Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1041

Related
Documentation
Understanding Automatic Software Update on Virtual Chassis Member Switches
Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
NOTE: When you merge two Virtual Chassis that had not previously been
part of the same Virtual Chassis configuration, any configuration settings
(such as the settings for Telnet/FTP services, GRES, fast failover, VLANs,
and so on) that exist on the new master will become the configuration settings
for all members of the new Virtual Chassis, overwriting any other configuration
settings.
Understanding Virtual Chassis Configuration on page 934
Example: Assigning the Virtual Chassis ID to Determine Precedence During a Virtual
Chassis Merge on page 997
Assigning the Virtual Chassis ID to Determine Precedence During a Virtual Chassis
Merge (CLI Procedure) on page 1031
Disabling Split and Merge in a Virtual Chassis Configuration (CLI Procedure) on page 1031
The automatic software update feature automatically updates the Juniper Networks
Junos operating system (Junos OS) version on prospective member switches as they are
added to a Virtual Chassis configuration of Juniper Networks EX4200 Ethernet Switches
so the new member switch immediately joins the Virtual Chassis configuration and is put
in the active state.
For a standalone EX4200 switch to join an existing Virtual Chassis configuration, it must
be running the same version of Junos OS that is running on the Virtual Chassis master.
When the master in a Virtual Chassis configuration detects that a new switch has been
added to the configuration, it checks the software version on the new switch. If the
software version on the new switch is not the same as the version running on the master,
the master keeps the new switch in the inactive state. If you have not enabled the
automatic software update feature, you will have to manually install the correct software
version on each prospective member switch as it is added to the Virtual Chassis
configuration.
Understanding Software Upgrade in a Virtual Chassis Configuration on page 928
Example: Configuring Automatic Software Update on Virtual Chassis Member Switches
on page 1007
Configuring Automatic Software Update on Virtual Chassis Member Switches (CLI
Procedure) on page 1032
Chapter 43: Virtual Chassis—Overview, Components, and Configurations
945