On a MX480 (MX-VC setup) router with MPC10E-3D-MRATE-10xQSFPP card connected, we have seen partial of the 'et' interfaces are not detected on the member-1 of the chassis. The 'et' interfaces are not detected when we check the output of "show chassis hardware detail" & "show interface terse".

Config:

set chassis member 1 fpc 5 pic 0 port 0 speed 100g

set chassis member 1 fpc 5 pic 0 port 1 speed 100g

set chassis member 1 fpc 5 pic 0 port 2 speed 100g

set chassis member 1 fpc 5 pic 0 port 3 speed 100g

set chassis member 1 fpc 5 pic 0 port 4 speed 100g

As per the setup MPC10E card is connected on member 1 of the chassis, and the SFP's are connected on the port 0, 1, 2, 3 and 4.

However the following ports are not detected on the chassis: et-5/0/2, et-5/0/3, et-5/0/4, et-17/0/2, et-17/0/3, et-17/0/4.

Workaround:

We tried changing the 'port speed' to 'PIC-mode' speed config and then the missing interfaces are detected on the chassis.

#set chassis member 1 fpc 1 pic 1 pic-mode 100G

https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet/topics/topic-map/port-speed-configuration-1.html

https://www.juniper.net/documentation/us/en/hardware/mx-module-reference/topics/concept/mpc10e-15c-mrate.html

https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/pic-mode-edit-chassis-mx-series.html