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show interfaces (T1, E1, or DS)

 

Syntax

Release Information

Command introduced before Junos OS Release 7.4.

Description

Display status information about the specified T1, E1, or DS interface.

Options

interface-typeOn ACX Series, M Series, MX Series, and T Series routers, the T1 interface type is t1-fpc/pic/port, whereas the E1 interface type is e1-fpc/pic/port, and DS interface type is ds-fpc/pic/port:<channel>.
brief | detail | extensive | terse(Optional) Display the specified level of output.
descriptions(Optional) Display interface description strings.
media(Optional) Display media-specific information about network interfaces.
snmp-index snmp-index(Optional) Display information for the specified SNMP index of the interface.
statistics(Optional) Display static interface statistics.

Required Privilege Level

view

List of Sample Output

show interfaces (T1, IMA Link)

show interfaces (T1, PPP)

show interfaces detail (T1, PPP)

show interfaces extensive (T1 CRC Errors)

show interfaces extensive (T1, PPP)

show interfaces (E1, Frame Relay)

show interfaces detail (E1, Frame Relay)

show interfaces extensive (E1, Frame Relay)

show interfaces (E1, IMA Link)

show interfaces extensive (T1, TDM-CCC-SATOP)

show interfaces extensive (DS, TDM-CCC-CESoPSN)

Output Fields

Table 1 lists the output fields for the show interfaces (T1 or E1) command. Output fields are listed in the approximate order in which they appear.

Table 1: T1 or E1 show interfaces Output Fields

Field Name

Field Description

Level of Output

Physical Interface 

Physical interface

Name of the physical interface.

All levels

Enabled

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

All levels

Interface index

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

detail extensive none

SNMP ifIndex

SNMP index number for the physical interface.

detail extensive none

Generation

Unique number for use by Juniper Networks technical support only.

detail extensive

Link-level type

Encapsulation being used on the physical interface.

All levels

MTU

MTU size on the physical interface.

All levels

Clocking

Reference clock source: Internal or External.

All levels

Speed

Speed at which the interface is running.

All levels

Loopback

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

All levels

FCS

Frame check sequence on the interface (either 16 or 32). The default is 16 bits.

All levels

Framing

Physical layer framing format used for the E1 interface on the link: G704, G704-NO-CRC4, or Unframed. The default is G704.

Physical layer framing format used for the T1 interface on the link: SF and ESF. The default is ESF.

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

Interface flags

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

Hold-times

Current interface hold-time up and hold-time down, in milliseconds.

detail extensive

IMA Link alarms

Current active IMA link alarms, including the following:

  • LIF

  • LODS

  • RFI-IMA

  • Tx-Mis-Connected

  • Tx-Unusable-FE

  • Rx-Unusable-FE

  • Link Fault

detail extensive none

IMA Link defects

Current active IMA link defects, including the following:

  • LIF

  • LODS

  • RFI-IMA

  • Tx-Mis-Connected

  • Tx-Unusable-FE

  • Rx-Unusable-FE

  • Link Fault

detail extensive none

IMA Link state

Current active IMA link status, including the following:

  • Line: synchronized or not synchronized

  • Near end:—Status of near-end receive and transmit links

    • Rx: Usable or Unusable

    • Tx: Usable or Unusable

  • Far end:—Status of far-end receive and transmit links

    • Rx: Usable or Unusable

    • Tx: Usable or Unusable

detail extensive none

IMA link media

IMA Link Media Status, which provides the seconds and count state for the following link media parameters:

  • LIF

  • LODS

  • Err-ICP

  • IV

  • Rx-FC

  • Tx-FC

  • FE-Defects

  • FE-Rx-FC

  • FE-Tx-FC

  • Rx-ICP

  • Rx-Stuff

  • Tx-ICP

  • Tx-Stuff

  • Rx-SES

  • Rx-UAS

  • Rx-UUS

  • Tx-UUS

  • FE-Rx-SES

  • FE-Rx-UAS

  • FE-Rx-UUS

  • FE-Tx-UUS

detail extensive none

Keepalive settings

(PPP and HDLC) Configured settings for keepalives.

