Step 2: Display the Status of a Specific T3 Interface

Action

To display the status of a specific T3 interface when you need to investigate its status further, use the following JUNOS CLI operational mode command:

user@host> show interfaces t3-fpc/pic/port

Sample Output

user@host> show interfaces t3-1/0/0

Physical interface: t3-1/0/0, Enabled, Physical link is Down

  Interface index: 9, SNMP ifIndex: 10

  Link-level type: Cisco-HDLC, MTU: 4474, Clocking: Internal

  Speed: T3, Loopback: None, CRC: 16, Mode: C/Bit parity

  Device flags   : Present Running Down

  Interface flags: Hardware-Down Link-Layer-Down Point-To-Point SNMP-Traps

  Link flags     : Keepalives

  Keepalive Input: 116 (00:02:32 ago), Output: 185 (00:00:02 ago)

  Input rate     : 0 bps (0 pps), Output rate: 0 bps (0 pps)

  Active alarms  : LOF, LOS

  Active defects : LOF, LOS

  Logical interface t3-1/0/0.0 (Index 12) (SNMP ifIndex 32)

    Flags: Device-down Point-To-Point SNMP-Traps, Encapsulation: Cisco-HDLC

    Protocol inet, MTU: 4470

      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary

        Destination: 1.1.1.0/30, Local: 1.1.1.1

What It Means

The first line of the sample output shows the status of the link. If this line shows that the physical link is up, the physical link is healthy and can pass packets. If this line shows that the physical link is down, the physical link is unhealthy and cannot pass packets.