Fault Isolation Settings

The Fault Isolation subview in the VNM model’s Information tab lets you configure various aspects of the sp device fault isolation functionality. It contains the following settings:
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The Fault Isolation subview in the VNM model’s Information tab lets you configure various aspects of the
CA Spectrum
device fault isolation functionality. It contains the following settings:
  • ICMP Support Enabled
    Specifies whether an attempt should be made to contact a device using the ICMP protocol when trying to ascertain the fault status of the device. When the ICMP_SUPPORT attribute is enabled (set to TRUE),
    CA Spectrum
    looks at the setting of the ICMP_SUPPORT attribute at the device level. If ICMP support is also enabled on the device,
    CA Spectrum
    attempts to contact the device using the ICMP protocol. However, when ICMP_SUPPORT is disabled (set to FALSE), this setting takes precedence over the setting at the device level and prevents any attempt to contact the device using the ICMP protocol for fault isolation.
    Default:
    Yes
  • ICMP Timeout (msec)
    Specifies the amount of time (in milliseconds)
    CA Spectrum
    waits for a response to an ICMP ping. If a response is not received within this period of time,
    CA Spectrum
    assumes the device has timed out.
    Default:
    3000 milliseconds (3 seconds)
  • ICMP Try Count
    Specifies the total number of attempts made to contact a device using the ICMP protocol before
    CA Spectrum
    determines the device is down.
  • Lost Device Try Count
    Specifies the number of retries that
    CA Spectrum
    attempts for each SNMP request sent to a device after contact with the device is lost.
    Default:
    1
  • Port Fault Correlation
    Enables port fault correlation and specifies how it should be configured.
    Default:
    All Connected Ports
  • Contact Lost Model Destruction
    Specifies whether a device is automatically destroyed when its CONTACT_STATUS is set to false. When enabled, models that have had their CONTACT_STATUS set to lost for a specified period of time, as determined by the Destruction Delay (sec) setting, are destroyed automatically. When disabled, models will never be automatically destroyed as a result of the value of the CONTACT_STATUS attribute.
    Default:
    Disabled
  • Destruction Delay (sec)
    Specifies the length of time (in seconds) that a model must continuously have its CONTACT_STATUS attribute set to lost before it is automatically destroyed.
    Default:
    604800 seconds (7 days)
  • Destruction Event Generation
    This field controls whether an event message is created when a model is automatically destroyed. When this field is set to Enabled, an event will be generated each time a model is destroyed as a result of its CONTACT_STATUS being continuously set to lost for the length of time specified in the Destruction Delay Time field. When this field is set to Disabled, no event message will be generated.
    Default:
    Enabled
  • Router Redundancy Retry Count
    Specifies the number of times
    CA Spectrum
    will attempt to contact a router’s redundant IP addresses if contact is lost with its primary address. The polling interval setting determines the amount of time between each attempt.
    Default:
    2
  • Unresolved Fault Alarm Disposition
    If information about the connectivity of your network model is incomplete,
    CA Spectrum
    may be unable to find the root cause of a network outage. In this case, the status of all devices affected by the outage is set to gray, and a red unresolved fault alarm is generated. This alarm indicates that
    CA Spectrum
    has lost contact with a group of devices, but was unable to pinpoint the cause.
    All of the devices to which
    CA Spectrum
    has lost contact are listed in the impact scope of the alarm. The model name and other details of the lost devices also appear in the event that generated the alarm.
    The Unresolved Fault Alarm Disposition field lets you control how the unresolved fault alarm is generated. When set to Fault Isolation Model, the alarm will be generated on the Fault Isolation model. When set to Device In Fault Domain, the alarm will be generated on one of the devices with which
    CA Spectrum
    has lost contact. When determining which device to generate the alarm on,
    CA Spectrum
    looks for the device with the highest criticality. If the highest criticality is shared by two or more devices,
    CA Spectrum
    generates the alarm on the first of these devices that it finds. If all devices have the same criticality, then
    CA Spectrum
    chooses the device with the lowest model handle.
    : The default behavior is to place Unresolved Fault Alarms on the Fault Isolation model. Most users prefer to have unresolved fault alarms placed on a device in the fault domain, where the problem is more visible. This default behavior can be changed from "Unresolved Fault Alarm Disposition.
  • WA Link Fault Isolation Mode
    Specifies whether WA_Link models are considered neighbors for fault isolation purposes. Options are Normal and Transparent.
    Default:
    Normal