Display T3 Alarms and Errors
Purpose
To display T3 alarms and errors, use the following Junos OS command-line interface (CLI) operational mode command:
Action
Sample Output
user@host> show interfaces t3-1/0/0 extensivePhysical 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 statistics:
Input : 116 (last seen 00:02:59 ago)
Output: 187 (last seen 00:00:09 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 2552 0 bps
Output bytes : 3703 0 bps
Input packets: 116 0 pps
Output packets: 161 0 pps
Input errors :
Errors: 0, Drops: 0, Framing errors: 229, Policed discards: 1
L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0
SRAM errors: 0, HS link CRC errors: 0
Output errors :
Carrier transitions: 4, Errors: 0, Drops: 0, Aged packets: 0
Active alarms : LOF, LOS - DS-3 active alarms and defects
Active defects : LOF, LOS
DS3 Media: Seconds Count State - T3 media-specific errors
PLL Lock 0 0 OK
Reframing 273 2 Defect Active
AIS 0 0 OK
LOF 273 2 Defect Active
LOS 273 2 Defect Active
IDLE 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 275 18022125
PCV 0 0
CCV 0 0
LES 275
PES 273
PSES 273
CES 273
CSES 273
SEFS 273
UAS 277
[...Output truncated...]
Meaning
The sample output shows active alarms and active defects. When a major error (such as an alarm indication signal [AIS]) is seen for a few consecutive frames, a defect is declared within 1 second from detection. At the defect level, the interface is taken down and routing protocols are immediately notified (this is the default). In most cases, when a defect persists for 2.5 second plus or minus 0.5 seconds, an alarm is declared.
Notification messages are logged at the alarm level. Depending on the type of T3 alarm, you can configure the craft panel to display the red or yellow alarm LED and simultaneously have the alarm relay activate a physically connected device (such as a bell).
Table 1 lists the T3 media-specific alarms or errors that can render the interface unable to pass packets.
Table 1: T3 Interface Error Counter Definitions
T3 Alarm or Error | Definition |
|---|---|
AIS | Alarm indication signal |
EXZ | Excessive zeros |
FERF | Far-end failures |
IDLE | Idle code detected |
LCV | Line code violation |
LOS | Loss of signal |
LOF | Loss of frame |
YLW | Remote defect indication (yellow alarm) |
PLL | Phase locked loop |