  • interval seconds—The 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—The 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—The 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.

detail extensive none

Keepalive statistics

(PPP and HDLC) Information about keepalive packets. (When no level of output is specified, the word statistics is not part of the field name and the last seen text is not displayed.)

  • Input—Number of keepalive packets received by PPP.

    • (last seen 00:00:00 ago)—Time since the last keepalive packet was received, in the format hh:mm:ss.

  • Output—Number of keepalive packets sent by PPP and how long ago the last keepalive packets were sent and received.

    • (last seen 00:00:00 ago)—Time since the last keepalive packet was sent, in the format hh:mm:ss.

detail extensive none

LMI settings

(Frame Relay) Settings for Local Management Interface (LMI) which 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)

detail extensive none

LMI

(Frame Relay) Local Management Interface (LMI) packet statistics:

  • Input—Number of packets coming in on the interface (nn) and how much time has passed since the last packet arrived. The format is Input: nn (last seen hh:mm:ss ago).

  • Output—Number of packets sent out on the interface (nn) and how much time has passed since the last packet was sent. The format is Output: nn (last sent hh:mm:ss ago).

detail extensive none

DTE statistics

(Frame Relay) Statistics about messages transmitted from the data terminal equipment (DTE) to the data communications 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.

detail extensive none

DCE statistics

(Frame Relay) Statistics about messages transmitted from the DCE to the DTE:

  • Enquiries received—Number of enquiries received by the DCE from the DTE.

  • Full enquiries received—Number of full enquiries received by the DCE from the DTE.

  • Enquiry responses sent—Number of enquiry responses sent from the DCE to the DTE.

  • Full enquiry responses sent—Number of full enquiry responses sent from the DCE to the DTE.

detail extensive none

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 Local Management Interface (LMI) packet was reported for n392dte or n393dce intervals. (See LMI settings.)

detail extensive none

Nonmatching DCE-end DLCIs

(Frame Relay. Displayed only from the DTE.) Number of DLCIs configured from the DCE.

detail extensive none

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.

detail extensive none

NCP state

(PPP) Network Control Protocol state.

  • Conf-ack-received—Acknowledgement was received.

  • Conf-ack-sent—Acknowledgement was sent.

  • Conf-req-sent—Request was sent.

  • Down—NCP negotiation is incomplete (not yet completed or has failed).

  • Not configured—NCP is not configured on the interface.

  • Opened—NCP negotiation is successful.

detail extensive none

CHAP state

(PPP) State of the Challenge Handshake Authentication Protocol (CHAP) during its transaction.

  • Chap-Chal-received—Challenge was received but response is not yet sent.

  • Chap-Chal-sent—Challenge was sent.

  • Chap-Resp-received—Response was received for the challenge sent, but CHAP has not yet moved into the Success state. (Most likely with RADIUS authentication.)

  • Chap-Resp-sent—Response was sent for the challenge received.

  • Down—CHAP authentication is incomplete (not yet completed or has failed).

  • Not-configured—CHAP is not configured on the interface.

  • Opened—CHAP authentication was successful.

detail extensive none

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).

detail extensive none

CoS Queues

Number of CoS queues configured.

detail extensive none

Input rate

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

None specified

Output rate

Output rate in bps and pps.

None specified

Statistics last cleared

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

detail extensive

Traffic statistics

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

detail extensive

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).

  • 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.

  • SRAM errors—Number of hardware errors that occurred in the static RAM (SRAM) on the PIC or PIM. If the value of this field increments, the PIC or PIM is malfunctioning.

  • Resource errors—Sum of transmit drops.

extensive

Output errors

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 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 or PIM is malfunctioning.

  • Errors—Sum of the 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 that is dropped by the ASIC's RED mechanism.

  • 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.

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

  • Resource errors—Sum of transmit drops.

extensive

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.

detail extensive

DS1 alarms

DS1 defects

E1 media-specific defects that can prevent the interface from passing 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.

