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play_arrow Configuring Interfaces
play_arrow Port Speed for Switches
play_arrow Configuring Aggregated Ethernet Interfaces
play_arrow Flexible Ethernet Services Encapsulation
- Flexible Ethernet Services Encapsulation
play_arrow Monitoring and Troubleshooting Information
- Monitoring Interfaces
- Troubleshooting Interfaces
play_arrow Configuration Statements and Operational Commands
- Common Output Fields Description
- Junos CLI Reference Overview

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English

Monitoring Interfaces

date_range 20-Dec-24

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The below topics discuss the monitoring of the status and traffic, system process information, system properties, statistics for a fast Ethernet and the tracing operations of the interface process.

Purpose

View interface status to monitor interface bandwidth utilization and traffic statistics.

Action

To view interface status for all the interfaces, enter show interfaces xe.
To view status and statistics for a specific interface, enter show interfaces xe interface-name.
To view status and traffic statistics for all interfaces, enter either show interfaces xe detail or show interfaces xe extensive.

Meaning

For details about output from the CLI commands, see show interfaces xe.

Monitoring System Process Information

Purpose
Action
Meaning

Purpose

View the processes running on the device.

Action

To view the software processes running on the device:

user@switch> show system processes

Meaning

Table 1 summarizes the output fields in the system process information display.

The display includes the total CPU load and total memory utilization.

Table 1: Summary of System Process Information Output Fields
Field	Values
PID	Identifier of the process.
Name	Owner of the process.
State	Current state of the process.
CPU Load	Percentage of the CPU that is being used by the process.
Memory Utilization	Amount of memory that is being used by the process.
Start Time	Time of day when the process started.

Monitoring System Properties

Purpose
Action
Meaning

Purpose

View system properties such as the name, IP address, and resource usage.

Action

To monitor system properties in the CLI, enter the following commands:

show system uptime
show system users
show system storage

Meaning

Table 2 summarizes key output fields in the system properties display.

Table 2: Summary of Key System Properties Output Fields
Field	Values	Additional Information
General Information
Serial Number	Serial number of device.
Junos OS Version	Version of Junos OS active on the switch, including whether the software is for domestic or export use.	Export software is for use outside the USA and Canada.
Hostname	Name of the device.
IP Address	IP address of the device.
Loopback Address	Loopback address.
Domain Name Server	Address of the domain name server.
Time Zone	Time zone on the device.
Time
Current Time	Current system time, in Coordinated Universal Time (UTC).
System Booted Time	Date and time when the device was last booted and how long it has been running.
Protocol Started Time	Date and time when the protocols were last started and how long they have been running.
Last Configured Time	Date and time when a configuration was last committed. This field also shows the name of the user who issued the last `commit` command.
Load Average	CPU load average for 1, 5, and 15 minutes.
Storage Media
Internal Flash Memory	Usage details of internal flash memory.
External Flash Memory	Usage details of external USB flash memory.
Logged in Users Details
User	Username of any user logged in to the switch.
Terminal	Terminal through which the user is logged in.
From	System from which the user has logged in. A hyphen indicates that the user is logged in through the console.
Login Time	Time when the user logged in.	This is the user@switch field in `show system users` command output.
Idle Time	How long the user has been idle.

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

Purpose
Action
Meaning

Purpose

To monitor statistics for a Fast Ethernet or Gigabit Ethernet interface, use the following Junos OS CLI operational mode command:

Action

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user@host> monitor interface (fe-fpc/pic/port | ge-fpc/pic/port)

We recommend that you use the monitor interface fe-fpc/pic/portor monitor interface ge-fpc/pic/portcommand only for diagnostic purposes. Do not leave these commands on during normal router operations because real-time monitoring of traffic consumes additional CPU and memory resources.

