Adding A New Switch To An Existing Preprovisioned Virtual Chassis Using Autoprovisioning And Automatic Vcp Conversion - Juniper EX4200 Hardware Manual

Adding a New Switch to an Existing Preprovisioned Virtual Chassis Using Autoprovisioning and
Automatic VCP Conversion
This procedure can be used to add an EX4200 switch to an existing EX4200 Virtual Chassis using
autoprovisioning, where after the new switch is provisioned and cabled into the Virtual Chassis, the
interconnecting links automatically convert into VCP links.
Before you begin, be sure you have:
Installed the uplink modules needed for the Virtual Chassis configuration.
Mounted the new switch in a rack.
Ensured that the preprovisioned Virtual Chassis configuration has an active primary switch. For more
information, see Example: Configuring an EX4200 Virtual Chassis Using a Preprovisioned Configuration File.
On the primary switch, configured the Link Level Discovery Protocol (LLDP) on the uplink module ports
that will be used as VCPs. LLDP is configured by default but might have been disabled. Both sides of
the new links exchange LLDP messages to accomplish automatic VCP conversion. To configure LLDP,
see Configuring LLDP (CLI Procedure).
Ensured that the new member switch has the factory-default configuration. If the new member switch
has been previously configured, revert its configuration to the factory defaults. See Reverting to the
Default Factory Configuration for the EX Series Switch.
Made a note of the serial number (the number is on the back of the switch). You will need to edit the
Virtual Chassis configuration to include the serial number of the new member switch.
Edited the existing Virtual Chassis preprovisioned configuration to include the serial number of the new
member switch. The parameters specified in the primary Virtual Chassis configuration file are applied
to the new member switch after it has been interconnected through its uplink VCP to an existing member
switch.
Prepared an existing member switch to interconnect with the new switch through an uplink module port
by ensuring that port is not set as a VCP. One of the conditions for automatic VCP conversion to be
invoked is that the ports on both sides of the new link must not already be configured as VCPs.
CAUTION:
switches that have dedicated VCPs (EX4200, EX4500, or EX4550 Virtual Chassis),
if network or uplink ports are automatically converted into VCPs to create a redundant
link with a dedicated VCP connection between the same two Virtual Chassis members,
you must reboot the Virtual Chassis to avoid creating a traffic loop within the Virtual
Chassis. (The same issue can occur even if the ports are manually converted into
VCPs to create the redundant VCP link with a dedicated VCP link, so the reboot is
required to avoid traffic looping in that case as well.)
When automatic VCP conversion is enabled in a Virtual Chassis with
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