- Entry:
- TOP
- Event:
- Node created from a checkpointed topology data set
- Modules Generating Entry:
- ISTTRHND
This trace record is issued when a node record is created
from a checkpointed topology data set. 
- Byte (hex)
- Contents
- 00–02
- Record ID: C'TOP'
- 03
- Action
- C'C' Create node record
- 04–06
- Flag bytes from the CV4580
- 07
- Number of days left before NDREC is garbage collected
- 08
- Flag byte
- Bit
- Meaning
- 11.. ....
- Node type from TOPO data set
- B'00'
- End node
- B'01'
- Network node
- B'10'
- Virtual node
- ..1. ....
- Adjacent node indicator from the TOPO data set
- ...1 ....
- Indicator of adjacent node's unknown control vector support, from the TOPO data set
- 09–0B
- 0
- 0C-0F
- Current flow reduction sequence number (FRSN), from the TOPO data set, for topology database updates (TDUs) that include unknown topology control vectors (any topology control vectors other than CV44 and CV45)
- 10–13
- Current FRSN, from the TOPO data set, for TDUs that do not include unknown topology control vectors (any topology control vectors other than CV44 and CV45)
- 14–17
- Last FRSN, from the TOPO data set, that is received from this adjacent node
- 18–1B
- Resource sequence number (RSN) from CV4580 in the TOPO data set
- 1C–1F
- First word of timestamp for trace entry