Sample Output

The following sample output is for a Fast Ethernet interface:

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user@host> monitor interface fe-2/1/0
Interface: fe-2/1/0, Enabled, Link is Up
Encapsulation: Ethernet, Speed: 100mbps
Traffic statistics:                                           Current Delta
  Input bytes:               282556864218 (14208 bps)               [40815]
  Output bytes:               42320313078 (384 bps)                   [890]
  Input packets:                739373897 (11 pps)                    [145]
  Output packets:               124798688 (1 pps)                      [14]
Error statistics:
  Input errors:                         0                               [0]
  Input drops:                          0                               [0]
  Input framing errors:                 0                               [0]
  Policed discards:               6625892                               [6]
  L3 incompletes:                      75                               [0]
  L2 channel errors:                    0                               [0]
  L2 mismatch timeouts:                 0                               [0]
  Carrier transitions:                  1                               [0]
  Output errors:                        0                               [0]
  Output drops:                         0                               [0]
  Aged packets:                         0                               [0]
Active alarms : None
Active defects: None
Input MAC/Filter statistics:
  Unicast packets               464751787                             [154]
  Packet error count                    0                               [0]

Meaning

Use the information from this command to help narrow down possible causes of an interface problem.

If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

The second column shows cumulative statistics since the last time you cleared them using the clear interfaces statistics interface-name command. The third column shows cumulative statistics since you ran the monitor interface interface-name command. If input errors are increasing, follow these steps:

Check the cabling to the router and ask the carrier to verify the line’s integrity. Ensure you are using the correct cables for the interface port—single-mode fiber for a single-mode interface, and multimode fiber for a multimode interface.
For fiber-optic connections, measure the received light level at the receiver end and ensure it meets the Ethernet interface’s specification.
Measure the transmit light level on the Tx port to confirm it is within the specified range.

Trace Operations of the Interface Process

To trace the operations of the router or switch interface process, dcd, perform the following steps:

In configuration mode, go to the [edit interfaces] hierarchy level:
```
[edit]
user@host# edit interfaces
```
Configure the traceoptions statement.
```
[edit interfaces]
user@host# edit traceoptions
```
Configure the no-remote-trace option to disable remote tracing.
```
[edit interfaces traceoptions]
user@host# set no-remote-trace
```
Configure the file filename option.
```
[edit interfaces traceoptions]
user@host# edit file
```

Configure the files number option, match regular-expression option, size size option, and world-readable | no-world-readable option.

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[edit interfaces traceoptions file]
user@host# set files number
user@host# set match regular-expression
user@host# set size size
user@host# set word-readable | no-world-readable

Configure the tracing flag.

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[edit interfaces traceoptions]
user@host# set flag flag-option

Configure the disable option in flag flag-option statement to disable the tracing operation. You can use this option to disable a single operation when you have defined a broad group of tracing operations, such as all.
```
[edit interfaces traceoptions]
user@host# set flag flag-option disable
```

You can specify the following flags in the interfaces traceoptions statement:

all—Enable all configuration logging.
change-events—Log changes that produce configuration events.
gres-events—Log the events related to GRES.
resource-usage—Log the resource usage for different states.
config-states—Log the configuration state machine changes.
kernel—Log configuration IPC messages to kernel.
kernel-detail—Log details of configuration messages to kernel.
select-events—Log the events on select state machine.

By default, interface process operations are placed in the file named dcd and three 1-MB files of tracing information are maintained.

For general information about tracing, see the tracing and logging information in the Junos OS Administration Library for Routing Devices.

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NEXT arrow_forward Troubleshooting Interfaces

Interfaces User Guide for Switches

ON THIS PAGE

Monitoring Interfaces

Monitoring Interface Status and Traffic

Purpose

Action

Meaning

Monitoring System Process Information

Purpose

Action

Meaning

Monitoring System Properties

Purpose

Action

Meaning

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

Purpose

Action

Meaning

Trace Operations of the Interface Process

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Interfaces User Guide for Switches

ON THIS PAGE

Monitoring Interfaces

Monitoring Interface Status and Traffic

Purpose

Action

Meaning

Monitoring System Process Information

Purpose

Action

Meaning

See Also

Monitoring System Properties

Purpose

Action

Meaning

See Also

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

Purpose

Action

Meaning

Trace Operations of the Interface Process

See Also

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