In some situations it might be desirable to configure different polling parameters and thresholds for different devices. For example, you might want to monitor in a different way your most critical devices, like your core routers. For that purpose, customizable device groups can be configured containint your critical and non-critical devices, and polling parameters and thresholds can be configured accordingly.
More information about DFM Customizable Groups: http://www.cisco.com/en/US/docs/net_mgmt/ciscoworks_device_fault_manager/3.1/user/guide/cfgGroup.html#wp1059743
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