When attempting to log in to FPCs 6-11 on an MX960 router with enhanced MX SCB, users may observe the " error: command is not valid on the mx960 ​" error.

This article demonstrates how users can obtain the information that they want from the FPC without encountering the above error.

When attempting to log in to FPCs 6-11 on an MX960 router with enhanced MX SCB, the following error is seen:

re0> start shell pfe network fpc10 
error: command is not valid on the mx960​

re0> request pfe execute command "show syslog messages" target fpc10
error: command is not valid on the mx960

When checked, the FPCs status shows that they are online but not mapped in the UI:

re0> show chassis fpc 
                     Temp  CPU Utilization (%)   CPU Utilization (%)  Memory    Utilization (%)
Slot State            (C)  Total  Interrupt      1min   5min   15min  DRAM (MB) Heap     Buffer
  0  Online            32     17          0       18     38     46    2048       32         15
  1  Online            31     18          0       20     38     45    2048       32         15
  2  Online            41     10          0       11     35     45    3200       17         20
  3  Online            40     11          0       12     34     44    3200       17         20
  4  Online            41     11          0       10     32     42    3200       17         20
  5  Empty           
  6  Empty           
  7  Empty           
  8  Online            43     12          0       11     34     44    3200       17         20
  9  Online            44     13          0       12     35     45    3200       17         20
 10  Online            32     17          0       51     45     49    2048       32         16
 11  Online            32    100          1       67     50     52    2048       32         15​

re0> start shell pfe network fpc?
Possible completions:
  fpc0                 Connect to Flexible PIC Concentrator 0
  fpc1                 Connect to Flexible PIC Concentrator 1
  fpc2                 Connect to Flexible PIC Concentrator 2
  fpc3                 Connect to Flexible PIC Concentrator 3
  fpc4                 Connect to Flexible PIC Concentrator 4
  fpc5                 Connect to Flexible PIC Concentrator 5​

To obtain the information that you want from the FPC, use the following workaround from BSD shell:

re0> start shell
% cprod -A fpc10 -c "show jspec client"

 ID       Name
  1       LUCHIP[0]
  2       LUCHIP[4]
  3       XMCHIP[0]
  4       LUCHIP[1]
  5       LUCHIP[5]
  6       XMCHIP[1]

Replace the number of the FPC where you want to execute the command. 

2020-08-06: Article reviewed for accuracy; article relevant and valid; minor changes made
2022-07-24: Article reviewed for accuracy; no changes required; article valid and relevant