show interfaces (Serial)

Physical interface

Name of the physical interface.

Enabled

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

Interface index

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

SNMP ifIndex

SNMP index number for the physical interface.

Generation

Unique number for use by Juniper Networks technical support only.

Type

Type of interface.

Link-level type

Encapsulation being used on the physical interface.

MTU

Maximum transmission unit (MTU) size on the physical interface.

Maximum speed

Maximum speed. The nonconfigurable value is 16,384 kbps.

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 flags

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

Hold-times

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

Keepalive settings

(PPP and HDLC) Configured settings for keepalive packets.

• Interval seconds—Time between successive keepalive requests. The range of values, in seconds, is 10 to 32,767. The default value is 10.

• Up-count number—Number of keepalive packets a destination must receive to change a link's status from down to up. The range of values is 1 to 255. The default value is 1.

• Down-count number—Number of keepalive packets a destination must fail to receive before the network takes a link down. The range is 1 to 255. The default value is 3.

Keepalive

(PPP and HDLC) Information about keepalive packets.

• Input: number (hh:mm:ss ago)—Number of keepalive packets received by PPP and the time since the last keepalive packet was received.

• Output: number (hh:mm:ss ago)—Number of keepalive packets sent by PPP and the time since the last keepalive packet was sent.

Keepalive statistics

(PPP and HDLC) Information about keepalive packets.

• Input: number (last seen hh:mm:ssago)—Number of keepalive packets received by PPP and the time since the last keepalive packet was received.

• Output: number(last seen hh:mm:ss ago)—Number of keepalive packets sent by PPP and the time since the last keepalive packet was sent.

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.

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.

CHAP state

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

• Chap-Chal-received—Challenge was received but response 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.

• Closed—CHAP authentication is incomplete.

• Failure—CHAP authentication failed.

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

• Success—CHAP authentication was successful.

CoS queues

Number of CoS queues configured.

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).

Input Rate

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

Output Rate

Output rate in bps and pps.

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—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.

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 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

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 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 exceeds the MTU of the interface.

• Resource errors—Sum of transmit drops.

Egress queues supported

Total number of egress queues supported on the specified interface. Displayed with the statistics option.

Egress queues in use

Total number of egress queues in use on the specified interface. Displayed with the statistics option.

Queue counters

CoS queue number and its associated user-configured forwarding class name. Displayed with the statistics option.

• Queued packets—Number of queued packets.

• Transmitted packets—Number of transmitted packets.

• Dropped packets—Number of packets dropped by the ASIC's RED mechanism.

Serial media information

Information about the physical media:

• Line protocol—eia530, eia530a, rs232, rs449, v.35, or x.21..

• Resync history—Information about resynchronization events:

  • Sync loss count—Number of times the synchronization was lost.

• Data signal—(X.21 and V.35) Information about the data signal:

  • Rx Clock—Receive clock status: OK (DTE is receiving the receive clock signal) or Not detected (receive clock signal is not being received).

• Control signals—Information about modem control signals:

  • Local mode:DCE (data communication equipment) or DTE (data terminal equipment)

  • To DCE—Control signals that the Serial PIC sent to the DCE: DTR (Data Terminal Ready:up or down) or RTS (Request To Send: up or down.)

  • From DC—Control signals that the Serial PIC received from the DCE: CTS (Clear To Send: up or down), DCD (Data Carrier Detect: up or down), DSR (Data Set Ready: up or down), or TM (Test Mode: up or down).

• Clocking mode—Clocking used for the transmit clock:

  • dte—Transmit clock is generated by DTE.

  • dce—Transmit clock is generated by the DCE and is looped back as the transmit clock.

  • loop-timed—Receive clock from the DCE is looped back as the transmit clock.

• Clock rate—Rate, in megahertz (MHz), at which the clock is configured.

• Loopback—Configured loopback mode for the interface: dce-remote, dce-local, liu, local, or none.

• Tx clock—Clocking phase of the transmit clock: invert (transmit clock polarity is inverted) or non-invert (transmit clock polarity is not inverted).

• Line encoding—Type of line encoding used: nrz (nonreturn to zero) or nrzi (return to zero inverted).

Packet Forwarding Engine configuration

Information about the configuration of the Packet Forwarding Engine:

• Destination slot—FPC slot number.

• PLP byte—Packet Level Protocol byte.

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.

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-family

Protocol family configured on the logical interface. If the protocol is inet, the source and destination address are also displayed.

Protocol

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

Flags

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

Addresses, Flags

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

Destination

IP address of the remote side of the connection.

Local

IP address of the logical interface.

Broadcast

Broadcast address of the logical interface.

Generation

Unique number for use by Juniper Networks technical support only.