This notification-only octet string carries a list of interfaces relevant to a FlexE trap, such as those affected by an oversized delay condition. An admin inspects this list in a received hh3cFlexEPhyDelayOverAlarm trap to identify exactly which member interfaces of a FlexE group are experiencing the reported delay problem. For example, a hh3cFlexEPhyDelayOverAlarm trap whose port list names two of four group member ports tells the admin to focus troubleshooting on those two links specifically.