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# 2 特殊なOID

最もよく使われるSNMP OIDのいくつかは、Zabbixによって自動的に数値表現に変換されます。
例えば、**ifIndex**は**1.3.6.1.2.1.2.2.1.1**に、 **ifIndex.0**は**1.3.6.1.2.1.2.2.1.1.0**に変換されます。

この表は、特殊なOIDのリストです。

|特殊OID|識別子|説明|
|--|--|------|
|ifIndex|1.3.6.1.2.1.2.2.1.1|A unique value for each interface.|
|ifDescr|1.3.6.1.2.1.2.2.1.2|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.|
|ifType|1.3.6.1.2.1.2.2.1.3|The type of interface, distinguished according to the physical/link protocol(s) immediately 'below' the network layer in the protocol stack.|
|ifMtu|1.3.6.1.2.1.2.2.1.4|The size of the largest datagram which can be sent / received on the interface, specified in octets.|
|ifSpeed|1.3.6.1.2.1.2.2.1.5|An estimate of the interface's current bandwidth in bits per second.|
|ifPhysAddress|1.3.6.1.2.1.2.2.1.6|The interface's address at the protocol layer immediately \`below' the network layer in the protocol stack.|
|ifAdminStatus|1.3.6.1.2.1.2.2.1.7|The current administrative state of the interface.|
|ifOperStatus|1.3.6.1.2.1.2.2.1.8|The current operational state of the interface.|
|ifInOctets|1.3.6.1.2.1.2.2.1.10|The total number of octets received on the interface, including framing characters.|
|ifInUcastPkts|1.3.6.1.2.1.2.2.1.11|The number of subnetwork-unicast packets delivered to a higher-layer protocol.|
|ifInNUcastPkts|1.3.6.1.2.1.2.2.1.12|The number of non-unicast (i.e., subnetwork- broadcast or subnetwork-multicast) packets delivered to a higher-layer protocol.|
|ifInDiscards|1.3.6.1.2.1.2.2.1.13|The number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being deliverable to a higher-layer protocol. One possible reason for discarding such a packet could be to free up buffer space.|
|ifInErrors|1.3.6.1.2.1.2.2.1.14|The number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.|
|ifInUnknownProtos|1.3.6.1.2.1.2.2.1.15|The number of packets received via the interface which were discarded because of an unknown or unsupported protocol.|
|ifOutOctets|1.3.6.1.2.1.2.2.1.16|The total number of octets transmitted out of the interface, including framing characters.|
|ifOutUcastPkts|1.3.6.1.2.1.2.2.1.17|The total number of packets that higher-level protocols requested be transmitted, and which were not addressed to a multicast or broadcast address at this sub-layer, including those that were discarded or not sent.|
|ifOutNUcastPkts|1.3.6.1.2.1.2.2.1.18|The total number of packets that higher-level protocols requested be transmitted, and which were addressed to a multicast or broadcast address at this sub-layer, including those that were discarded or not sent.|
|ifOutDiscards|1.3.6.1.2.1.2.2.1.19|The number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space.|
|ifOutErrors|1.3.6.1.2.1.2.2.1.20|The number of outbound packets that could not be transmitted because of errors.|
|ifOutQLen|1.3.6.1.2.1.2.2.1.21|The length of the output packet queue (in packets).|

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