Enabled

State of the interface. Possible values are described in the “Enabled Field” section under Common Output Fields Description.

All levels

SNMP ifIndex

SNMP index number for the physical interface.

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Link-level type

Encapsulation being used on the physical interface.

All levels

Clocking

Reference clock source: Internal or External.

All levels

Loopback

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

All levels

Framing

Physical layer framing format used on the link. It can be G704, G704-NO-CRC4, or Unframed. The default is G704.

All levels

Device flags

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

All levels

Link flags

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

All levels

Keepalive settings

(PPP and HDLC) Configured settings for keepalives.

• Interval seconds—Time in seconds between successive keepalive requests. The range is 10  seconds through 32,767 seconds, with a default of 10 seconds.
• Down-count number—Number of keepalive packets a destination must fail to receive before the network takes a link down. The range is 1 through 255, with a default of 3.
• Up-count number—Number of keepalive packets a destination must receive to change a link's status from down to up. The range is 1 through 255, with a default of 1.

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LMI settings

(Frame Relay) Settings for link management can be either ANSI LMI settings or ITU LMI settings. ANSI LMI settings is the default. The format is (ANSI or ITU) LMI settings: value, value... xx seconds, where value can be:

• n391dte—DTE full status polling interval (1–255)
• n392dce—DCE error threshold (1–10)
• n392dte—DTE error threshold (1–10)
• n393dce—DCE monitored event count (1–10)
• n393dte—DTE monitored event count (1–10)
• t391dte—DTE polling timer (5–30 seconds)
• t392dce—DCE polling verification timer (5–30 seconds)

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DTE statistics

(Frame Relay) Statistics about messages transmitted from the data terminal equipment (DTE) to the data circuit-terminating equipment (DCE):

• Enquiries sent—Number of link status enquiries sent from the DTE to the DCE.
• Full enquiries sent—Number of full enquiries sent from the DTE to the DCE.
• Enquiry responses received—Number of enquiry responses received by the DTE from the DCE.
• Full enquiry responses received—Number of full enquiry responses sent from the DTE to the DCE.

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Common statistics

(Frame Relay) Statistics about messages sent between the DTE and the DCE:

• Unknown messages received—Number of received packets that do not fall into any category.
• Asynchronous updates received—Number of link status peer changes received.
• Out-of-sequence packets received—Number of packets for which the sequence of the packets received is different from the expected sequence.
• Keepalive responses timedout—Number of keepalive responses that timed out when no LMI packet was reported forn392dte or n393dce intervals. (See LMI settings).

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LCP state

(PPP) Link Control Protocol state.

• Conf-ack-received—Acknowledgement was received.
• Conf-ack-sent—Acknowledgement was sent.
• Conf-req-sent—Request was sent.
• Down—LCP negotiation is incomplete (not yet completed or has failed).
• Not-configured—LCP is not configured on the interface.
• Opened—LCP negotiation is successful.

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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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Input Rate

Input rate in bits per second (bps) and packets per second (pps).

None specified

Statistics last cleared

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

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Input errors

Input errors on the interface. The following paragraphs explain the counters whose meaning might not be obvious:

• Errors—Sum of the incoming frame aborts 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).
• Giants—Number of frames received that are larger than the giant threshold.
• Runts—Number of frames received that are smaller than the runt 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.
• 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 did not find a valid logical interface for an incoming frame.
• L2 mismatch timeouts—Number of malformed or short packets that caused the incoming packet handler to discard the frame as unreadable.
• HS link CRC errors—Number of errors on the high-speed links between the ASICs responsible for handling the router interfaces.
• Resource errors—Sum of transmit drops.

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DS1 alarms

DS1 defects

E1 media-specific defects that can render the interface unable to pass packets. When a defect persists for a certain amount of time, 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. The following lists all possible alarms and defects. For complete explanations of most of these alarms and defects, see Bellcore Telcordia GR-499-CORE.

• LOS—Loss of signal.
• LOF—Loss of frame.
• AIS—Alarm indication signal.
• YLW—Yellow alarm. Indicates errors at the remote site receiver.

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HDLC configuration

Information about the HDLC configuration.

• Giant threshold—Giant threshold programmed into the hardware.
• Runt threshold—Runt threshold programmed into the hardware.
• Timeslots—Configured time slots for the interface.
• Line encodingHDB3—Line encoding used.

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DSx BERT configuration

BERT (bit error rate test) checks the quality of the line. This output appears only when a BERT is run on the interface.

• BERT time period—Configured total time period that the BERT is to run.
• Elapsed—Actual time elapsed since the start of the BERT (in seconds).
• Induced error rate—Configured rate at which the bit errors are induced in the BERT pattern.
• Algorithm—Type of algorithm selected for the BERT.

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CoS information

Information about the CoS queue for the physical interface.

• 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

SNMP ifIndex

Logical interface SNMP interface index number.

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Flags

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

All levels

Input packets

Number of packets received on the logical interface.

None specified

Traffic statistics

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

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

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Transit statistics

(Frame Relay) Statistics for traffic transiting the router. 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.

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Multilink bundle

(Multilink) Interface name for the multilink bundle, if configured.

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Generation

Unique number for use by Juniper Networks technical support only.

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DLCI

(Frame Relay) DLCI number of the logical interface. The following DLCI information is displayed: Flags, Total down time, Last down, and Traffic statistics. Flags is one or more of the following:

• Active—Set when the link is active and the DTE and DCE are exchanging information.
• Down—Set when link is active, but no information is received from the DCE.
• Unconfigured—Set when the corresponding DLCI in the DCE is not configured.
• Configured—Set when the corresponding DLCI in the DCE is configured.
• Dce-configured—Displayed when the command is issued from the DTE.

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