Troubleshooting the ACX7348 Router
Troubleshooting ACX7348 routers includes recognizing alarm types and alarm severity classes and resolving the error conditions that trigger alarms.
Alarm Types and Severity Classes on ACX7348 Routers
Before monitoring the alarms on the router, become familiar with the terms defined in Table 1.
|
Term |
Definition |
|---|---|
|
Alarm |
Signal that alerts you to conditions that might prevent normal operation. On a router, the alarm signal is the ALM LED that is lit on the front of the chassis. |
|
Alarm condition |
Failure event that triggers an alarm. |
|
Alarm severity |
Seriousness of the alarm. The level of severity can be either major (steady red) or minor (steady amber). |
|
Chassis alarm |
Predefined alarm that is triggered by a physical condition on the router, such as a power failure, excessive component temperature, or media failure. |
|
System alarm |
Predefined alarm that is triggered by a missing rescue configuration or failure to install a license for a licensed software feature. |
Alarm Types
The ACX7348 router supports these alarms:
-
Chassis alarms indicate a failure on the router or one of its components. Chassis alarms are preset and cannot be modified.
-
System alarms indicate a missing rescue configuration. System alarms are preset and cannot be modified, although you can configure them to appear automatically in the J-Web interface display or CLI display.
Alarm Severity Classes
Alarms on ACX7348 routers have two severity classes:
-
Major (steady red)—Indicates a critical situation on the router that has resulted from one of the following conditions. A major alarm condition requires immediate action.
-
One or more hardware components have failed.
-
One of the fans has failed.
-
A power supply module (PSM) is not connected or a PSM has failed.
-
One or more hardware components have exceeded temperature thresholds.
-
An alarm condition that is configured on an interface has triggered a critical warning.
-
-
Minor (steady amber)—Indicates a noncritical condition on the router that, if left unchecked, might cause an interruption in service or degradation in performance. A minor alarm condition requires monitoring or maintenance.
A missing rescue configuration generates a minor system alarm.
Troubleshooting 100 Gbps Interface Bring-up Failure
Problem
The 100 Gbps links on an ACX7348 devices fail to come up, indicating a
connectivity issue. This issue is confirmed in the show interfaces
<interface-name> media command output, which shows the
physical link as down, and the show interfaces diagnostics optics
<interface-name> command output, which reports a Tx
loss of signal functionality alarm.
Here's the sample output of the show interfaces <interface-name>
media command:
user@device> show interfaces et-0/0/27 media
Physical interface: et-0/0/27, Enabled, Physical link is Down
Interface index: 1264, SNMP ifIndex: 569
Description: to.se26:1/1/c6/1_L3_lag
Link-level type: Ethernet, MTU: 9216, LAN-PHY mode, Speed: 100Gbps, BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Disabled, Media type: Fiber
Device flags : Present Running Transceiver-Tx-Alarm
Interface flags: Hardware-Down SNMP-Traps Internal: 0x100000
CoS queues : 8 supported, 8 maximum usable queues
Current address: 3c:08:cd:8b:5f:19, Hardware address: 3c:08:cd:8b:5e:20
Last flapped : 2025-06-17 20:06:16 UTC (22:18:01 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : LINK
Active defects : LINK, LOCAL-FAULT
Ethernet FEC Mode : NONE
FEC Codeword size 0
FEC Codeword rate 0.000
Ethernet FEC statistics Errors
FEC Corrected Errors 0
FEC Uncorrected Errors 0
FEC Corrected Errors Rate 0
FEC Uncorrected Errors Rate 0
MAC statistics:
Input bytes: 24, Input packets: 0, Output bytes: 11013984, Output packets: 43968
Filter statistics:
Filtered packets: 0, Padded packets: 0, Output packet errors: 0
Interface transmit statistics: Disabled
Link Degrade :
Link Monitoring : DisableThe following is the sample output of the show interfaces diagnostics
optics <interface-name> command:
user@device> show interfaces diagnostics optics et-0/0/27
Physical interface: et-0/0/27
Module temperature : 27 degrees C / 80 degrees F
Module voltage : 3.29 V
Module max power : 4 W
Module temperature high alarm : Off
Module temperature low alarm : Off
Module temperature high warning : Off
Module temperature low warning : Off
Module voltage high alarm : Off
Module voltage low alarm : Off
Module voltage high warning : Off
Module voltage low warning : Off
Module temperature high alarm threshold : 76 degrees C / 168 degrees F
Module temperature low alarm threshold : -6 degrees C / 21 degrees F
Module temperature high warning threshold : 73 degrees C / 163 degrees F
Module temperature low warning threshold : -3 degrees C / 26 degrees F
Module voltage high alarm threshold : 3.7 V
Module voltage low alarm threshold : 3 V
Module voltage high warning threshold : 3.599 V
Module voltage low warning threshold : 3.049 V
Laser bias current high alarm threshold : 130 mA
Laser bias current low alarm threshold : 5 mA
Laser bias current high warning threshold : 125 mA
Laser bias current low warning threshold : 10 mA
Laser output power high alarm threshold : 5.011 mW / 7.00 dBm
Laser output power low alarm threshold : 0.229 mW / -6.39 dBm
Laser output power high warning threshold : 2.511 mW / 4.00 dBm
Laser output power low warning threshold : 0.575 mW / -2.40 dBm
Laser rx power high alarm threshold : 4.466 mW / 6.49 dBm
Laser rx power low alarm threshold : 0.114 mW / -9.40 dBm
Laser rx power high warning threshold : 3.548 mW / 5.49 dBm
Laser rx power low warning threshold : 0.162 mW / -7.90 dBm
Laser temperature high alarm threshold : 76 degrees C / 168 degrees F
Laser temperature low alarm threshold : -6 degrees C / 21 degrees F
Laser temperature high warning threshold : 73 degrees C / 163 degrees F
Laser temperature low warning threshold : -3 degrees C / 26 degrees F
Lane 0
Laser bias current : 0 mA
Laser output power : 0 mW / -Inf dBm
Laser temperature : 27 degrees C / 80 degrees F
Laser receiver power : 1.334 mW / 1.25 dBm
Laser bias current high alarm : Off
Laser bias current low alarm : Off
Laser bias current high warning : Off
Laser bias current low warning : Off
Laser temperature high alarm : Off
Laser temperature low alarm : Off
Laser temperature high warning : Off
Laser temperature low warning : Off
Laser receiver power high alarm : Off
Laser receiver power low alarm : Off
Laser receiver power high warning : Off
Laser receiver power low warning : Off
Laser output power high alarm : Off
Laser output power low alarm : Off
Laser output power high warning : Off
Laser output power low warning : Off
Tx loss of signal functionality alarm : On
Rx loss of signal alarm : Off
Tx laser disabled alarm : OffSolution
As a temporary workaround, you can issue the following command to bring the interfaces up:
user@device> request system application app evo-pfemand restart node
re0
This issue is resolved with a PHY firmware upgrade included in the latest recommended Junos OS Evolved release. The firmware upgrade is available starting Junos OS Evolved release 23.2R2-S5.