It would be much more helpful to indicate which EX series switches you have and the version of Junos OS
By default, uplink ports 2 and 3 on EX3300 switches are configured as VCPs.
EX2200, EX2300, EX3300, and EX3400 switches do not have dedicated VCPs. You must always use the uplink ports on an EX2200, EX2300, EX3300, or EX3400 switch to connect the Virtual Chassis both within a wiring closet and across wiring closets. Uplink ports 2 and 3 are automatically configured as VCPs on EX3300 switches. All QFSP+ ports on EX3400 switches are configured as VCPs by default. No uplink ports on EX2200 or EX2300 switches are automatically configured as VCPs. You can configure SFP ports on EX2200 switches and SFP+ ports on EX2300s as VCPs.
All the information on these links explains all you need:
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/virtual-chassis-ex4200-uplink-vcp-cli.html
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/virtual-chassis-ex2200-setting-vcp.html
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Re: Configuring Uplink Port as VCP port for Virtual chasis and member ID
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