- Entry:
- TOP
- Event:
- TG created from a checkpointed topology data set
- Modules Generating Entry:
- ISTTRHTG
This trace record is issued when a TG record is created
from a checkpointed topology data set. 
- Byte (hex)
- Contents
- 00–02
- Record ID: C'TOP'
- 03
- Action
- C'C' Create TG record
- 04
- Status byte from the CV47
- 05
- Flags byte from the CV4680
- 06
- Flag byte
- Bit
- Meaning
- 111. ....
- TG type from TGREC
- B'000'
- Endpoint TG
- B'001'
- Intermediate routing TG
- B'010'
- Interchange TG
- B'011'
- Intersubnet TG
- B'100'
- Branch extender TG
- ...1 ....
- Garbage collection indicator from TGREC
- .... 1...
- Adjacent node's HPRTT value from TGREC
- .... .11.
- Local node's HPR/HPRTT values from TGREC
- 07
- Number of days left before TGREC is garbage collected
- 08–0B
- 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 CV46 and CV47)
- 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 CV46 and CV47)
- 14–17
- Last FRSN received from the TOPO data set
- 18–1B
- Resource sequence number (RSN) from CV47 in the TOPO data set
- 1C–1F
- First word of timestamp for trace entry