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Display the Status of a Specific T1 Interface
Purpose
To display the status of a specific T1 interface when you need to investigate its status further.
Action
To display the status of a specific T1 interface, use the following Junos OS CLI operational mode command:
user@host> show interfaces t1-fpc/pic/port
Sample Output
user@host> show interfaces t1-1/1/0 Physical interface: t1-1/1/0, Enabled,Physical link is Down Interface index: 24, SNMP ifIndex: 20 Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: None, FCS: 16, Framing: ESF Device flags : Present Running Down Interface flags: Hardware-Down Point-To-Point SNMP-Traps Link flags : Keepalives Last flapped : 2002-01-01 00:00:35 UTC (00:00:59 ago) Input rate : 0 bps (0 pps) Output rate : 0 bps (0 pps) DS1 alarms : LOF, LOS DS1 defects : LOF, LOS
Meaning
The first line of the sample output shows the status of the link. In this example, the first line shows that the physical link is down. If the first 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. Also, the output shows loss of frame (LOF) and loss of signal (LOS) alarms active. Any active alarm or defect can cause the interface to be down.
