Juniper JUNOS OS 10.3 - SOFTWARE, Manual

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Virtual Chassis configuration, it is also the master. When you interconnect a standalone
switch to an existing Virtual Chassis configuration (which implicitly includes its own
master), we recommend that you explicitly configure the mastership priority of the
members that you want to function as the master and backup.
We recommend that you specify the same mastership priority value for both the master
and backup members.
NOTE: Configuring the same mastership priority value for both the master
and backup helps to ensure a smooth transition from master to backup in
case the master becomes unavailable. It prevents the old master from
preempting control from the backup in situations where the backup has taken
control of the Virtual Chassis configuration due to the original master being
unavailable.
We also recommend that you configure the highest possible mastership priority value
(255) for those two members, because that guarantees that these two members continue
to function as the master and backup when other members are added to the Virtual
Chassis configuration. Any other members of the Virtual Chassis configuration (members
with lower mastership priority) are considered linecard members.
In a preprovisioned configuration, the mastership priority value is assigned by the software,
based on the specified role.
Virtual Chassis Identifier (VCID)
All members of a Virtual Chassis configuration share one Virtual Chassis identifier (VCID).
This identifier is derived from internal parameters. When you are monitoring a Virtual
Chassis configuration, the VCID is displayed in the user interface.
Related
Documentation
Virtual Chassis Overview on page 921
•
•
Example: Configuring a Virtual Chassis with a Master and Backup in a Single Wiring
Closet on page 947
•
Example: Configuring a Virtual Chassis Interconnected Across Multiple Wiring Closets
on page 963
•
Example: Configuring a Virtual Chassis Using a Preprovisioned Configuration File on
page 982
•
Setting an Uplink Module Port as a Virtual Chassis Port (CLI Procedure) on page 1023
•
Command Forwarding Usage with a Virtual Chassis Configuration on page 1035
927 Copyright © 2010, Juniper Networks, Inc.
Chapter 43: Virtual Chassis—Overview, Components, and Configurations