This article describes the error seen when configuring virtual chassis ports on EX4300-MP switches.

If you try to configure VC ports on EX4300-MP devices, the following error is seen:

{master:0}
root> request virtual-chassis vc-port set pic-slot 1 port 3
error: Invalid PIC slot / PIC port

In EX4300-48MP and EX4300-48MP-S switches, you can use only the built-in QSFP+ ports as VCPs to connect the switch in a Virtual Chassis. You cannot configure the ports on the uplink module in EX4300-48MP and EX4300-48MP-S switches to Virtual Chassis ports (VCPs). You cannot configure the built-in QSFP+ ports as network ports. By default, the built-in QSFP+ ports are dedicated VCPs.  

2025-01-09: Article created

2025-01-10: Article validated

https://www.juniper.net/documentation/us/en/hardware/ex4300/topics/topic-map/ex4300-system-overview.html#jd0e385