This article explains the error seen on device with the SIB 0 fault alarm and affected SIB and FPC offline by the system to try to recover the condition.
Fabric management error for SIB 0 due to PIO errors and SIB0 offline as part of healing process.
Jan 14 12:18:39.783 chassisd[12148]: CHASSISD_FM_SIB_ERROR: Fabric management error for SIB 0: Set SIB to FAULT (Fault due to PIO errors)
Jan 14 12:18:39.784 chassisd[12148]: CHASSISD_FRU_TO_SNMP_INDEX_ERROR: snmp_fru_to_bidx: fru_name:SIB: fru_type:8
Jan 14 12:18:39.785 alarmd[12166]: Alarm set: SIB id=16777332, color=RED, class=CHASSIS, reason=SIB 0 Fault
Jan 14 12:18:39.786 craftd[12168]: Receive FX craftd set alarm message: color: 1 class: 100 object: 116 slot: 0 silent: 0 short_reason=SIB 0 Fault long_reason=SIB 0 Fault id=16777332 reason=16777216
Jan 14 12:18:39.786 craftd[12168]: Major alarm set, SIB 0 Fault
Jan 14 12:18:51.529 chassisd[12148]: CHASSISD_FM_ACTION_PLANE_OFFLINE: Fabric sib 0 offline initiated to attempt healing of the fabric down condition.
Jan 14 12:18:51.530 chassisd[12148]: CHASSISD_FRU_OFFLINE_NOTICE: Taking SIB 0 offline: Fabric down
Fabric manager initiated SIB0 online but it causes FPC 0 Fabric Chip Failure and did FPC offline due to unreachable destinations.
Jan 14 12:18:52.488 chassisd[12148]: CHASSISD_FM_ACTION_PLANE_ONLINE: Fabric sib 0 online initiated to attempt healing of the fabric down condition
Jan 14 12:18:52.497 craftd[12168]: Major alarm set, FPC 0 Fabric Chip Failure
Jan 14 12:19:11.530 chassisd[12148]: CHASSISD_FRU_OFFLINE_NOTICE: Taking FPC 0 offline: FPC offlined due to unreachable destinations
Restarted FPC to clear these errors and after few minutes below alarm triggered.
Device> show chassis alarms
3 alarms currently active
Alarm time Class Description
2025-01-15 00:38:52 PST Major FPC 0 Fabric Chip Failure
2025-01-15 00:38:52 PST Minor SIB 0 Not Online
2025-01-15 00:29:06 PST Major FPC 0 Major Errors
The alarm "SIB0 Fault due to PIO errors" indicates a problem with the chassis process (chassisd) related to the SIB (Switch Interface Board) PIO (Programmed Input/Output) errors.
In general, PIO errors can be transient hardware errors that may clear on their own. If the error is transient, it might clear after a restart of the affected components.
To resolve the issue, power cycle the device.