root-re0> show chassis alarms
1 alarms currently active
Alarm time Class Description
2026-01-01 02:41:16 UTC Major FPC 0 Major Errors
FPC Major error observed due to XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN post member link of an AE interface flaps, resulting in traffic impact on the affected PFE.
The ASIC queues on most of Trio ASICS never operate in Back pressure mode but in the Drop mode. Because they operate in Drop mode, it is not possible for the queue to participate in back-pressure compute logic.
However, since we are seeing a Back pressure specific alarm being raised for a queue that should be supposedly be in Drop mode.
Below logs and alarms observed during the event.
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router-re0 fpc0 cmerror_set_error: Module: XQSS(1), pfe id:1, error_id:0x23006d reason:XQ-SS[1]: Vote counter overrun error in Drop engine 0 for wan qnum 89, vote_ptr 24
router-re0-fpc0 ytchip-xqss[17059]: [Info] CDA: XQSS: 1 setError success; xqssModuleHandleId:12 error code: 0x2293869 : XQ-SS[1]: Vote counter overrun error in Drop engine 0 for wan qnum 89, vote_ptr 24
router-re0-fpc0 resiliencyd[14657]: CMError: /fpc/0/platformd/0/cm/0/xqss/1/XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN (0x23006d), scope: pfe, category: functional, severity: major, module: XQSS(1), type: XQSS DSTAT DROP0 VOTE overrun, oc_category: default
router-re0-fpc0 resiliencyd[14657]: Performing action get-state for error /fpc/0/platformd/0/cm/0/xqss/1/XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN (0x23006d) in module: XQSS(1) with scope: pfe category: functional level: major, oc_category: default
router-re0-fpc0 root[29285]: pfe_get_state.sh : Running PFE get state script
router-re0-fpc0 root[29293]: pfe_get_state.sh : PFE AFT Get state started - Module: (xqss), Error: (XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN), Date/Time: (18/05/2026 19:38:33)
router-re0-fpc0 resiliencyd[14657]: Performing action cmalarm for error /fpc/0/platformd/0/cm/0/xqss/1/XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN (0x23006d) in module: XQSS(1) with scope: pfe category: functional level: major, oc_category: default
router-re0-fpc0 resiliencyd[14657]: EMF_EVO_ALARM_SET: Alarm set: FPC color=red, class=CHASSIS, reason=FPC 0 Major Errors
router-re0-fpc0 resiliencyd[14657]: Performing action disable-pfe for error /fpc/0/platformd/0/cm/0/xqss/1/XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN (0x23006d) in module: XQSS(1) with scope: pfe category: functional level: major, oc_category: default
router-re0> show chassis alarms
user@router-fpc0:pfe> show cmerror module fpc 0 | grep XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 0 Major 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 1 Major 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 2 Major 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 3 Major 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
As a workaround: Restart the FPC to resolve the issue temporary.
Permanent fix :
We have reduced the severity of the back pressure specific alarms to minor to rule out false positives.
0x23006d 2 Minor 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 3 Minor 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 0 Minor 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
0x23006d 1 Minor 1 0 0 0 0 XQSS_CMERROR_DSTAT_INT_REG_DROP0_VOTE_OVRN
Issue has been fixed in below releases :
evo:25.4R2-EVO
evo:26.2R2-EVO
evo:26.3R1-EVO
junos:23.2R2-S8
junos:24.2R2-S6
junos:25.2R2-S2
junos:25.4R2
junos:26.2R1
junos:26.2R2
junos:26.3R1