以思科交换机为例；

通过snmp协议来进行监控，重点是思科交换机oid信息库的收集

1.与内存有关的oid

### THIS FILE WAS GENERATED BY MIB2SCHEMA
"org"       "1.3"
"dod"       "1.3.6"
"internet"      "1.3.6.1"
"directory"     "1.3.6.1.1"
"mgmt"      "1.3.6.1.2"
"experimental"      "1.3.6.1.3"
"private"       "1.3.6.1.4"
"enterprises"       "1.3.6.1.4.1"
"cisco"     "1.3.6.1.4.1.9"
"ciscoMgmt"     "1.3.6.1.4.1.9.9"
"ciscoMemoryPoolMIB"        "1.3.6.1.4.1.9.9.48"
"ciscoMemoryPoolObjects"        "1.3.6.1.4.1.9.9.48.1"
"ciscoMemoryPoolNotifications"      "1.3.6.1.4.1.9.9.48.2"
"ciscoMemoryPoolConformance"        "1.3.6.1.4.1.9.9.48.3"
"ciscoMemoryPoolTable"      "1.3.6.1.4.1.9.9.48.1.1"
"ciscoMemoryPoolUtilizationTable"       "1.3.6.1.4.1.9.9.48.1.2"
"ciscoMemoryPoolEntry"      "1.3.6.1.4.1.9.9.48.1.1.1"
"ciscoMemoryPoolType"       "1.3.6.1.4.1.9.9.48.1.1.1.1"
"ciscoMemoryPoolName"       "1.3.6.1.4.1.9.9.48.1.1.1.2"
"ciscoMemoryPoolAlternate"      "1.3.6.1.4.1.9.9.48.1.1.1.3"
"ciscoMemoryPoolValid"      "1.3.6.1.4.1.9.9.48.1.1.1.4"
"ciscoMemoryPoolUsed"       "1.3.6.1.4.1.9.9.48.1.1.1.5"
"ciscoMemoryPoolFree"       "1.3.6.1.4.1.9.9.48.1.1.1.6"
"ciscoMemoryPoolLargestFree"        "1.3.6.1.4.1.9.9.48.1.1.1.7"
"ciscoMemoryPoolUtilizationEntry"       "1.3.6.1.4.1.9.9.48.1.2.1"
"ciscoMemoryPoolUtilization1Min"        "1.3.6.1.4.1.9.9.48.1.2.1.1"
"ciscoMemoryPoolUtilization5Min"        "1.3.6.1.4.1.9.9.48.1.2.1.2"
"ciscoMemoryPoolUtilization10Min"       "1.3.6.1.4.1.9.9.48.1.2.1.3"
"ciscoMemoryPoolCompliances"        "1.3.6.1.4.1.9.9.48.3.1"
"ciscoMemoryPoolGroups"     "1.3.6.1.4.1.9.9.48.3.2"
"ciscoMemoryPoolCompliance"     "1.3.6.1.4.1.9.9.48.3.1.1"
"ciscoMemoryPoolComplianceRev1"     "1.3.6.1.4.1.9.9.48.3.1.2"
"ciscoMemoryPoolGroup"      "1.3.6.1.4.1.9.9.48.3.2.1"
"ciscoMemoryPoolUtilizationGroup"       "1.3.6.1.4.1.9.9.48.3.2.2"

内存当前使用情况：1.3.6.1.4.1.9.9.48.1.1.1.5

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.9.48.1.1.1.5
SNMPv2-SMI::enterprises.9.9.48.1.1.1.5.1 = Gauge32: 18496352
SNMPv2-SMI::enterprises.9.9.48.1.1.1.5.2 = Gauge32: 5293608
SNMPv2-SMI::enterprises.9.9.48.1.1.1.5.16 = Gauge32: 40

三种内存种类：

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.9.48.1.1.1.2
SNMPv2-SMI::enterprises.9.9.48.1.1.1.2.1 = STRING: "Processor"
SNMPv2-SMI::enterprises.9.9.48.1.1.1.2.2 = STRING: "I/O"
SNMPv2-SMI::enterprises.9.9.48.1.1.1.2.16 = STRING: "Driver text"

内存当前的剩余情况:1.3.6.1.4.1.9.9.48.1.1.1.6

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.9.48.1.1.1.6
SNMPv2-SMI::enterprises.9.9.48.1.1.1.6.1 = Gauge32: 55472564
SNMPv2-SMI::enterprises.9.9.48.1.1.1.6.2 = Gauge32: 9386456
SNMPv2-SMI::enterprises.9.9.48.1.1.1.6.16 = Gauge32: 1048536

2.与cpu有关的oid

过去5秒钟cpu繁忙百分比：1.3.6.1.4.1.9.2.1.56.0

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.2.1.56.0
SNMPv2-SMI::enterprises.9.2.1.56.0 = INTEGER: 22

过去1分钟cpu繁忙百分比：1.3.6.1.4.1.9.2.1.57.0

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.2.1.57.0
SNMPv2-SMI::enterprises.9.2.1.57.0 = INTEGER: 21

过去5分钟cpu繁忙百分比：1.3.6.1.4.1.9.2.1.58.0

[root@jiankong-centos ~]# snmpwalk -v2c -c iwgame 172.16.1.17 1.3.6.1.4.1.9.2.1.58.0
SNMPv2-SMI::enterprises.9.2.1.58.0 = INTEGER: 21

思科交换机oid查询网址：

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en