如何使用MIB讀取接口收發(fā)光功率

1、首先，在華為的私有MIB中有一個hwEntityExtentMIB，其中的兩個節(jié)點分別標明了收發(fā)光功率，節(jié)點名和OID分別如下

 Name: hwEntityOpticalRxPower 

Type: OBJECT-TYPE 
OID: 1.3.6.1.4.1.2011.5.25.31.1.1.3.1.8

Name: hwEntityOpticalTxPower 
Type: OBJECT-TYPE 
OID: 1.3.6.1.4.1.2011.5.25.31.1.1.3.1.9

 2、讀取這兩個節(jié)點，可以得到光功率，以收光功率為例

***** 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，就是如何將光功率和，接口對應，這里使用的不是常用的ifindex，其實收發(fā)光功率節(jié)點所在的表接口，描述信息中，說明了這個表的索引，使用的是entPhysicalIndex

 Name: hwOpticalModuleInfoEntry 

Type: OBJECT-TYPE 
OID: 1.3.6.1.4.1.2011.5.25.31.1.1.3.1

 Indexes: 1: entPhysicalIndex

 4、搜索該節(jié)點entPhysicalIndex ，可以看到一個表

這個表中有兩個節(jié)點，分別是實體的描述和實體的名字，在實體的描述中可以看到光模塊類型，實體的名字中，可以看到接口和索引的對應關系

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

 比如收發(fā)光功率中，24: hwEntityOpticalRxPower.17563916 (integer) -752 ，索引為17563916的接口光模塊收光功率為-752

 根據(jù)這個索引，讀取entPhysicalDescr 和entPhysicalName ，可以得到光模塊的類型及對應接口

 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，在接口收發(fā)光功率的節(jié)點描述中，說明了MIB讀取到的值需要乘100

 Name: hwEntityOpticalRxPower 

Type: OBJECT-TYPE 
OID: 1.3.6.1.4.1.2011.5.25.31.1.1.3.1.8 

 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 

根據(jù)索引可以確認接口光功率

根據(jù)索引可以確認接口光功率 

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