show interfaces (J-series Management Ethernet)

Physical interface

Name of the physical interface.

All levels

Link

Status of the link: up or down.

All levels

Enabled

State of the interface. Possible values are described in Enabled Field.

All levels

Interface index

Physical interface index number, which reflects its initialization sequence.

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SNMP ifIndex

SNMP index number for the physical interface.

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Generation

Unique number for use by Juniper Networks technical support only.

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Description

Description and name of the interface.

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Link-level type

Encapsulation type used on the physical interface.

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MTU

Maximum transmission unit (MTU). Size of the largest packet to be transmitted.

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Speed

Network speed on the interface.

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Loopback

Whether loopback is enabled and the type of loopback (either local or remote).

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Source filtering

Whether source filtering is configured.

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Flow control

Whether flow control is enabled or disabled.

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Device flags

Information about the physical device. Possible values are described in Device Flags.

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Interface flags

Information about the interface. Possible values are described in Interface Flags.

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Link flags

Information about the link. Possible values are described in Link Flags.

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CoS queues

Number of CoS queues supported on this interface.

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Hold-times

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

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Current address

Configured MAC address.

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Hardware address

Media access control (MAC) address of the interface.

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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).

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Statistics last cleared

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

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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.

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Input errors

• Errors—Input errors on the interface.
• Drops—Number of packets dropped by the output queue of the I/O Manager ASIC.
• Framing errors—Number of packets received with an invalid frame checksum (FCS).
• Runts—Frames received smaller than the runt threshold.
• Policed Discards—Frames that the incoming packet match code discarded because the frames did not recognize them or were not of interest. Usually, this field reports protocols that JUNOS does not support.
• L3 incompletes—Number of incoming packets discarded because they failed Layer 3 (usually IPv4) sanity checks of the header. For example, a frame with less than 20 bytes of available IP header is discarded.
• L2 channel errors—Number of times the software could not find a valid logical interface for an incoming frame.
• L2 mismatch timeouts—Number of malformed or short packets that cause the incoming packet handler to discard the frame as unreadable.
• FIFO errors—Number of FIFO errors in the receive direction as reported by the ASIC on the PIM. If this value is ever nonzero, the PIM is probably malfunctioning.
• Resource errors—Sum of transmit drops.

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Output errors

• 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, possibly once every 10 seconds, the cable, the remote system, or the interface is malfunctioning.
• Errors—Sum of outgoing frame aborts 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 dropped by the ASIC RED mechanism.
• Collisions—Number of Ethernet collisions.
• Aged packets—Number of packets that remained in shared packet SDRAM so long that the system automatically purged them. The value in this field should never increment. If it does, it is most likely a software bug or possibly malfunctioning hardware.
• HS link CRC errors—Number of errors on the high-speed links between the ASICs responsible for handling the router interfaces.
• FIFO errors—Number of FIFO errors in the receive direction as reported by the ASIC on the PIM. If this value is ever nonzero, the PIM is probably malfunctioning.
• MTU errors—Number of packets larger than the MTU threshold.
• Resource errors—Sum of transmit drops.

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Queue counters

CoS queue number and its associated user-configured forwarding class name.

• Queued packets—Number of queued packets.
• Transmitted packets—Number of transmitted packets.
• Dropped packets—Number of packets dropped by the ASIC's RED mechanism.

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Active alarms and Active defects

Ethernet-specific defects that can prevent the interface from passing packets. When a defect persists for a certain period, it is promoted to an alarm. Based on the router configuration, an alarm can ring the red or yellow alarm bell on the router, or turn on the red or yellow alarm LED on the craft interface. These fields can contain the value None or Link.

• None—There are no active defects or alarms.
• Link—Interface has lost its link state, which usually means that the cable is unplugged, the far-end system has been turned off, or the PIM is malfunctioning.

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MAC statistics

Statistics reported by the PIM's MAC subsystem, including the following:

• Total octets and total packets —Total number of sent and received octets and packets.
• Unicast, broadcast, and multicast packets—Number of unicast, broadcast, and multicast packets.
• CRC/Align errors—Total number of packets received that had a length (excluding framing bits, but including FCS octets) of between 64 and 1518 octets, inclusive, but had either a bad FCS with an integral number of octets (FCS error) or a bad FCS with a nonintegral number of octets (alignment error).
• FIFO errors—Number of FIFO errors that are reported by the ASIC on the PIM. If this value is ever nonzero, the PIC is probably malfunctioning.
• MAC control frames—Number of MAC control frames.
• MAC pause frames—Number of MAC control frames with pause operational code.
• Oversized frames—Number of frames that exceed the MTU.
• Jabber frames—Number of packets received that were longer than 1518 octets (excluding framing bits, but including FCS octets), and had either an FCS error or an alignment error. This definition of jabber is different from the definition in IEEE-802.3 section 8.2.1.5 (10Base5) and section 10.3.1.4 (10Base2). These documents define jabber as the condition in which any packet exceeds 20 ms. The allowed range to detect jabber is between 20 ms and 150 ms.
• Fragment frames—Total number of packets received that were less than 64 octets (excluding framing bits, but including FCS octets), and had either an FCS error or an alignment error. Fragment frames normally increment because both runts (which are normal occurrences caused by collisions) and noise hits are counted.
• VLAN tagged frames—Number of frames that are VLAN tagged. The system uses the TPID of 0x8100 in the frame to determine whether a frame is tagged or not.
• Code violations—Number of times an event caused the PHY to indicate “Data reception error”or “invalid data symbol error”.

