Description

This article explains the meaning of the "MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7)" alarm that is seen on MX Series routers and indicates if any actions need to be taken.

Symptoms

The following log messages are seen on the Flexible PIC Concentrator (FPC):

Log messages:

Feb 15 09:58:58.482 2025 lab_MX2020 fpc15 MQSS(0): FI: Error cell sent to reorder engine - Stream 189, Count 1 
Feb 15 09:58:58.487 2025 lab_MX2020 fpc15 MQSS(1): FO: Packet Error - Error Packets 1, Stream 188, Port 14 
Feb 15 09:58:58.491 2025 lab_MX2020 fpc15 MQSS(1): FO: Output buffer deallocation failure 
Feb 15 09:58:58.517 2025 lab_MX2020 fpc15 eachip_hmcif_rx_intr_handler(7239): EA[1:0]: HMCIF Rx: Checksum error detected on WO response - Chunk Address 0xd20c2d 
Feb 15 09:58:58.553 2025 lab_MX2020 fpc15 eachip_hmcif_rx_intr_handler(7333): EA[1:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0xd20c2d 
Feb 15 09:59:13.836 2025 lab_MX2020 fpc15 Performing action cmalarm for error /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7) in module: MQSS(1) with scope: pfe category: functional level: major 
Feb 15 09:59:13.837 2025 lab_MX2020 fpc15 Performing action disable-pfe for error /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7) in module: MQSS(1) with scope: pfe category: functional level: major
Feb 15 09:59:14.323 2025 lab_MX2020 fpc15 CMError: /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7), scope: pfe, category: functional, severity: major, module: MQSS(1), type: WO: Packet Error

 

Below are logs indicating pfe-diable action due to the cmerror:

Feb 15 09:59:14.347 2025 lab_MX2020 fpc15 Performing action get-state for error /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7) in module: MQSS(1) with scope: pfe category: functional level: major 
Feb 15 09:59:14.359 2025 lab_MX2020 mib2d[18706]: SNMP_TRAP_LINK_DOWN: ifIndex 1325, ifAdminStatus up(1), ifOperStatus down(2), ifName ae62
Feb 15 09:59:14.360 2025 lab_MX2020 mib2d[18706]: SNMP_TRAP_LINK_DOWN: ifIndex 1553, ifAdminStatus up(1), ifOperStatus down(2), ifName et-15/0/7
Feb 15 09:59:14.381 2025 lab_MX2020 fpc15 Performing action cmalarm for error /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7) in module: MQSS(1) with scope: pfe category: functional level: major 
Feb 15 09:59:14.411 2025 lab_MX2020 fpc15 Performing action disable-pfe for error /fpc/15/pfe/0/cm/0/MQSS(1)/1/MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7) in module: MQSS(1) with scope: pfe category: functional level: major 

Solution

The error "MQSS_CMERROR_WO_INT_REG_PKT_ERR (0x220af7)" indicates a packet error due to FI cell error, FO packet error, and FO Output buffer deallocation failure at the MQSS block, causing checksum errors when the packet ingress the EACHIP. Due to this error, congestion was observed on FPC, and a PFE disabled action was performed to avoid traffic blackholing.

 

Collect the following show command outputs to investigate further.

start shell pfe network fpcX (Where X is the FPC slot number reporting issue)
-show syslog messages
-show nvram
-show cmerror module brief
-exit

 
To recover from the PFE disable condition, FPC offline and bring it online again or restart the FPC during a maintenance window.

user@mx> request chassis fpc slot <slot number> offline

Wait for a few minutes.

user@mx> request chassis fpc slot <slot number> online

OR

Execute:

user@mx> request chassis fpc slot <slot number> restart
 

Further Assistance:

If the issue remains unresolved, please contact Juniper Technical Support for further investigation.

Modification History

7/5/2023: Initial Draft

11/03/2025 : Removed old logs that have a customer hostname and updated the KB with new logs.