管理信息庫(kù)MIB:任何一個(gè)被管理的資源都表示成一個(gè)對(duì)象,稱為被管理的對(duì)象。MIB是被管理對(duì)象的集合。它定義了被管理對(duì)象的一系列屬性:對(duì)象的名稱、對(duì)象的訪問(wèn)權(quán)限和對(duì)象的數(shù)據(jù)類型等。每個(gè)SNMP設(shè)備(Agent)都有自己的MIB。MIB也可以看作是NMS(網(wǎng)管系統(tǒng))和Agent之間的溝通橋梁。
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MIB文件中的變量使用的名字取自ISO和ITU管理的對(duì)象標(biāo)識(shí)符(objectidentifier)名字空間。它是一種分級(jí)樹(shù)的結(jié)構(gòu)。如圖2所示,第一級(jí)有三個(gè)節(jié)點(diǎn):ccitt、iso、iso-ccitt。低級(jí)的對(duì)象ID分別由相關(guān)組織分配。一個(gè)特定對(duì)象的標(biāo)識(shí)符可通過(guò)由根到該對(duì)象的路徑獲得。一般網(wǎng)絡(luò)設(shè)備取iso節(jié)點(diǎn)下的對(duì)象內(nèi)容。如名字空間ip結(jié)點(diǎn)下一個(gè)名字為ipInReceives的MIB變量被指派數(shù)字值3,因而該變量的名字為:iso.org.dod.internet.mgmt.mib.ip.ipInReceives
相應(yīng)的數(shù)字表示(對(duì)象標(biāo)識(shí)符OID,唯一標(biāo)識(shí)一個(gè)MIB對(duì)象)為:1.3.6.1.2.1.4.3
oid:
.1.3.6.1.2.1.4
oid: .1.3.6.1.2.1.4.21
DEll 沒(méi)有這個(gè)oid
例子:
iso.org.dod.internet.mgmt.mib.ip. ipRouteTable.ipRouteEntry.ipRouteNextHop.202.120.86.71,
1.3.6.1.2.1.4.21.1.7.202.120.86.71
oid = 1.3.6.1.2.1.4.21.1.1
IP-MIB::ip.21.1.1.0.0.0.0 = IpAddress: 0.0.0.0
IP-MIB::ip.21.1.1.10.10.4.0 = IpAddress: 10.10.4.0
IP-MIB::ip.21.1.1.10.10.4.236 = IpAddress: 10.10.4.236
IP-MIB::ip.21.1.1.10.10.4.255 = IpAddress: 10.10.4.255
IP-MIB::ip.21.1.1.127.0.0.0 = IpAddress: 127.0.0.0
IP-MIB::ip.21.1.1.127.0.0.1 = IpAddress: 127.0.0.1
IP-MIB::ip.21.1.1.127.255.255.255 = IpAddress: 127.255.255.255
IP-MIB::ip.21.1.1.255.255.255.255 = IpAddress: 255.255.255.255
oid = `.1.3.6.1.2.1.4.21.1.7`
IP-MIB::ip.21.1.7.0.0.0.0 = IpAddress: 10.10.4.254
IP-MIB::ip.21.1.7.10.10.4.0 = IpAddress: 10.10.4.236
IP-MIB::ip.21.1.7.10.10.4.236 = IpAddress: 127.0.0.1
IP-MIB::ip.21.1.7.10.10.4.255 = IpAddress: 127.0.0.1
IP-MIB::ip.21.1.7.127.0.0.0 = IpAddress:127.0.0.1
IP-MIB::ip.21.1.7.127.0.0.1 = IpAddress: 127.0.0.1
IP-MIB::ip.21.1.7.127.255.255.255 = IpAddress: 127.0.0.1
IP-MIB::ip.21.1.7.255.255.255.255 = IpAddress: 127.0.0.1
oid = `.1.3.6.1.2.1.4.21.1.11`
IP-MIB::ip.21.1.11.0.0.0.0 = IpAddress: 0.0.0.0
IP-MIB::ip.21.1.11.10.10.4.0 = IpAddress: 255.255.255.0
IP-MIB::ip.21.1.11.10.10.4.236 = IpAddress: 255.255.255.255
IP-MIB::ip.21.1.11.10.10.4.255 = IpAddress: 255.255.255.255
IP-MIB::ip.21.1.11.127.0.0.0 = IpAddress: 255.0.0.0
IP-MIB::ip.21.1.11.127.0.0.1 = IpAddress: 255.255.255.255
IP-MIB::ip.21.1.11.127.255.255.255 = IpAddress: 255.255.255.255
IP-MIB::ip.21.1.11.255.255.255.255 = IpAddress: 255.255.255.255
oid = 1.3.6.1.2.1.4.21.1.8
IP-MIB::ip.21.1.8.0.0.0.0 = INTEGER: 3
IP-MIB::ip.21.1.8.10.10.4.0 = INTEGER: 3
IP-MIB::ip.21.1.8.10.10.4.243 = INTEGER: 3
IP-MIB::ip.21.1.8.10.10.4.255 = INTEGER: 3
IP-MIB::ip.21.1.8.127.0.0.0 = INTEGER: 3
IP-MIB::ip.21.1.8.127.0.0.1 = INTEGER: 3
IP-MIB::ip.21.1.8.127.255.255.255 = INTEGER: 3
IP-MIB::ip.21.1.8.255.255.255.255 = INTEGER: 3
.1.3.6.1.2.1.2
OID = .1.3.6.1.2.1.2.2.1.2
ifSpeed 端口速率
ifInOctets端口進(jìn)出流量
以華三V7為例:
qsnmpwalk 10.11.254.1 sysDescr
SNMPv2-MIB::sysDescr.0 = STRING: H3C Comware Platform Software, Software Version 7.1.070, Release 2510P01
H3C S6800-54QT
Copyright (c) 2004-2017 New H3C Technologies Co., Ltd. All rights reserved.
得到交換機(jī)具體端口下的MAC地址。
得到MAC地址與PortInterger的對(duì)應(yīng)關(guān)系
qsnmpwalk 10.11.254.1 1.3.6.1.2.1.17.7.1.2.2.1.2
SNMPv2-SMI::mib-2.17.7.1.2.2.1.2.1000.88.105.108.194.51.215 = INTEGER: 1613
SNMPv2-SMI::mib-2.17.7.1.2.2.1.2.1000.88.105.108.194.131.239 = INTEGER: 1613
...
得到PortInterger與IfIndex的對(duì)應(yīng)關(guān)系
qsnmpwalk 10.11.254.1 1.3.6.1.2.1.17.1.4.1.2
SNMPv2-SMI::mib-2.17.1.4.1.2.1 = INTEGER: 1
SNMPv2-SMI::mib-2.17.1.4.1.2.2 = INTEGER: 2
...
SNMPv2-SMI::mib-2.17.1.4.1.2.1613 = INTEGER: 1619
得到IfIndex與ifDescr的對(duì)應(yīng)關(guān)系
IF-MIB::ifDescr.1 = STRING: Ten-GigabitEthernet1/0/1
IF-MIB::ifDescr.2 = STRING: Ten-GigabitEthernet1/0/2
...
IF-MIB::ifDescr.1613 = STRING: NULL0
IF-MIB::ifDescr.1619 = STRING: Bridge-Aggregation1
最終對(duì)應(yīng)關(guān)系:
Bridge-Aggregation1 - 1619 - 1613 - 一堆mac
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