  • AIS—Alarm indication signal.

  • LOF—Loss of frame.

  • LOS—Loss of signal.

  • YLW—Yellow alarm. Indicates errors at the remote site receiver.

detail extensive none

T1 media or E1 media

Counts of T1 or E1 media-specific errors.

  • Seconds—Number of seconds the defect has been active.

  • Count—Number of times that the defect has gone from inactive to active.

  • State—State of the error. State other than OK indicates a problem.

    The T1 or E1 media-specific error types are:

  • SEF—Severely errored framing

  • BEE—Bit error

  • AIS—Alarm indication signal

  • LOF—Loss of frame

  • LOS—Loss of signal

  • YELLOW—Errors at the remote site receiver

  • CRC Major—Cyclic redundancy check major alarm threshold exceeded

  • CRC Minor—Cyclic redundancy check minor alarm threshold exceeded

  • BPV—Bipolar violation

  • EXZ—Excessive zeros

  • LCV—Line code violation

  • PCV—Pulse code violation

  • CS—Carrier state

  • CRC—Cyclic redundancy check

  • FEBE—Far-end block error (E1 only)

  • LES—Line error seconds

  • ES—Errored seconds

  • BES—Bursty errored seconds

  • SES—Severely errored seconds

  • SEFS—Severely errored framing seconds

  • UAS—Unavailable seconds

extensive

SAToP Configuration

Information about the SAToP configuration.

  • payload-size—Configure the payload size, in bytes (from 32 through 1024 bytes).

  • idle-pattern—An 8-bit hexadecimal pattern to replace TDM data in a lost packet (from 0 through 255).

  • jitter-buffer-packets—Number of packets in the jitter buffer (from 1 through 64 packets).

  • jitter-buffer-latency—Time delay in the jitter buffer (from 1 through 1000 milliseconds).

  • excessive-packet-loss-rate—Set packet loss options. The options are groups, sample-period, and threshold.

  • sample-period—Time required to calculate excessive packet loss rate (from 1000 through 65,535 milliseconds).

  • threshold—Percentile designating the threshold of excessive packet loss rate (1–100 percent).

extensive

CESoPSN Configuration

Information about the CESoPSN configuration.

  • packetization-latency—Time required to create packets (from 1000 through 8000 microseconds).

  • idle-pattern—An 8-bit hexadecimal pattern to replace TDM data in a lost packet (from 0 through 255).

  • jitter-buffer-packets—Number of packets in the jitter buffer (from 1 through 64 packets).

  • jitter-buffer-latency—Time delay in the jitter buffer (from 1 through 1000 milliseconds).

  • excessive-packet-loss-rate—Set packet loss options. The options are sample-period and threshold.

  • sample-period—Time required to calculate excessive packet loss rate (from 1000 through 65,535 milliseconds).

  • threshold—Percentile designating the threshold of excessive packet loss rate (1–100 percent).

extensive

HDLC configuration

Information about the HDLC configuration.

  • Policing bucket—Configured state of the receiving policer.

  • Shaping bucket—Configured state of the transmitting shaper.

  • Giant threshold—Giant threshold programmed into the hardware.

  • Runt threshold—Runt threshold programmed into the hardware.

  • Timeslots—Time slots configured on the interface.

  • Buildout—(T1 only) Buildout setting: 0-132, 133-265, 266-398, 399-531, or 532-655 feet.

  • Timeslots—Configured time slots for the interface.

  • Byte encoding—(T1 only) Byte encoding used: Nx64K or Nx56K.

  • Line encoding—Line encoding used. For T1, the value can be B8ZS or AMI. For E1, the value is HDB3.

  • Data inversion—HDLC data inversion setting: Enabled or Disabled.

  • Idle cycle flag—Idle cycle flags.

  • Start end flag—Start and end flag.

extensive

DS1 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.

detail extensive none

Packet Forwarding Engine configuration

Information about the configuration of the Packet Forwarding Engine:

  • Destination slot—FPC slot number.

