Filter policies can be used to control how cflowd sampling is performed on an IP interface. If an IP interface has cflowd sampling enabled, an operator can exclude some flows for interface sampling by configuring filter policy rules that match the flows and by disabling interface sampling as part of the filter policy entry configurations (interface-disable-sample). If an IP interface has cflowd sampling disabled, an operator can enable cflowd sampling on a subset of flows by configuring filter policy rules that match the flows and by enabling cflowd sampling as part of the filter policy entry configurations (filter-sample).
The above cflowd filter sampling behavior is exclusively driven by match criteria. The sampling logic applies regardless of whether an action was executed (including evaluation of conditional action match criteria, for example, packet-length or ttl).