RFC1213-MIB DEFINITIONS ::= BEGIN *定义了MIB文件的名称，RFC1213就是MIB2 * IMPORTS *从其他MIB中输入文件类型或者是OID * mgmt, NetworkAddress, IpAddress, Counter, Gauge, TimeTicks FROM RFC1155-SMI *从RFC1155(SMIv1)中输入mgmt，networkaddress等内容* OBJECT-TYPE FROM RFC 1212; *从RFC1212中输入对象类型 * mib-2 OBJECT IDENTIFIER ::= { mgmt 1 } *定义mib2为mgmt叶子节点编号为1及1.3.6.1.2.1 ，Eric note，这里可能就是最上面的一个节点* -- groups in MIB-II system OBJECT IDENTIFIER ::= { mib-2 1 } *定义MIB2的子树 system=1.3.6.1.2.1.1* interfaces OBJECT IDENTIFIER ::= { mib-2 2 } *定义MIB2的子树 int=1.3.6.1.2.1.2* at OBJECT IDENTIFIER ::= { mib-2 3 } ip OBJECT IDENTIFIER ::= { mib-2 4 } icmp OBJECT IDENTIFIER ::= { mib-2 5 } tcp OBJECT IDENTIFIER ::= { mib-2 6 } udp OBJECT IDENTIFIER ::= { mib-2 7 } egp OBJECT IDENTIFIER ::= { mib-2 8 } transmission OBJECT IDENTIFIER ::= { mib-2 10 } snmp OBJECT IDENTIFIER ::= { mib-2 11 } -- the Interfaces table -- The Interfaces table contains information on the entity's -- interfaces. Each interface is thought of as being -- attached to a 'subnetwork.' Note that this term should -- not be confused with 'subnet,' which refers to an -- addressing-partitioning scheme used in the Internet -- suite of protocols. ifTable OBJECT-TYPE *定义MIB2子集ifTable，首字母小写由ASN.1定义* SYNTAX SEQUENCE OF IfEntry *定义数据类型为SEQUENCE OF IfEntry* ACCESS not-accessible *定义存取方式为不能通过任何方式请求agent的变量值* STATUS mandatory *定义状态为强制，agent必须按照MIB2规定的执行* DESCRIPTION *定义此对象的说明* "A list of interface entries. The number of entries is given by the value of ifNumber." ::= { interfaces 2 } *OID=1.3.6.1.2.1.2.2* ifEntry OBJECT-TYPE SYNTAX IfEntry *数据类型在后面的表格中对应* ACCESS not-accessible STATUS mandatory DESCRIPTION "An interface entry containing objects at the subnetwork layer and below for a particular interface." INDEX { ifIndex } *对应到后面的定义，如果有6个端口，IfEntry表中有6个表项* ::= { ifTable 1 } *OID=1.3.6.1.2.1.2.2.1* IfEntry ::= *定义一张的表，注意首字母大写，区别于对象的定义* SEQUENCE { ifIndex INTEGER, ifDescr DisplayString, ifType INTEGER, ifMtu INTEGER, ifSpeed Gauge, ifPhysAddress PhysAddress, ifAdminStatus INTEGER, ifOperStatus INTEGER, ifLastChange TimeTicks, ifInOctets Counter, ifInUcastPkts Counter, ifInNUcastPkts Counter, ifInDiscards Counter, ifInErrors Counter, ifInUnknownProtos Counter, ifOutOctets Counter, ifOutUcastPkts Counter, ifOutNUcastPkts Counter, ifOutDiscards Counter, ifOutErrors Counter, ifOutQLen Gauge, ifSpecific OBJECT IDENTIFIER } ifIndex OBJECT-TYPE SYNTAX INTEGER *定义数据类型为整数* ACCESS read-only *定义存取方式为只读* STATUS mandatory DESCRIPTION "A unique value for each interface. Its value ranges between 1 and the value of ifNumber. The value for each interface must remain constant at least from one reinitialization of the entity's network management system to the next reinitialization." ::= { ifEntry 1 } ifDescr OBJECT-TYPE SYNTAX DisplayString (SIZE (0..255)) ACCESS read-only STATUS mandatory DESCRIPTION "A textual string containing information about the interface. This string should include the name of the manufacturer, the product name, and the version of the hardware interface." ::= { ifEntry 2 } END
