1、首先，在华为的私有MIB中有一个hwEntityExtentMIB，其中的两个节点分别标明了收发光功率，节点名和OID分别如下
Name: hwEntityOpticalRxPower
Type: OBJECT-TYPE
OID: 1.3.6.1.4.1..5.25.31.1.1.3.1.8
Name: hwEntityOpticalTxPower
Type: OBJECT-TYPE
OID: 1.3.6.1.4.1..5.25.31.1.1.3.1.9
2、读取这两个节点，可以得到光功率，以收光功率为例
***** SNMP QUERY STARTED *****
1: hwEntityOpticalRxPower.17170689 (integer) 0
2: hwEntityOpticalRxPower.17170690 (integer) 0
3: hwEntityOpticalRxPower.17170691 (integer) -3301
4: hwEntityOpticalRxPower.17170692 (integer) 0
5: hwEntityOpticalRxPower.17170693 (integer) 0
6: hwEntityOpticalRxPower.17170694 (integer) 0
7: hwEntityOpticalRxPower.17170695 (integer) 0
8: hwEntityOpticalRxPower.17170696 (integer) 0
9: hwEntityOpticalRxPower.17432833 (integer) -568
10: hwEntityOpticalRxPower.17432834 (integer) -548
11: hwEntityOpticalRxPower.17432835 (integer) 0
12: hwEntityOpticalRxPower.17432836 (integer) 0
13: hwEntityOpticalRxPower.17563905 (integer) 0
14: hwEntityOpticalRxPower.17563906 (integer) -3301
15: hwEntityOpticalRxPower.17563907 (integer) -483
16: hwEntityOpticalRxPower.17563908 (integer) -537
17: hwEntityOpticalRxPower.17563909 (integer) -572
18: hwEntityOpticalRxPower.17563910 (integer) -4000
19: hwEntityOpticalRxPower.17563911 (integer) -2769
20: hwEntityOpticalRxPower.17563912 (integer) -2958
21: hwEntityOpticalRxPower.17563913 (integer) -445
22: hwEntityOpticalRxPower.17563914 (integer) -3096
23: hwEntityOpticalRxPower.17563915 (integer) -4000
24: hwEntityOpticalRxPower.17563916 (integer) -752
25: hwEntityOpticalRxPower.17564161 (integer) -4000
***** SNMP QUERY FINISHED *****
3、下一步要做的，就是如何将光功率和，接口对应，这里使用的不是常用的ifindex，其实收发光功率节点所在的表接口，描述信息中，说明了这个表的索引，使用的是entPhysicalIndex
Name: hwOpticalModuleInfoEntry
Type: OBJECT-TYPE
OID: 1.3.6.1.4.1..5.25.31.1.1.3.1
Indexes: 1: entPhysicalIndex
4、搜索该节点entPhysicalIndex ，可以看到一个表
这个表中有两个节点，分别是实体的描述和实体的名字，在实体的描述中可以看到光模块类型，实体的名字中，可以看到接口和索引的对应关系
Name: entPhysicalDescr
Type: OBJECT-TYPE
OID: 1.3.6.1.2.1.47.1.1.1.1.2
Name: entPhysicalName
Type: OBJECT-TYPE
OID: 1.3.6.1.2.1.47.1.1.1.1.7
比如收发光功率中，24: hwEntityOpticalRxPower.17563916 (integer) -752 ，索引为17563916的接口光模块收光功率为-752
根据这个索引，读取entPhysicalDescr 和entPhysicalName ，可以得到光模块的类型及对应接口
1: entPhysicalDescr.17563916 (octet string) 2100Mb/s-850nm-LC-300m(0.05mm)-150m(0.0625mm)
1: entPhysicalName.17563916 (octet string) GigabitEthernet12/0/11
5、值得注意的是，在接口收发光功率的节点描述中，说明了MIB读取到的值需要乘100
Name: hwEntityOpticalRxPower
Type: OBJECT-TYPE
OID: 1.3.6.1.4.1..5.25.31.1.1.3.1.8
Description: The receive power of the optical module. Unit: dBm. the value is expanded 100 times,so the real value should be reduced 100 times
