Verify That the Interface Is Up

Display the status of a Channelized DS1 or DS3 interface to determine whether the physical link is up or down.

Action

To verify that the status of the Channelized DS1 or DS3 interface is up, use one of the following JUNOS command-line interface (CLI) operational mode commands:

The following sample output is for a channelized DS3 to DS1 interface:

user@host#  show interfaces t1-2/1/0:20                          
Physical interface: t1-2/1/0:20, Enabled, Physical link is Up
  Interface index: 210, SNMP ifIndex: 173
  Link-level type: Cisco-HDLC, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: Local, FCS: 16,
  Mode: C/Bit parity, Framing: ESF
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive: Input: 39 (00:00:06 ago), Output: 0 (never)
  CoS queues     : 4 supported
  Last flapped   : 2004-05-20 21:46:27 UTC (00:14:28 ago)
  Input rate     : 16 bps (0 pps)
  Output rate    : 160 bps (0 pps)
  DS1   alarms   : None
  DS3   alarms   : None
  DS1   defects  : None
  DS3   defects  : None
  Logical interface t1-2/1/0:20.0 (Index 74) (SNMP ifIndex 213) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: Cisco-HDLC
    Protocol inet, MTU: 1500
      Flags: None
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.10.1.1, Local: 10.10.1.2

The sample output shows that the physical link is up and there are no DS1 or DS3 alarms or defects. You should not see any DS1 or DS3 alarms. You can check any interface on the Channelized DS3 port. See “ Locate Channelized DS3 Alarms and Errorsfor more information on Channelized DS3 alarms and errors.

Purpose

Action