This article explains the meaning of the log message "RT:correct0_protect_intr: 0x1: Fatal LMEM Error" that may be seen on PTX and QFX Series devices, and the steps to recover from such errors.

The following error messages are seen in the log file.

Nov 23 14:38:00  router-name : %PFE-3: fpc0 Cmerror Op Set: PE Chip: pe4[4]: RT:correct0_protect_intr: 0x1: Fatal LMEM Error. 1 bit for each GN slice MEM:lmem , MEMTYPE: 2,ADDR : [h2e00000, h2c00000,h2a00000, h2800000],  
Nov 23 14:39:19  router-name : %PFE-3: fpc0 Cmerror Op Clear: PE Chip: pe4[4]: RT: Clear Fatal LMEM Error. 1 bit for each GN slice MEM:lmem , MEMTYPE: 2,ADDR : [h2e00000, h2c00000,h2a00000, h2800000],  

These logs indicate an error in the RT (Request Table) local memory and are correctable by the system. The Request Table stores requests (for egress Packet Forwarding Engine) coming from Fabric / LX switch paths and enqueues these requests into "GrantScheduler".

These errors are usually corrected and if these errors are not persistent, such an instance can be ignored.

If the errors are persistent, it could be an indication of an underlying hardware issue. In such a case, reboot the FPC and check if the errors stop appearing. If a reboot does not fix the problem, contact Support for further investigation.

19-11-2025: Minor, non-technical edit