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Juniper Show Interface Commands
show interfaces
Sample Output
user@host> show interfaces t3-5/2/0
Physical interface: t3-5/2/0, Enabled, Physical link is Up
Interface index: 30, SNMP ifIndex: 41
Link-level type: Frame-Relay, MTU: 4474, Clocking: Internal
Speed: T3, Loopback: None, CRC: 16, Mode: C/Bit parity
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : No-Keepalives, DCE
Input rate : 35784 bps (1 pps), Output rate: 35792 bps (1 pps)
Active alarms : None
Active defects : None
Logical interface t3-5/2/0.0 (Index 11) (SNMP ifIndex 42)
Flags: Point-To-Point SNMP-Traps, DLCI 10, Encapsulation: FR-NLPID
Input packets: 54 Output packets: 54
Protocol inet, MTU: 4470
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.2.200, Local: 192.168.2.225
Protocol iso, MTU: 4470
Logical interface t3-5/2/0.1 (Index 12) (SNMP ifIndex 52)
...
show interfaces detail (for T3 Interfaces)
Sample Output
user@host> show interfaces t3-5/2/0 detail
Physical interface: t3-5/2/0, Enabled, Physical link is Up
Interface index: 30, SNMP ifIndex: 41
Link-level type: Frame-Relay, MTU: 4474, Clocking: Internal
Speed: T3, Loopback: None, CRC: 16, Mode: C/Bit parity
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : No-Keepalives, DCE
Statistics last cleared: Never
Traffic statistics:
Input bytes : 232855 0 bps
Output bytes : 232914 0 bps
Input packets: 59 0 pps
Output packets: 59 0 pps
Active alarms : None
Active defects : None
Logical interface t3-5/2/0.0 (Index 11) (SNMP ifIndex 42)
Flags: Point-To-Point SNMP-Traps, DLCI 10, Encapsulation: FR-NLPID
Traffic statistics:
Input bytes : 233032
Output bytes : 233032
Input packets: 59
Output packets: 59
Local statistics:
Input bytes : 233032
Output bytes : 233032
Input packets: 59
Output packets: 59
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Protocol inet, MTU: 4470, Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.2.200, Local: 192.168.2.225, Broadcast:Unspecified
Protocol iso, MTU: 4470, Flags: None
Logical interface t3-5/2/0.1 (Index 12) (SNMP ifIndex 52)
...
show interfaces extensive (for T3 Interfaces)
Sample Output
user@host> show interfaces t3-5/2/0 extensive
Physical interface: t3-5/2/0, Enabled, Physical link is Up
Interface index: 30, SNMP ifIndex: 41
Link-level type: Frame-Relay, MTU: 4474, Clocking: Internal
Speed: T3, Loopback: None, CRC: 16, Mode: C/Bit parity
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : No-Keepalives, DCE
Statistics last cleared: Never
Traffic statistics:
Input bytes : 268676 0 bps
Output bytes : 268744 0 bps
Input packets: 68 0 pps
Output packets: 68 0 pps
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 0
L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0
SRAM errors: 0, HS link CRC errors: 0
Output errors:
Carrier transitions: 1, Errors: 0, Drops: 0, Aged packets: 0
Active alarms : None
Active defects : None
DS3 Media: Seconds Count State
PLL Lock 0 0 OK
Reframing 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
IDLE 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 1 65535
PCV 0 0
CCV 0 0
LES 1
PES 0
PSES 0
CES 0
CSES 0
SEFS 0
UAS 0
HDLC configuration:
Policing bucket: Enabled, Bit rate:0 %, Threshold:0
Shaping bucket : Enabled, Bit rate:0 %, Threshold:0
Giant threshold: 4484, Runt threshold: 3
DSU configuration:
Compatibility mode: None, Scrambling: Disabled, Subrate: Disabled
FEAC loopback: Inactive, Response: Disabled, Count: 0
BERT time period: 10 seconds, Elapsed: 0 seconds
Algorithm: 2^3 - 1, Pseudorandom (1), Error rate: 10e-0
PFE configuration:
Destination slot: 5, Stream number: 8, PLP byte: 1 (0x00)
COS transmit queue bandwidth:
Queue0: 100, Queue1: 0, Queue2: 0, Queue3: 0
COS weighted round robin:
Queue0: 100, Queue1: 0, Queue2: 0, Queue3: 0
Logical interface t3-5/2/0.0 (Index 11) (SNMP ifIndex 42)
Flags: Point-To-Point SNMP-Traps, DLCI 10, Encapsulation: FR-NLPID
Traffic statistics:
Input bytes : 268880
Output bytes : 268880
Input packets: 68
Output packets: 68
Local statistics:
Input bytes : 268880
Output bytes : 268880
Input packets: 68
Output packets: 68
Transit statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Protocol inet, MTU: 4470, Flags: None
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.2.200, Local: 192.168.2.225, Broadcast:Unspecified
Protocol iso, MTU: 4470, Flags: None
Logical interface t3-5/2/0.1 (Index 12) (SNMP ifIndex 52)
...
