All MIBs › EtherLike-MIB › dot3StatsDuplexStatus
dot3StatsDuplexStatus
Module: EtherLike-MIB
OID (symbolic): EtherLike-MIB::dot3StatsDuplexStatus
OID (numeric): 1.3.6.1.2.1.10.7.2.1.19
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-only
Description: The current mode of operation of the MAC entity. 'unknown' indicates that the current duplex mode could not be determined.
Management control of the duplex mode is accomplished through the MAU MIB. When an interface does not support autonegotiation, or when autonegotiation is not enabled, the duplex mode is controlled using ifMauDefaultType. When autonegotiation is supported and enabled, duplex mode is controlled using ifMauAutoNegAdvertisedBits. In either case, the currently operating duplex mode is reflected both in this object and in ifMauType.
Note that this object provides redundant information with ifMauType. Normally, redundant objects are discouraged. However, in this instance, it allows a management application to determine the duplex status of an interface without having to know every possible value of ifMauType. This was felt to be sufficiently valuable to justify the redundancy.
What is dot3StatsDuplexStatus?
This value reports the duplex mode the interface's MAC is currently operating in: unknown, half-duplex, or full-duplex. Admins check it to confirm both ends of a link agree on duplex mode, since a mismatch between a full-duplex and half-duplex side is a classic cause of excessive collisions and poor throughput. For example, seeing 'halfDuplex' on a port an admin expected to auto-negotiate to full-duplex gigabit would flag a negotiation problem worth investigating.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.2.1.10.7.2.1.19 snmpwalk -v2c -c public <target> EtherLike-MIB::dot3StatsDuplexStatus
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.2.1.10.7.2.1.19.1 snmpget -v2c -c public <target> EtherLike-MIB::dot3StatsDuplexStatus.1
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OID Breakdown
Upper-level ancestors (7 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.2 | mgmt | AXON-MIB |
| 1.3.6.1.2.1 | mib_2 | AXON-MIB |
| 1.3.6.1.2.1.10 | transmission | CHECKPOINT-MIB-2 |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.2.1.10.7 | dot3 | EtherLike-MIB |
| 1.3.6.1.2.1.10.7.2 | dot3StatsTable | EtherLike-MIB |
| 1.3.6.1.2.1.10.7.2.1 | dot3StatsEntry | EtherLike-MIB |
| 1.3.6.1.2.1.10.7.2.1.19 | dot3StatsDuplexStatus | EtherLike-MIB |