- Entry:
- MRG
- VIT option:
- CMIP
- Event:
- Resource updates sent to VTAM® topology agent
- VIT processing module:
- ISTITCCM
- Control is returned to:
- Module invoking the INTRACE macro that caused the record to be produced
This trace record is generated when the VTAM topology agent receives updates from VTAM for changes in VTAM resources. 
- Byte (hex)
- Contents
- 00–02
- Record ID: C"MRG"
- 03
- Object type. The type of resource causing the incoming update.
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- 0
- 06
- Action performed because of the incoming update.
- Bit
- Meaning
- 1... ....
- The incoming update is waiting to be merged with older updates before it is sent in a CMIP message.
- .1.. ....
- The incoming update is merged with older updates for resources that own the resource that caused this incoming update.
- ..1. ....
- The incoming update is merged with older updates for the same resource that caused the incoming update.
- ...1 ....
- The resource causing the incoming update has a different vertex 1 from the older, existing update for the same resource. This bit has meaning only when bit 2 is on.
- .... 1...
- The vertex 1 or line of the older, existing update is the resource that caused the incoming update. This bit has meaning only when bit 3 is on.
- .... .1..
- An older, existing update is sent before the incoming update because the incoming update cannot be merged with the older update.
- .... ..00
- Event report or notification
- .... ..01
- SNAlocaltopology
- .... ..10
- LUcollection
- .... ..11
- SNAnetwork
- 07
- 0
- 08–0F
- Name of the resource causing the incoming update
- 10
- Reason for the incoming update
- 11
- Reason for the older, existing update, if there is one
- 12
- Change in attribute value caused by the incoming update
- 13
- Change in attribute value caused by the older, existing update, if there is one
- 14–15
- Object flags indicated on the incoming update
- 16–17
- Object flags indicated on the older, existing update, if there is one
- 18
- The number of times resource updates for this particular resource were merged before the incoming update is processed. This number does not include the merges that occurred for resources that own this particular resource.
- 19
- Workarea flags
- 1A
- Flags contained in the Agent Support Request Mapping control block
- 1B
- 0
- 1C–1F
- Request parameter header (RPH) address