This article explains why the log message "AC200_DCFP2:ac200_dcfp2_monitor_init register sub error" is seen after a new MPC card is installed on MX Series routers.

When a new card (MPC5E 3D Q, in this case) is inserted into member1 fpc slot 10, the following logs can be observed on member1 RE0, which is the primary RE. The logs are shown a few times:

Nov 17 03:15:59.250 2020 MX-VC-member1-re0 : %PFE-6: member1-fpc10 AC200_DCFP2:ac200_dcfp2_monitor_init register sub error (131073) for errorid 0x1b0001 (CFP2 Laser End Of Life) for module for port 0. 
Nov 17 03:15:59.424 2020 MX-VC-member1-re0 : %PFE-6: member1-fpc10 AC200_DCFP2:ac200_dcfp2_monitor_init register sub error (131073) for errorid 0x1b0002 (CFP2 Module Fault) for module for port 0.
Nov 17 03:15:59.592 2020 MX-VC-member1-re0 : %PFE-6: member1-fpc10 AC200_DCFP2:ac200_dcfp2_monitor_init register sub error (131073) for errorid 0x1b0003 (CFP2 Power Supply Fault) for module for port 0.

Perform the following:

1. Use show chassis hardware detail all-members to check the CFP model, and confirm with Juniper if this CFP has reached End of Life.

In the following output, CFP2-100G-LR4 has not reached EOL yet.

MX-VC-re0>show chassis hardware detail all-members

FPC 10   REV 60   750-046005   CAPV2110    MPC5E 3D Q 2CGE+4XGE
CPU      REV 13   711-045719   CAPV0201    RMPC PMB
PIC 0             BUILTIN      BUILTIN     2X10GE SFPP OTN
PIC 1             BUILTIN      BUILTIN     1X100GE CFP2 OTN
Xcvr 0   REV 01   740-052504   UUH0Q57     CFP2-100G-LR4
PIC 2             BUILTIN      BUILTIN     2X10GE SFPP OTN
PIC 3             BUILTIN      BUILTIN     1X100GE CFP2 OTN
Xcvr 0   REV 01   740-052504   UUH0Q5D     CFP2-100G-LR4

2. Use show chassis pic member 1 fpc-slot 10 pic-slot x ( x is the PIC-slot number) to check each PIC.

3. Use show interface diagnostics optics et-22/ x /0 ( x is PIC-slot number) to check if there is "Laser end-of-life alarm" on the interface.

4. After confirming that the CFP module is not EOL, check the log messages to see if they are appearing again.

If they are appearing only when CFP is being initialized, then we can confirm that they are informational only.

These logs are expected when CFP is at the initializing phase, and so they can be safely ignored. These are informational messages or trace messages at the initializing phase of hardware CFP, when a new part is installed. 

If the MPC and CFP are installed on chassis member0, then these logs should be shown as part of the log message on the primary Routing Engine on the member0 chassis. 

Note: These log messages are not seen in Junos OS Release 18.2 and later.

2020-11-25: Minor change made