUPPLY 1A Critical Temperature Thresh: 110 Degree Celsius
POWER SUPPLY 1A Over Temperature Thresh: 95 Degree Celsius
POWER SUPPLY 1B Temperature Value: 38 Degree Celsius
SW  PID                 Serial#     Status           Sys Pwr  PoE Pwr  Watts
--  ------------------  ----------  ---------------  -------  -------  -----
1A  PWR-RGD-AC-DC       DTM144000QM OK              Good     Good     40/65
1B  UNKNOWN             unknown     No Input Power  Bad      N/A      -40/0

ALARM CONTACT 1 is not asserted
ALARM CONTACT 2 is not asserted
ALARM CONTACT 3 is not asserted
ALARM CONTACT 4 is not asserted


...

ALARM CONTACT 1 is asserted

ALARM CONTACT 2 is asserted

ALARM CONTACT 3 is not asserted

ALARM CONTACT 4 is asserted

CGS2520-C#show env all

...

L_ALARM_CONTACT_ASSERT: Alarm asserted: external alarm contact 1

*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser

ted: external alarm contact 2

*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser

ted: external alarm contact 3

*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser

ted: external alarm contact 4

*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare

d: external alarm contact 1

*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare

d: external alarm contact 2

*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare

d: external alarm contact 3

*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare

d: external alarm contact 4

ALARM CONTACT 1 is asserted
ALARM CONTACT 2 is asserted
ALARM CONTACT 3 is not asserted
ALARM CONTACT 4 is asserted


CGS2520-C#sho logg

L_ALARM_CONTACT_ASSERT: Alarm asserted: external alarm contact 1
*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser
ted: external alarm contact 2
*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser
ted: external alarm contact 3
*Mar  2 07:21:14.690: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_ASSERT: Alarm asser
ted: external alarm contact 4
*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare
d: external alarm contact 1
*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare
d: external alarm contact 2
*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare
d: external alarm contact 3
*Mar  2 07:21:15.696: %PLATFORM_ENV-1-EXTERNAL_ALARM_CONTACT_CLEAR: Alarm cleare
d: external alarm contact 4

Correct Answer by kalin.trifonov about 5 years 5 days ago

Hello again.

With the help of my local Cisco engineer we found out that the problem is occuring when the device is NOT Grounded.

Try grounding the device and see if that helps.

It solved the same problem with my CGSs.


Cheers,

Kalin

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Overall Rating: 5 (1 ratings)
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kalin.trifonov Tue, 08/14/2012 - 02:15
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I have exactly the same problem, but with CGS2520. I do not have it with CGR2010 with ESW module.

Anyone with a solution / workaround?


When I log into the switch with telnet and unplug the console cable all alarm triggers stop and everyting is fine.


The IOS version is:

cgs2520-ipservicesk9-mz.122-58.EY2.bin


Please help.


Thanks

Kalin

Correct Answer
kalin.trifonov Tue, 08/14/2012 - 04:01
User Badges:

Hello again.

With the help of my local Cisco engineer we found out that the problem is occuring when the device is NOT Grounded.

Try grounding the device and see if that helps.

It solved the same problem with my CGSs.


Cheers,

Kalin

Adam Rhodes Tue, 08/14/2012 - 05:17
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My apologies from the first post. I did mean the CGS2520. The CGR2010 does NOT have an alarm port. The grounding solution does seem valid as the alarms went away after properly racking the CGS.


Thank you for your work Kalin!


Adam

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