Step 2: Display the Status of a Specific Fast Ethernet
or Gigabit Ethernet Interface

Action

To display the status of a specific Fast Ethernet or Gigabit Ethernet interface when you need to investigate its status further, use the following JUNOS CLI operational mode command:

user@host> show interfaces (fe-fpc/pic/port | ge-fpc/pic/port)

Sample Output 1

The following sample output is for a Fast Ethernet interface with the physical link up:

user@host> show interfaces fe-2/1/0 

Physical interface: fe-2/1/0, Enabled, Physical link is Up

  Interface index: 31, SNMP ifIndex: 35

  Description: customer connection

  Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled

  Speed: 100mbps, Loopback: Disabled, Flow control: Enabled

  Device flags   : Present Running

  Interface flags: SNMP-Traps

  Link flags     : None

  Current address: 00:90:69:86:71:1b, Hardware address: 00:90:69:86:71:1b

  Input rate     : 25768 bps (11 pps), Output rate: 1576 bps (3 pps)

  Active alarms  : None

  Active defects : None

  Logical interface fe-2/1/0.0 (Index 2) (SNMP ifIndex 43)

    Flags: SNMP-Traps, Encapsulation: ENET2

    Protocol inet, MTU: 1500, Flags: Is-Primary

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.116.151.218/29, Local: 10.119.115.217

        Broadcast: 10.116.151.225

Sample Output 2

The following output is for a Gigabit Ethernet interface with the physical link up:

user@host> show interfaces ge-3/1/0 

Physical interface: ge-3/1/0, Enabled, Physical link is Up

  Interface index: 41, SNMP ifIndex: 55

  Description: customer connection

  Link-level type: Ethernet, MTU: 1514, Source filtering: Disabled

  Speed: 1000mbps, Loopback: Disabled, Flow control: Enabled

  Device flags   : Present Running

  Interface flags: SNMP-Traps

  Link flags     : None

  Current address: 00:90:69:85:71:99, Hardware address: 00:90:69:85:71:99

  Input rate     : 7412216 bps (1614 pps), Output rate: 2431184 bps (1776 pps)

  Active alarms  : None

  Active defects : None

  Logical interface ge-3/1/0.0 (Index 11) (SNMP ifIndex 57)

    Flags: SNMP-Traps, Encapsulation: ENET2

    Protocol inet, MTU: 1500

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.117.65.192/30, Local: 10.115.65.193

        Broadcast: 10.115.65.195

What It Means

The first line of sample output 1 and 2 shows that the physical link is up. This means that the physical link is healthy and can pass packets. Further down the sample output, look for active alarms and defects. If you see active alarms or defects, to further diagnose the problem, see Step 3, Display Extensive Status Information for a Specific Fast Ethernet or Gigabit Ethernet Interface, to display more extensive information about the Fast Ethernet interface and the physical interface that is down.