Interface (G)

The Interfaces table contains information on the entity's interfaces. The (G) indicates that graphs are available. Each interface is thought of as being attached to a subnetwork. Note that this term should not be confused with subnet that refers to an addressing partitioning scheme used in the Internet suite of protocols.

The Interfaces Table has two subtables:

·         Traffic/Errors in

·         Traffic/Errors out

Figure 80. SNMP Browser: Interfaces Table

You may also graph many of the fields on the Interfaces table. For example, in the following figure Octets In/Octets Out and Discards In/Discards Out are graphed:

Figure 81. SNMP Browser: Interfaces Table Graph

The fields on the Interfaces Table for the selected IP are:

Index

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.

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.

Type

The type of interface, distinguished according to the physical/link protocol(s) immediately “below” the network layer in the protocol stack.

MTU

The size of the largest datagram that can be sent/received on the interface specified in octets. For interfaces that are used for transmitting network datagrams, this is the size of the largest network datagram that can be sent on the interface.

Speed

An estimate of the interface's current bandwidth in bits per second. For interfaces that do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth.

AdminStatus

Administrative Status. The desired state of the interface. The testing (3) state indicates that no operational packets can be passed.

OperStatus

Operational Status. The current operational state of the interface. The testing (3) state indicates that no operational packets can be passed.

LastChange

The value of sysUpTime at the time the interface entered its current operational state. If the current state was entered prior to the last reinitialization of the local network management subsystem, then this object contains a zero value.

 

TRAFFIC/
ERRORS IN subtable

 

Index

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.

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.

InOctets

The total number of octets received on the interface, including framing characters.

InUCastPackets

The number of subnetwork-unicast packets delivered to a higher-layer protocol.

In NUCastPackets

The number of non-unicast (i.e., subnetwork-broadcast or subnetwork-multicast) packets delivered to a higher-layer protocol.

InDiscards

The number of non-unicast (i.e., subnetwork-broadcast or subnetwork-multicast) packets delivered to a higher-layer protocol.

InErrors

The number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.

UnkProtos

The number of packets received via the interface that were discarded because of an unknown or unsupported protocol.

 

See also: