Remove A Member Switch, Replace It With A Different Switch, And Reapply The Old Configuration - Juniper EX4200 Hardware Manual

2. Repair, as necessary.
3. Reconnect the switch and power it on.

Remove a Member Switch, Replace It with a Different Switch, and Reapply the Old Configuration

If you are unable to repair a member switch, you can replace it with a different member switch of the same
type while retaining the previous configuration. The primary stores the configuration of the member switch
that was removed. When you connect a different member switch, the primary assigns a new member ID,
but the old configuration is still stored under the previous member ID of the previous member switch.
To remove and replace a switch and reapply the old configuration:
1. Power off and disconnect the member switch to be replaced.
NOTE: See Step
Reassignment to a Different Switch" on page 224
Chassis settings from the removed switch if you want to use that switch in a different
configuration.
2. If the replacement member switch has been previously configured, revert that switch's configuration
to the factory defaults. See the request system zeroize command.
The replacement member switch should be powered on and running with the factory default
configuration at the end of this step.
3. (Recommended for a QFX5100 Virtual Chassis under certain conditions) When you add or replace a
QFX5100-24Q switch that is configured in the Routing Engine role in a QFX5100 Virtual Chassis, if
the new switch has two EX4600-EM-8F expansion modules, we recommend that you set the primary
role priorities on the routing engine members and the new switch to prevent a primary-role switchover
to the new switch until after the new switch is completely initialized in the Virtual Chassis.
Before interconnecting the new switch into the Virtual Chassis in this case, see Add or Replace a
QFX5100-24Q Switch with Two Expansion Modules in a QFX5100 Virtual Chassis for details on why,
when, and how you should do this step.
NOTE: You might need to do this even if the new switch has the default factory configuration.
4. (Required when automatic software update is not enabled on the Virtual Chassis and the new member
switch is running a version of Junos OS that is different than the version of Junos OS running on the
7 in "Remove a Member Switch and Make Its Member ID Available for
for information on how to disable Virtual
226