All interfaces went down but device was in operational state. Required full restart to restore.
root@Router> show system errors active detail
System Active Errors Detail Information
CB 0
----------------------------------------------------------------
Error Name : PLL input failure
Identifier : /cb/0/clockd/0/C_PLL_LOCK/0/clocking/0/PLL input failure
Description : PLL input failure
State : enabled
Scope : board
Category : functional
Level : major
Threshold : 1
Error limit : 1
Occur count : 1
Clear count : 0
Last occurred(ms ago) : 2025-09-16 04:45:56 BST (16424295 ms ago)
Identifier : /cb/0/clockd/0/NIF_PLL_LOCK/0/clocking/0/PLL input failure
Identifier : /cb/0/clockd/0/Q2U_BS_PLL_LOCK/0/clocking/0/PLL input failure
Last occurred(ms ago) : 2025-09-16 04:45:56 BST (16424294 ms ago)
Identifier : /cb/0/clockd/0/U_PLL_LOCK/0/clocking/0/PLL input failure
RE 0
Error Name : PCIe AER Uncorrected error threshold exceeded
Identifier : /re/0/emfd-fpa/0/0000:00:09.0/0/pci_resiliency/0/PCIe AER Uncorrected error threshold exceeded
Description : PCIe AER Uncorrected error threshold exceeded
Category : io
Last occurred(ms ago) : 2025-09-16 04:45:39 BST (16441743 ms ago)
Identifier : /re/0/emfd-fpa/0/0000:00:0a.0/0/pci_resiliency/0/PCIe AER Uncorrected error threshold exceeded
Last occurred(ms ago) : 2025-09-16 04:45:36 BST (16444033 ms ago)
Identifier : /re/0/emfd-fpa/0/0000:00:0b.0/0/pci_resiliency/0/PCIe AER Uncorrected error threshold exceeded
Identifier : /re/0/emfd-fpa/0/0000:00:0c.0/0/pci_resiliency/0/PCIe AER Uncorrected error threshold exceeded
Last occurred(ms ago) : 2025-09-16 04:45:39 BST (16441744 ms ago)
Below alarms are HW specific & not related to any software issue.
Alarms:
2025-09-16 04:45:39 BST Major RE 0 PCI Uncorrected error on dev 0000:00:09.0
2025-09-16 04:45:36 BST Major RE 0 PCI Uncorrected error on dev 0000:00:0a.0
2025-09-16 04:45:39 BST Major RE 0 PCI Uncorrected error on dev 0000:00:0b.0
2025-09-16 04:45:39 BST Major RE 0 PCI Uncorrected error on dev 0000:00:0c.0
2025-09-16 04:45:56 BST Major CB 0 C_PLL_LOCK PLL Input Failure
2025-09-16 04:45:56 BST Major CB 0 NIF_PLL_LOCK PLL Input Failure
2025-09-16 04:45:56 BST Major CB 0 Q2U_BS_PLL_LOCK PLL Input Failure
2025-09-16 04:45:56 BST Major CB 0 U_PLL_LOCK PLL Input Failure
This is BCM chip reporting PCIe issues which in turn results in hang of pfe/interfaces.
An AER (Advanced Error Reporting) uncorrected error indicates a PCI Express communication problem that cannot be automatically fixed by the hardware and may lead to system instability or failure.
These errors, often fatal to the PCIe link, require system intervention like resetting a component, the link, or even rebooting the system to resolve.
To detect the current kind of issue, below CLIs can help, when issue is hit.
show system alarms
show chassis alarms
show system errors active detail
Workaround for recovery is to do full restart or power cycle.
We may need to do proactive RMA for chassis if customer requests same.