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Filter statistics

Statistics reported by the PIM's MAC address filter subsystem. The filtering is done by the content-addressable memory (CAM) on the PIM. The filter examines a packet's source and destination MAC addresses to determine whether the packet should enter the system or be rejected.

• Input packet count—Number of packets received from the MAC hardware that the filter processed.
• Input packet rejects—Number of packets that the filter rejected because of either the source MAC address or the destination MAC address.
• Input DA rejects—Number of packets that the filter rejected because the destination MAC address of the packet is not on the accept list. It is normal for this value to increment. When it increments very quickly and no traffic is entering the router from the far-end system, either a bad ARP entry exists on the far-end system, or multicast routing is not on and the far-end system is sending many multicast packets to the local router (which the router is rejecting).
• Input SA rejects—Number of packets that the filter rejected because the source MAC address of the packet is not on the accept list. The value in this field should increment only if source MAC address filtering has been enabled. If filtering is enabled, if the value increments quickly, and if the system is not receiving traffic that it should from the far-end system, it means that the user-configured source MAC addresses for this interface are incorrect.
• Output packet count—Number of packets that the filter has given to the MAC hardware.
• Output packet pad count—Number of packets the filter padded to the minimum Ethernet size (60 bytes) before giving the packet to the MAC hardware. Usually, padding is done only on small ARP packets, but some very small IP packets can also require padding. If this value increments rapidly, either the system is trying to find an ARP entry for a far-end system that does not exist or it is misconfigured.
• Output packet error count—Number of packets with an indicated error that the filter was given to transmit. These packets are usually aged packets or are the result of a bandwidth problem. On a normal system, the value of this field should not increment.
• CAM destination filters, CAM source filters—Number of entries in the CAM dedicated to destination and source MAC address filters. There can only be up to 64 source entries. If source filtering is disabled, which is the default, the values for these fields should be 0.

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Autonegotiation information

Information about link autonegotiation.

• Negotiation status:
  • Incomplete—Ethernet interface has the speed or link mode configured.
  • No autonegotiation—Remote Ethernet interface has the speed or link mode configured, or does not perform autonegotiation.
  • Complete—Ethernet interface is connected to a device that performs autonegotiation and the autonegotiation process is successful.
• Link partner status—OK when the Ethernet interface is connected to a device that performs autonegotiation and the autonegotiation process is successful.
• Link partner—Depending on the capability of the attached Ethernet device, either Full-duplex or Half-duplex.
• Flow control—Types of flow control supported by the remote Ethernet device.

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Packet Forwarding Engine configuration

Information about the configuration of the Packet Forwarding Engine:

• Destination slot—FPC slot number.
• CoS transmit queue—Queue number and its associated user-configured forwarding class name.
  • bandwidth %—Percentage of bandwidth allocated to the queue.
  • Bandwidth bps—Bandwidth allocated to the queue (in bps).
  • buffer %—Percentage of buffer space allocated to the queue.
  • Buffer usec—Amount of buffer space allocated to the queue, in microseconds. This value is nonzero only if the buffer size is configured in terms of time.
  • Priority—Queue priority: low or high.
  • Limit—Displayed if rate limiting is configured for the queue. Possible values are none and exact. If exact is configured, the queue transmits only up to the configured bandwidth, even if excess bandwidth is available. If none is configured, the queue transmits beyond the configured bandwidth if bandwidth is available.

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Logical interface

Name of the logical interface.

All levels

Index

Logical interface index number, which reflects its initialization sequence.

All levels

SNMP ifIndex

Logical interface SNMP interface index number.

All levels

Generation

Unique number for use by Juniper Networks technical support only.

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Description

Description and name of the interface.

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Flags

Information about the logical interface; values are described in Logical Interface Flags.

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Encapsulation

Encapsulation on the logical interface.

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Traffic statistics

Total number of bytes and packets received and transmitted on the logical interface. These statistics are the sum of the local and transit statistics. When a burst of traffic is received, the value in the output packet rate field might briefly exceed the peak cell rate. It takes awhile (generally, less than 1 second) for this counter to stabilize.

• 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.

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Protocol

Protocol family configured on the logical interface (such as iso or inet6).

All levels

MTU

MTU size on the logical interface.

All levels

Generation

Unique number for use by Juniper Networks technical support only.

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Route Table

Route table in which this address exists. for example, Route table:0 refers to inet.0.

All levels

Flags

Information about the protocol family flags. Possible values are described in Family Flags.

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Addresses, Flags

Information about address flags. Possible values are described in Addresses, Flags.

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Destination

IP address of the remote side of the connection.

All levels

Local

IP address of the logical interface.

All levels

Broadcast

Broadcast address.

All levels

Generation

Unique number for use by Juniper Networks technical support only.

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