This read-only counter tracks the number of CLNP PDUs that this entity successfully segmented, meaning fragmented, before onward transmission. An admin uses this to see how often this entity itself has to break up oversized PDUs, which happens when an outgoing PDU exceeds what the next hop or path can carry unfragmented. For example, a router connecting a network segment with a large PDU size limit to one with a smaller limit would show this counter climbing as it segments PDUs to fit the smaller path.