Input Errors
The following paragraphs
explain the counters that are not obvious:
Errors Sum
of the incoming frame aborts and FCS errors.
Policed
Discards Frames that the incoming packet match code
discarded because they were not recognized or of interest. Usually,
this field reports protocols that the JUNOS software does not
handle, such as CDP.
L3
incompletes This counter is incremented when the incoming
packet fails Layer 3 (usually IPv4) sanity checks of the header.
For example, a frame with less than 20 bytes of available IP header
would be discarded and this counter would be incremented.
L2
channel errors This counter increments when the software
could not find a valid logical interface (that is, something like
t3-1/2/3.0) for an incoming frame.
L2
mismatch timeouts Count of malformed or short packets that
cause the incoming packet handler to discard the frame as
unreadable.
SRAM
errors The counter increments when a hardware error has
occurred in the SRAM on the PIC. The value in this field should
always be 0. If it increments, the PIC is broken.
HS
link CRC errors Count of errors on the high-speed links
between the ASICs responsible for handling the router interfaces.
Output Errors
Carrier transitions
Number of times the interface has gone from down to up. This number should not increment quickly, increasing, for example, only when the cable is unplugged or the far end system is powered down and up. If it does increment quickly (perhaps, 1 every 10 seconds), then something is broken check the cable, the far end system, or the PIC.
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 increment once for every packet that is dropped by the ASIC's RED mechanism.
Aged packets Number of packets that remained in shared packet SDRAM for 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 possible broken hardware.
Output Field Definitions
Active alarms and Active defects
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T3 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 the red or yellow alarm LED on the craft interface.
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Addresses
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Addresses
associated with the logical interface.
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Broadcast
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The IP address for the broadcast of this interface.
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Clocking
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Reference clock
source.
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CRC
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Frame checksum on
the interface (either 16 or 32).
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Destination
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IP address of the
remote side of the connection.
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Device Flags
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Specific
information about the physical device. Possible values are
described in Device Flags Field.
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DLCI
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If Frame Relay
encapsulation is configured, the DLCI number of the logical
interface.
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DS3 media
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Counts of T3
media-specific errors.
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DSU
configuration
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Information about
the DSU configuration. The last three lines (Bit count, Error bit
count, and LOS information) are displayed only if a BERT test has
ever been run on the interface.
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Enabled
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State of the
interface. Possible values are described in Enabled Field.
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Encapsulation
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Encapsulation on
the logical interface.
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HDLC
configuration
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Information about
the HDLC configuration.
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Input rate,
Output rate
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The rate of bits
and packets received and transmitted on the interface.
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Interface
Flags
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Specific
information about the interface. Possible values are described in
Interface Flags Field.
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Interface
index
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Physical
interface's index number, which reflects its initialization
sequence.
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Link flags
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Specific
information about the links.
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Link level
type
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Encapsulation
being used on the physical interface.
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Local
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IP address of the
logical interface.
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Local
statistics
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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.
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Logical
interface, Index, SNMP ifIndex
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Name of the
logical interface, the logical interface's index number (which
reflects its initialization sequence), and the logical interface's
SNMP interface index number.
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Loopback
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Whether loopback
is enabled and the type of loopback (local or remote).
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Mode
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Indicates whether
or not C-bit parity mode is enabled.
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MTU
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MTU size on the
physical interface.
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PFE
configuration
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Information about
how the Packet Forwarding Engine is configured.
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Physical
Interface
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Name of the
physical interface.
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Protocol
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Protocol running
on the logical interface.
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SNMP ifIndex
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SNMP index number
for the interface.
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Speed
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Speed at which
the interface is running.
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Statistics
Last Cleared
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Time when the
statistics for the interface were last zeroed.
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Traffic
Statistics
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Number and rate
of bytes and packets received and transmitted on the physical
interface.
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Transit statistics
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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 a while (generally, less than 1 second) for this counter to stabilize.
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