400G Port Not Coming Up on ACX7100

If we are using 8*50G break out cable for 4x100G SFP, it won’t work.

Customer need to use 4*100G break out cable for the port.

The 8*50G break out is supported only for 8x50G SFP.

As per the config shared, you were adding 4*100G sub-port, which is for a 4x100G SFP.

Hence you cannot use 8*50G break out on a 4x100G SFP.

Also the recommendation from JTAC will be to use Juniper qualified SFP, instead of non-Juniper one & 4*100G cable.

Below is the link for supported SFPs in the platform.

https://apps.juniper.net/hct/product/?cat=Transceivers&prd=ACX7100-32C