show interfaces (Discard)

Physical interface

Name of the physical interface, whether the interface is enabled, and the state of the physical interface: Up or Down.

Interface index

Physical interface's index number, which reflects its initialization sequence.

Generation

Unique number for use by Juniper Networks technical support only.

SNMP ifIndex

SNMP index number for the physical interface.

Type

Type of interface. Software-Pseudo indicates a standard software interface with no associated hardware device.

Link-level type

Encapsulation being used on the physical interface.

MTU

MTU size on the physical interface.

Clocking

Reference clock source. It can be Internal or External.

Speed

Speed at which the interface is running.

Device flags

Information about the physical device. Possible values are described in the “Device Flags” section under Common Output Fields Description.

Interface flags

Information about the interface. Possible values are described in the “Interface Flags” section under Common Output Fields Description.

Link type

Encapsulation being used on the physical interface.

Link flags

Information about the link. Possible values are described in the “Link Flags” section under Common Output Fields Description.

Physical info

Information about the physical interface.

Hold-times

Current interface hold-time up and hold-time down. Value is in milliseconds.

Current address, Hardware address

Configured MAC address and hardware MAC address.

Alternate link address

Backup address of the link.

Last flapped

Date, time, and how long ago the interface went from down to up. The format is Last flapped: year-month-day hour:minute:second timezone (hour:minute:second ago). For example, Last flapped: 2002-04-26 10:52:40 PDT (04:33:20 ago).

Statistics last cleared

Time when the statistics for the interface were last set to zero.

Traffic statistics

Number and rate of bytes and packets received and transmitted on the physical interface.

• Input bytes, Output bytes—Number of bytes received and transmitted on the interface.

• Input packets, Output packets—Number of packets received and transmitted on the interface.

Input errors

Input errors on the interface:

• Errors—Sum of incoming frame terminated and FCS errors.

• Drops—Number of packets dropped by the input queue of the I/O Manager ASIC. If the interface is saturated, this number increments once for every packet that is dropped by the ASIC's RED mechanism.

• Framing errors—Number of packets received with an invalid frame checksum (FCS).

• Runts—Number of frames received that are smaller than the runt threshold.

• Giants—Number of frames received that are larger than the giant threshold.

• Policed discards—Number of frames that the incoming packet match code discarded because they were not recognized or not of interest. Usually, this field reports protocols that the Junos OS does not handle.

• Resource errors—Sum of transmit drops.

Output errors

(Extensive only) Output errors on the interface. The following paragraphs explain the counters whose meaning might not be obvious:

• Carrier transitions—Number of times the interface has gone from down to up. This number does not normally increment quickly, increasing only when the cable is unplugged, the far-end system is powered down and then up, or another problem occurs. If the number of carrier transitions increments quickly (perhaps once every 10 seconds), the cable, the far-end system, or the PIC is malfunctioning.

• Errors—Sum of the outgoing frame terminated and FCS errors.

• Drops—Number of packets dropped by the output queue of the I/O Manager ASIC. If the interface is saturated, this number increments once for every packet that is dropped by the ASIC's RED mechanism.

• MTU errors—Number of packets whose size exceeded the MTU of the interface.

• Resource errors—Sum of transmit drops.

Logical interface

Name of the logical interface.

Index

Logical interface index number, which reflects its initialization sequence.

SNMP ifIndex

Logical interface SNMP interface index number.

Generation

Unique number for use by Juniper Networks technical support only.

Flags

Information about the logical interface. Possible values are described in the “Logical Interface Flags” section under Common Output Fields Description.

Encapsulation

Encapsulation on the logical interface.

Protocol

Protocol family configured on the logical interface, such as iso, inet6, or mpls.

MTU

MTU size on the logical interface.

Generation

Unique number for use by Juniper Networks technical support only.

Route Table

Routing table in which the logical interface address is located. For example, 0 refers to the routing table inet.0.