Use the following CLI syntax to enable traffic sampling on an interface.
config>router>if>cflowd-paramters#
sampling {unicast|multicast} type {interface} [direction {ingress-only}]
no sampling {unicast|multicast}
When the interface option is configured, cflowd extracts traffic flow samples from an interface for analysis. All packets forwarded by the interface are analyzed in accordance with the cflowd configuration.
Configure the interface option to enable traffic sampling on an interface. If cflowd is not enabled (no cflowd), traffic sampling does not occur on the interface.