  • PLP byte—Packet Level Protocol byte.

extensive

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.

extensive

   
Logical Interface 

Logical interface

Name of the logical interface.

All levels

Index

Logical interface index number, which reflects its initialization sequence.

detail extensive none

SNMP ifIndex

Logical interface SNMP interface index number.

detail extensive none

Generation

Unique number for use by Juniper Networks technical support only.

detail extensive

Flags

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

All levels

Encapsulation

Encapsulation on the logical interface.

All levels

Input packets

Number of packets received on the logical interface.

None specified

Output packets

Number of packets transmitted on the logical interface.

None specified

Traffic statistics

(Frame Relay) 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.

detail extensive

Local statistics

(Frame Relay) Statistics for traffic received from and transmitted to the Routing Engine. When a burst of traffic is received, the value in the output packet rate field might briefly exceed the peak cell rate. It takes a while (generally, less than 1 second) for this counter to stabilize.

detail extensive

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. This counter normally stabilizes in less than 1 second.

detail extensive

Protocol

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

detail extensive none

Multilink bundle

Interface name for the multilink bundle, if configured.

detail extensive none

MTU

MTU size on the logical interface.

detail extensive none

Generation

Unique number for use by Juniper Networks technical support only.

detail extensive

Route table

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

detail extensive

Flags

Information about the protocol family flags. Possible values are described in the “Family Flags” section under Common Output Fields Description.

detail extensive none

Addresses, Flags

Information about the address flags. Possible values are described in the “Addresses Flags” section under Common Output Fields Description.

detail extensive none

Destination

IP address of the remote side of the connection.

detail extensive none

Local

IP address of the logical interface.

detail extensive none

Broadcast

Broadcast address.

detail extensive none

Generation

Unique number for use by Juniper Networks technical support only.

detail extensive none

DLCI

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

  • Active—Set when the link is active and the DTE and DCE are exchanging information.

  • Down—Set when the link is active, but no information is received from the DCE.

  • 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.

detail extensive none

DLCI statistics

(Frame Relay) Data-link connection identifier (DLCI) statistics.

  • Active DLCI—Number of active DLCIs.

  • Inactive DLCI—Number of inactive DLCIs.

detail extensive none

CE Info

Information related to the circuit emulation statistics.

  • CE Tx—Number of transmitted packets and bytes (TDM to PSN flow).

  • CE Rx—Number of received packets and bytes and forward bytes (PSN to TDM flow).

  • CE Rx Forwarded—Number of forwarded bytes.

  • CE Strayed—Number of stray packets.

  • CE Lost—Number of lost packets.

  • CE Malformed—Number of malformed packets

  • CE Misinserted—Number of misinserted packets.

  • CE AIS dropped—Number of dropped bytes due to buffer overrun (PSN to TDM).

  • CE Dropped—Number of dropped packets during resynchronization

  • CE Overrun Events—Number of overrun events.

  • CE Underrun Events—Number of underrun events.

extensive

Sample Output

show interfaces (T1, IMA Link)

user@host> show interfaces t1-1/0/0

show interfaces (T1, PPP)

user@host> show interfaces t1-1/1/0

show interfaces detail (T1, PPP)

user@host> show interfaces t1-1/1/0 detail

show interfaces extensive (T1 CRC Errors)

user@host> show interfaces t1-3/2/0:1:1 extensive

show interfaces extensive (T1, PPP)

user@host> show interfaces t1-1/1/0 extensive

show interfaces (E1, Frame Relay)

user@host> show interfaces e1-3/0/0

show interfaces detail (E1, Frame Relay)

user@host> show interfaces e1-3/0/0 detail

show interfaces extensive (E1, Frame Relay)

user@host> show interfaces e1-3/0/0 extensive

show interfaces (E1, IMA Link)

user@host> show interfaces e1-1/0/0

show interfaces extensive (T1, TDM-CCC-SATOP)

user@host> show interfaces t1-1/0/0:1:1 extensive

show interfaces extensive (DS, TDM-CCC-CESoPSN)

user@host> show interfaces ds-1/0/0:1:1:1 extensive