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    Posted 11-13-2019 02:28 AM
    Hello All,

    yesterday i face an issue with the juniper router in which its Routing engine malfunctioned and switched to backup RE. but there the issue is i am unable to get the trap from that router as first there is an event of    "Device LHR-GT-BNG-MX48-1-re0 of type JuniperJUNOSRtr is no longer responding to primary management requests (e.g. SNMP), but appears to be responsive to other communication protocol (e.g. ICMP)." and then after few second there was an alarm of trap storm maybe due to which the traps are discarded.

    i want to know the complete working of trap storm feature...
    our enviornment values are: 20 traps/sec and threshold limit 5s. these are default.
    kindly guide about the working and will it discard all the traps in 5 seconds and then when it will normal the traps receiving after once it get suppressed.


    [Resident Enginner ]

    Best Answer

    Posted 11-14-2019 09:18 AM
    Hi Liaquat,

    It is in the CA Spectrum guide.

    How Trap Storm Detection Works

    The SpectroSERVER can block the processing of traps that are coming from managed and unmanaged devices when a threshold is reached. Excessive traps that are coming at a high rate can take down your SpectroSERVER and Archive Manager. You can enable the trap storm detection at your SpectroSERVER or at the level of a modeled device. When devices that are modeled in CA Spectrum send more than 20 traps per second, you must adjust traps_per_sec_storm_threshold so that trap storm detection does not limit the ability to receive traps.
    You can enable the trap storm detection at any level by configuring the following two attributes. These attributes are available under the Attributes in the Component detail pane for the selected VNM model or for a selected device model:
    • traps_per_sec_storm_threshold
      Defines the rate at which traps are received per second from a managed or unmanaged device. When this rate is sustained for the amount of time that is specified by the TrapStormLength, the SpectroSERVER stops the processing of traps from that unmanaged or managed device.
      Default: 20 traps per second

    • TrapStormLength
      Defines the time in seconds for which the traps_per_sec_storm_threshold value is sustained. SpectroSERVER considers it a trap storm and disables the processing of traps from that unmanaged or managed device.
      Default: 5 seconds
    When traps received from any device reach the configured thresholds, the SpectroSERVER identifies this rate as a trap storm. The SpectroSERVER stops handling traps from that device and traps from other devices are not blocked. SpectroSERVER trap storm detection logic is based on each IP address of an unmanaged or a managed device (trap source) that sends traps to SpectroSERVER. As a result, you can configure each device to send traps to the SpectroSERVER at the appropriate rate.

    SpectroSERVER does not stop the processing of unmanaged traps when the overall trap storm rate from all the unmanaged devices exceeds the single trap storm threshold rate of an unmanaged device. As a result, you can configure each unmanaged device to send traps to the SpectroSERVER at the appropriate rate.

    Technical Support Engineer IV
    Broadcom Inc