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  • 1.  CA Spectrum AGENT LOST polling Mechanisms

    Posted Dec 10, 2018 05:59 AM

    Dear Fellows,

     

    I have a confusion regarding polling intervals in Management agent lost alarms .

    suppose spectrum polls at 5:00 AM to a device and device never responds to its snmp requests it tries 3 times after 3 seconds each. 

    My question is that after how much time interval spectrum again send snmp request to that device to get the status. will it waits for polling interval that is 5 minutes by default???.



  • 2.  Re: CA Spectrum AGENT LOST polling Mechanisms

    Broadcom Employee
    Posted Dec 10, 2018 07:19 AM

    Please take a look at this doc: Tech Tip: Spectrum Device Communication Timeout Intelligence Concepts 

     

    Let me know if any doubt remains.

     

    Thanks,

    Silvio



  • 3.  Re: CA Spectrum AGENT LOST polling Mechanisms

    Posted Dec 10, 2018 03:22 PM

    I read that document earlier I just want to confirm that after alert generation if my polling_Interval is 300s then Spectrum again polls and send snmp request again for checking the SNMP communication availability with that  device after 5 mints on next polling cycle. before next poll their is just a wait.....?



  • 4.  Re: CA Spectrum AGENT LOST polling Mechanisms

    Broadcom Employee
    Posted Dec 11, 2018 06:05 AM

    HI Akash,

     

    Suppose you have this default settings:

    • Poll Interval (sec): 300
    • DCM Timeout (ms): 3000
    • DCM Retry Count: 3

     

    CA Spectrum polls each device every 5 minutes (300 seconds).

    In each poll (SNMP get-request), CA Spectrum will wait for 3 seconds (3000 ms) for a response. If the device did not respond in 3 seconds, CA Spectrum will poll the device again, up to 3 times.

    If there is no response for SNMP get-request after 3 attempts, CA Spectrum will ping the device. If the device replies to Ping, but not to SNMP, CA Spectrum asserts the "MANAGEMENT AGENT LOST" alarm.

    Then CA Spectrum will do a SNMP get-request every 5 minutes, and it will do a Ping every 5 minutes.

    Once the device responds to the SNMP get-request, the alarm will be cleared.

     

     

    But if the device does not respond to Ping either, CA Spectrum asserts the "DEVICE HAS STOPPED RESPONDING TO POLLS" alarm.

    Then CA Spectrum will do a Ping every 60 seconds. 

     

    Poll Devices That Are Down - CA Spectrum - 10.3 - CA Technologies Documentation 

     

    Poll Devices That Are Down

    Last update August 24, 2014

    When contact with a device has been lost, CA Spectrum uses two methods to continue polling the device for a status change. First, CA Spectrum pings the device once every 60 seconds. Second, CA Spectrum sends SNMP requests every third polling interval by default. For example, if the device polling interval is set to 60 seconds, CA Spectrum polls the down device once every 180 seconds.

    To change the default interval at which CA Spectrum polls a down device, insert the following syntax into the <$SPECROOT>/SS/.vnmrcfile:

    down_device_poll_interval_multiplier=<user_defined_multiplier>

    For example, if the <user_defined_multiplier>=2 and the device polling interval is 60 seconds, then CA Spectrum polls the down device once every 120 seconds (2*60=120).

     

    If there is a network connectivity with others devices,  CA Spectrum will also polls the neighbors.

     

    Fault Isolation - CA Spectrum - 10.2 to 10.2.3 - CA Technologies Documentation 

     

    Thanks,

    Silvio