This read-only Counter reports the number of times this node sent an ICMP time-exceeded message for a datagram it couldn't reassemble before the reassembly timer expired. An admin would watch this counter for signs that this node itself is failing to reassemble fragmented packets in time, potentially due to fragment loss or resource exhaustion. For example, a rising cnticmpOutTmFrags count during high traffic load would suggest this node is running short on reassembly buffer resources.