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Monitoring the Interfaces for J-series Devices

The interface information is divided into multiple parts. To view general interface information such as available interfaces, operation states of the interfaces, and descriptions of the configured interfaces, select Monitor>Interfaces in the J-Web interface. To view interface-specific properties such as administrative state or traffic statistics in the J-Web interface, select the interface name on the Interfaces page.

Alternatively, enter the following CLI show commands:

Table 4 summarizes key output fields in interfaces displays.

Table 4: Summary of Key Interfaces Output Fields

Field

Values

Additional Information

Interface Summary  

Interface Name

Name of interface.

(See the interface naming conventions in the JUNOS Software Interfaces and Routing Configuration Guide.)

Click an interface name to see more information about the interface.

Channelized interfaces appear as two interfaces, which can both be monitored. For example:

  • If ce1-3/0/0 is configured as a clear channel, you can monitor ce1-3/0/0 and e1-3/0/0.
  • If ct1-3/0/1 is channelized, you can monitor ct1-3/0/1 and ds-3/0/1:1.

Oper State

Link state of the interface: Up or Down.

The operational state is the physical state of the interface. If the interface is physically operational, even if it is not configured, the operational state is Up. An operational state of Down indicates a problem with the physical interface.

Admin State

Whether the interface is enabled up (Up) or disabled (Down).

Interfaces are enabled by default. To disable an interface:

  • In the J-Web configuration editor, select the Disable check box on the Interfaces>interfaces-name page.
  • In the CLI configuration editor, add the disable statement at the [edit interfaces interfaces-name] level of the configuration hierarchy

Description

Configured description for the interface.

 
Interface: interface-name

State

Link state of the interface: Up or Down.

The operational state is the physical state of the interface. If the interface is physically operational, even if it is not configured, the operational state is Up. An operational state of Down indicates a problem with the physical interface.

Admin State

Whether the interface is enabled up (Up) or disabled (Down).

Interfaces are enabled by default. To disable an interface:

  • In the J-Web configuration editor, select the Disable check box on the Interfaces>interfaces-name page.
  • In the CLI configuration editor, add the disable statement at the [edit interfaces interfaces-name] level of the configuration hierarchy

MTU

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

 

Speed

Speed at which the interface is running.

 

Current Address

Configured media access control (MAC) address.

 

Hardware Address

Hardware MAC address.

 

Last Flapped

Date, time, and how long ago the interface changed state from Down to Up.

 

Active Alarms

List of any active alarms on the interface.

Configure alarms on interfaces as follows:

  • In the J-Web configuration editor, on the Chassis>Alarm>interface-type page
  • In the CLI configuration editor, with the alarm statement at the [edit chassis] level of the configuration hierarchy

Traffic Statistics

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

 

Input Errors

Input errors on the interface. (See the following rows of this table for specific error types.)

 

Drops

Number of packets dropped by the output queue.

If the interface is saturated, this number increments once for every packet that is dropped by the device's random early detection (RED) mechanism.

Framing errors

Sum of ATM Adaptation Layer (AAL5) packets that have frame check sequence (FCS) errors, AAL5 packets that have reassembly timeout errors, and AAL5 packets that have length errors.

 

Policed discards

Number of packets dropped as a result of routing policies configured on the interface.

 

For more information about the J-Web Monitor task, see Monitor Tasks.


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