📄 rfc1156.txt
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McCloghrie & Rose [Page 10] RFC 1156 MIB May 19905.2. The Interfaces Group Implementation of the Interfaces group is mandatory for all systems. OBJECT: ------- ifNumber { interfaces 1 } Syntax: INTEGER Definition: The number of network interfaces (regardless of their current state) on which this system can send/receive IP datagrams. Access: read-only. Status: mandatory.5.2.1. The Interfaces Table OBJECT: ------- ifTable { interfaces 2 } Syntax: SEQUENCE OF IfEntry Definition: A list of interface entries. The number of entries is given by the value of ifNumber. Access: read-write. Status: mandatory. OBJECT: ------- ifEntry { ifTable 1 } Syntax: IfEntry ::= SEQUENCE {McCloghrie & Rose [Page 11] RFC 1156 MIB May 1990 ifIndex INTEGER, ifDescr OCTET STRING, ifType INTEGER, ifMtu INTEGER, ifSpeed Gauge, ifPhysAddress OCTET STRING, 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 } Definition: An interface entry containing objects at the subnetwork layer and below for a particular interface.McCloghrie & Rose [Page 12] RFC 1156 MIB May 1990 Access: read-write. Status: mandatory. We now consider the individual components of each interface entry: OBJECT: ------- ifIndex { ifEntry 1 } Syntax: INTEGER Definition: 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 re- initialization of the entity's network management system to the next re-initialization. Access: read-only. Status: mandatory. OBJECT: ------- ifDescr { ifEntry 2 } Syntax: OCTET STRING Definition: A text 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. The string is intended for presentation to a human; it must not contain anything but printable ASCII characters.McCloghrie & Rose [Page 13] RFC 1156 MIB May 1990 Access: read-only. Status: mandatory. OBJECT: ------- ifType { ifEntry 3 } Syntax: INTEGER { other(1), -- none of the following regular1822(2), hdh1822(3), ddn-x25(4), rfc877-x25(5), ethernet-csmacd(6), iso88023-csmacd(7), iso88024-tokenBus(8), iso88025-tokenRing(9), iso88026-man(10), starLan(11), proteon-10MBit(12), proteon-80MBit(13), hyperchannel(14), fddi(15), lapb(16), sdlc(17), t1-carrier(18), cept(19), -- european equivalent of T-1 basicIsdn(20), primaryIsdn(21), -- proprietary serial propPointToPointSerial(22) } Definition: The type of interface, distinguished according to the physical/link/network protocol(s) immediately "below" IP in the protocol stack. Access: read-only. Status: mandatory.McCloghrie & Rose [Page 14] RFC 1156 MIB May 1990 OBJECT: ------- ifMtu { ifEntry 4 } Syntax: INTEGER Definition: The size of the largest IP datagram which can be sent/received on the interface, specified in octets. Access: read-only. Status: mandatory. OBJECT: ------- ifSpeed { ifEntry 5 } Syntax: Gauge Definition: An estimate of the interface's current bandwidth in bits per second. For interfaces which do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth. Access: read-only. Status: mandatory. OBJECT: ------- ifPhysAddress { ifEntry 6 } Syntax: OCTET STRING Definition: The interface's address at the protocol layer immediatelyMcCloghrie & Rose [Page 15] RFC 1156 MIB May 1990 "below" IP in the protocol stack. For interfaces which do not have such an address (e.g., a serial line), this object should contain an octet string of zero length. Access: read-only. Status: mandatory. OBJECT: ------- ifAdminStatus { ifEntry 7 } Syntax: INTEGER { up(1), -- ready to pass packets down(2), testing(3) -- in some test mode } Definition: The desired state of the interface. The testing(3) state indicates that no operational packets can be passed. Access: read-write. Status: mandatory. OBJECT: ------- ifOperStatus { ifEntry 8 } Syntax: INTEGER { up(1), -- ready to pass packets down(2), testing(3) -- in some test mode } Definition: The current operational state of the interface. The testing(3) state indicates that no operational packets can be passed.McCloghrie & Rose [Page 16] RFC 1156 MIB May 1990 Access: read-only. Status: mandatory. OBJECT: ------- ifLastChange { ifEntry 9 } Syntax: TimeTicks Definition: The value of sysUpTime at the time the interface entered its current operational state. If the current state was entered prior to the last re-initialization of the local network management subsystem, then this object contains a zero value. Access: read-only. Status: mandatory. OBJECT: ------- ifInOctets { ifEntry 10 } Syntax: Counter Definition: The total number of octets received on the interface, including framing characters. Access: read-only. Status: mandatory.McCloghrie & Rose [Page 17] RFC 1156 MIB May 1990 OBJECT: ------- ifInUcastPkts { ifEntry 11 } Syntax: Counter Definition: The number of (subnet) unicast packets delivered to a higher-layer protocol. Access: read-only. Status: mandatory. OBJECT: ------- ifInNUcastPkts { ifEntry 12 } Syntax: Counter Definition: The number of non-unicast (i.e., subnet broadcast or subnet multicast) packets delivered to a higher-layer protocol. Access: read-only. Status: mandatory. OBJECT: ------- ifInDiscards { ifEntry 13 } Syntax: Counter Definition: 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-layerMcCloghrie & Rose [Page 18] RFC 1156 MIB May 1990 protocol. One possible reason for discarding such a packet could be to free up buffer space. Access: read-only. Status: mandatory. OBJECT: ------- ifInErrors { ifEntry 14 } Syntax: Counter Definition: The number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol. Access: read-only. Status: mandatory. OBJECT: ------- ifInUnknownProtos { ifEntry 15 } Syntax: Counter Definition: The number of packets received via the interface which were discarded because of an unknown or unsupported protocol. Access: read-only. Status: mandatory.⌨️ 快捷键说明
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