Juniper EX4200 Hardware Manual page 222

Ensured that the operational modes of the uplink modules on the existing member switch and the new
member switch match.
Confirmed that the new member switch is powered off.
If the preceding conditions are not met, autoprovisioning will not work and you will need to manually
configure uplink module ports on the switch to be added to the configuration to be VCPs. For more
information, see Setting an Uplink Port on an EX Series or QFX Series Switch as a Virtual Chassis Port.
To add a switch to an existing preprovisioned Virtual Chassis configuration using the autoprovisioning
feature:
1. Interconnect the unpowered new switch to one member of the existing Virtual Chassis configuration.
Only connect one VCP on the unpowered new switch to a VCP on a member switch in the existing
Virtual Chassis at this point of the procedure.
2. Power on the new member switch.
3. Confirm that the new member switch is now included in the Virtual Chassis configuration by checking
the front-panel LCD for the member ID. It should display a member ID in the range from 0 through 9.
The member ID is automatically assigned to the new member switch's serial number in the configuration
file.
4. Cable the other VCP on the new member switch to the Virtual Chassis.
CAUTION:
Virtual Chassis at the same time, a member switch that was already part of the
Virtual Chassis might become nonoperational for several seconds. Network traffic
to this switch is dropped during the downtime.
The member switch will return to the normal operational state with no user
intervention, and normal operation of the Virtual Chassis will resume after this
downtime.
SEE ALSO
Example: Expanding an EX4200 Virtual Chassis in a Single Wiring Closet
Example: Setting Up a Multimember EX4200 Virtual Chassis Access Switch with a Default Configuration
Example: Configuring an EX4200 Virtual Chassis Interconnected Across Multiple Wiring Closets
Example: Configuring an EX4200 Virtual Chassis Using a Preprovisioned Configuration File
If you immediately cable both VCPs on the new switch into the existing
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