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Sample: Stating a MIP Problem presents a typical MIP problem. Here is the node log file for that problem with the default setting of the MIP display parameter:
These additional items appear only in the node log file (not on screen):
Variable
records the name of the variable where ILOG CPLEX branched to create this node. If the branch was due to a special ordered set, the name listed here will be the right-most variable in the left subset.
B
indicates the branching direction:
Parent
indicates the node number of the parent.
Depth
indicates the depth of this node in the branch & cut tree.