# Interface

## Navigation

Port > Configure > Interface

The following information is displayed:

- Name (ifName)

- Description (ifDescr)

- Entity Description (entPhysicalDescr)

- Entity Vendor Type (entPhysicalVendorType)

- Index (ifIndex)

- Speed (ifSpeed)

- Speed

- Duplex Status (dot3StatsDuplexStatus)

- Duplex

- Auto Negotiation (ifMauAutoNegAdminStatus)

- Mtu (ifMtu)

- Physical Address (ifPhysAddress)

- Admin Status (ifAdminStatus)

- Operational Status (ifOperStatus)

- Keep Alive Enabled (cieIfKeepAliveEnabled)

- Last Change (ifLastChange)

- State Change Reason (cieIfStateChangeReason)

- Interface Reset Count (cieIfResetCount)

- Carrier Signal Transition Count (cieIfCarrierTransitionCount)

- Up/Down Traps (ifLinkUpDownTrapEnable)

- Aggregation Protocol (clagAggProtocolType)

- Local Description (ifAlias)

- VLANID (vmVlan)

- VLAN Name (vtpVlanName)

- Voice VLAN Id (vmVoiceVlanId)

- MAC Addr Learnt Notification enabled (cmnMacAddrLearntEnable)

- MAC Addr Removed Notification enabled (cmnMacAddrRemovedEnable)

### Name (ifName)

Textual name of the interface.

### Description (ifDescr)

Textual description of the physical entity. This object contains a string which identifies the manufacturer name, the product name, and the interface hardware/software version.

### Entity Description (entPhysicalDescr)

Textual description of this physical entity. This object should identify the manufacturer of the physical entity and be set to a distinct value for each version or model of the physical entity.

### Entity Vendor Type (entPhysicalVendorType)

Vendor-specific hardware type of the physical entity.

### Index (ifIndex)

A unique value, greater than zero, for each interface.

### Speed (ifSpeed)

An estimate of the interface's current bandwidth, measured in bits per second.

Note the following:

- This dialog box displays ifSpeed as this object's descriptor for only GBIC, SFP, and WS-X4148-FE-LX-MT ports.

- This object is read-only and cannot be modified.

- When ifMauAutoNegAdminStatus is set to Enable, you cannot configure this object.

### Speed

An estimate of the interface's current bandwidth, measured in bits per second.

Note the following:

- For 10/100 and 10/100/1000 megabits (Mbps) cards, this dialog box displays Speed as both the alias and the descriptor for this object.

- You can set this object to either 10 or 100 Mbps for both 10/100 and 10/100/1000 Mbps cards.

- For ports on 10/100/1000 Mbps cards, you can also set this object to 1000 Mbps, provided that full duplex mode is currently active.

- When ifMauAutoNegAdminStatus is set to Enable, you cannot configure this object.

### Duplex Status (dot3StatsDuplexStatus)

Current mode of operation of the MAC entity. There are three possible values: unknown(1), halfDuplex(2), and fullDuplex(3). The value unknown(1) indicates that the current duplex mode cannot be determined.

Note the following:

- This dialog box displays dot3StatsDuplexStatus as this object's descriptor for only GBIC and SFP ports.

- This object is read-only and cannot be modified.

- When ifMauAutoNegAdminStatus is set to Enable, you cannot configure this object.

### Duplex

Current mode of operation of the MAC entity. There are two possible values: Half and Full.

Note the following:

- For ports on 10/100 and 10/100/1000 Mbps cards, this dialog box displays Duplex as both the alias and the descriptor for this object.

- You can set this object to either half or full duplex mode.

- You cannot set this object to half duplex mode if the port speed is 1000 Mbps.

- When ifMauAutoNegAdminStatus is set to Enable, you cannot configure this object.

### Auto Negotiation (ifMauAutoNegAdminStatus)

When set to enabled, the interface with auto-negotiation signaling capability is enabled. When set to disabled, an IEEE 802.3 MAU enters the state indicated by the value of ifMauDefaultType.

### Mtu (ifMtu)

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

### Physical Address (ifPhysAddress)

Address of the interface at its protocol sublayer. The media-specific MIB on the interface must define the bit and byte ordering and format of the value contained by this object.

### Admin Status (ifAdminStatus)

Chosen state for the interface.

