Description: The history of which this entry is a part. The history identified by a particular value of this index is the same history as identified by the same value of historyControlIndex.

etherExHistoryIndex of huawei optix devices can be described as following, etherExHistoryIndex consists of SLOT_ID,PORT_ID,SUB_PORT_ID and PERIOD_TYPE. etherExHistoryIndex = SUB_PORT_ID<<31 + SLOT_ID<<24 + PERIOD_TYPE<<16 + PORT_ID; 1) 31bit(1bit) SUB_PORT_ID 1bit: 0 - SUB_PORT_1(east), 1 - SUB_PORT_2(west) for sonet,this para is 0 ,no other means; 2) 24bit~30bit(7bits) SLOT_ID: slot id; 3) 16bit~23(8bits) PERIOD_TYPE: period type; 0x1 - 30s(30 seconds) 0x2 - 30m(30 minutes) 0x3 - prdvar(var period) 4) 0bit~15bit(16bits) PORT_ID: mac port id;

For example: 1: etherExHistoryIndex.83951617 (gauge) 83951617 83951617 = 0x05010001 can be translated as Slot-5,PrdType-30s,Port-1; 2: etherExHistoryIndex.84017153 (gauge) 84017153 84017153 = 0x05020001 can be translated as Slot-5,PrdType-30m,Port-1; 3: etherExHistoryIndex.84082696 (gauge) 84082696 84082696 = 0x05030008 can be translated as Slot-5,PrdType-prdvar,Port-8;