After upgrading to 21.4R3-S9.5 we observe empty cpu/memory on the backup RE
root@switch> show version detail no-forwarding
Hostname: switch
Model: ex4300-48p
Junos: 21.4R3-S9.5
root@switch> show virtual-chassis status
Preprovisioned Virtual Chassis
Virtual Chassis ID: facb.b230.56ae
Virtual Chassis Mode: Enabled
Mstr Mixed Route Neighbor List
Member ID Status Serial No Model prio Role Mode Mode ID Interface
0 (FPC 0) Prsnt PD3718440046 ex4300-48p 129 Master* N VC 5 vcp-255/1/0
1 vcp-255/1/1
1 (FPC 1) Prsnt PD3718430580 ex4300-48p 129 Backup N VC 0 vcp-255/1/0
2 vcp-255/1/1
2 (FPC 2) Prsnt PD3718430019 ex4300-48p 0 Linecard N VC 1 vcp-255/1/0
3 vcp-255/1/1
3 (FPC 3) Prsnt PD3718440414 ex4300-48p 0 Linecard N VC 2 vcp-255/1/0
4 vcp-255/1/1
4 (FPC 4) Prsnt PD3718440173 ex4300-48p 0 Linecard N VC 3 vcp-255/1/0
5 vcp-255/1/1
5 (FPC 5) Prsnt PD3718440465 ex4300-48p 0 Linecard N VC 4 vcp-255/1/0
0 vcp-255/1/1
root@EX4300>
{master:0}
root@EX4300> show chassis routing-engine
Nov 05 22:21:04
Routing Engine status:
Slot 0:
Current state Master
Temperature 51 degrees C / 123 degrees F
CPU temperature 51 degrees C / 123 degrees F
DRAM 2048 MB
Memory utilization 74 percent
5 sec CPU utilization:
User 49 percent
Background 0 percent
Kernel 47 percent
Interrupt 1 percent
Idle 4 percent
Model EX4300-48P
Serial ID PD3718440046
Start time 2024-10-30 08:50:49 UTC
Uptime 6 days, 13 hours, 26 minutes, 59 seconds
Last reboot reason Router rebooted after a normal shutdown.
Load averages: 1 minute 5 minute 15 minute
2.36 1.98 1.85
Slot 1:
Current state Backup
CPU temperature 54 degrees C / 129 degrees F
Memory utilization 0 percent >>>>>>>>>>>>>>>
User 0 percent
Kernel 0 percent
Interrupt 0 percent
Idle 0 percent >>>>>>>>>>>>>>>>>>>>>>>>
Start time 2024-10-30 08:50:52 UTC
0.19 0.20 0.17
It is cosmetic issue. This will not impact the device.
When the issue is observed, we will not know the actual CPU/Memory.