Note: For dual port ATM cards (Ws-X 5157, 5158, 5167, 5168, 5156, 5166, 5161, 5162), the cadpStatAdminActivePhy MIB variable is used to perform an active physical switch over.

### Operational Status (ifOperStatus)

Current operational state of the interface.

### Keep Alive Enabled (cieIfKeepAliveEnabled)

A small, Layer 2 message that is transmitted by a network device to let directly-connected network devices know of its presence.

- The value of this object is true(1) if keepalives are enabled on this interface.

- The value of this object is false(2) if keepalives are not enabled on this interface.

### Last Change (ifLastChange)

Value of sysUpTime when 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 value of zero.

### State Change Reason (cieIfStateChangeReason)

Textual string which describes the cause of the last state change of the interface.

Examples of the values this object can take are:

- Lost Carrier

- administratively down

- up

- down

### Interface Reset Count (cieIfResetCount)

Number of times the interface was internally reset and brought up. Some of the actions which can cause this counter to increment are:

- Bringing up an interface using the interface CLI command.

- Clearing the interface using the exec CLI command.

- Bringing the interface up via SNMP.

Discontinuities in the value of this variable can occur at reinitialization of the management system, and at other times as indicated by the values of cieIfInterfaceDiscontinuityTime.

### Carrier Signal Transition Count (cieIfCarrierTransitionCount)

Number of times the interface saw the carrier signal transition.

For example, if a T1 line is unplugged, then the framer will detect the loss of signal (LOS) on the line and count it as a transition.

Discontinuities in the value of this object can occur at reinitialization of the management system, and at other times as indicated by the values of cieIfInterfaceDiscontinuityTime.

### Up/Down Traps (ifLinkUpDownTrapEnable)

Indicates whether a trap is sent to the addresses in the Trap Receiver table every time the port state changes from up to down.

### Aggregation Protocol (clagAggProtocolType)

Aggregation protocol type for this interface. If an aggregation protocol is assigned to any of the ports in a group, then the aggregation protocol is applied to all the ports in that group (a group is a collection of ports which belong to a module or system). On some platforms, the aggregation protocol type can be assigned per aggregator.

### Local Description (ifAlias)

Alias for the interface.

### VLANID (vmVlan)

VLAN ID for the interface.

The VLAN id of the VLAN the port is assigned to when vmVlanType is set to static or dynamic. This object is not instantiated if not applicable.

The value may be 0 if the port is not assigned to a VLAN.

If vmVlanType is static, the port is always assigned to a VLAN and the object may not be set to 0.

If vmVlanType is dynamic the object's value is 0 if the port is currently not assigned to a VLAN. In addition, the object may be set to 0 only

### VLAN Name (vtpVlanName)

VLAN Name for the interface.

The name of this VLAN. This name is used as the ELAN-name for an ATM LAN-Emulation segment of this VLAN

### Voice VLAN Id (vmVoiceVlanId)

The Voice VLAN ID (VVID) to which this port belongs. Valid values range from zero to 4096, as described below:

- 0—CDP packets transmitting through this port contain an Appliance VLAN-ID TLV with a value of zero. VoIP and related packets are both sent and received with a VLAN-ID of zero and an 802.1p priority.

- 1 through 4094—CDP packets transmitting through this port contain an Appliance VLAN-ID TLV with a value of N (where N equals the VVID specifed by this object). VoIP and related packets are both sent and received with a VLAN-ID of N and an 802.1p priority.

- 4095—CDP packets transmitting through this port contain an Appliance VLAN-ID TLV with a value of 4095. VoIP and related packets are both sent and received untagged without an 802.1p priority set.

- 4096—CDP packets transmitting through this port do not contain an Appliance VLAN-ID TLV. Or, if this VVID is not supported by the port, then this MIB object cannot be configured and returns a value of 4096.

### MAC Addr Learnt Notification enabled (cmnMacAddrLearntEnable)

When this object is set to true(1), this interface is enabled to send a cmnMacChangedNotification each time it learns of a new MAC address.

Note: This object is available only when the value of cmnGlobalFeatureEnabled is true(1).

### MAC Addr Removed Notification enabled (cmnMacAddrRemovedEnable)

When this object is set to true(1), this interface is enabled to send a cmnMacChangedNotification each time a previously learned MAC address is removed from the forwarding table.

Note: This object is available only when the value of cmnGlobalFeatureEnabled is true(1).