Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1157

role
Syntax
Hierarchy Level
Release Information
Description
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Copyright © 2010, Juniper Networks, Inc.
role (routing-engine | line-card);
[edit virtual-chassis preprovisioned member member-id]
Statement introduced in Junos OS Release 9.0 for EX Series switches.
In a preprovisioned Virtual Chassis configuration, specify the role to be performed by
each EX4200 member switch. Associate the role permanently with the member's serial
number.
routing-engine —Enables the member eligible to function as a master or backup of the
Virtual Chassis configuration. The master manages all the members of the Virtual
Chassis configuration and runs the chassis management processes and control
protocols. The backup synchronizes with the master in terms of protocol states,
forwarding tables, and so forth, so that it is prepared to preserve routing information
and maintain network connectivity without disruption in case the master is
unavailable.
Specify two and only two members as routing-engine. The software determines which
of the two members assigned the routing-engine role functions as master, based on
the master election algorithm. See "Understanding How the Master in a Virtual
Chassis Configuration Is Elected" on page 928.
—Enables the member to be eligible to function only in the linecard role. Any
line-card
member of the Virtual Chassis configuration other than the master or backup
functions in the linecard role and runs only a subset of Junos OS for EX Series
switches. A member functioning in the linecard role does not run the chassis control
protocols. A Virtual Chassis configuration must have at least three members in order
to include a member that functions in the linecard role.
When you use a preprovisioned configuration, you cannot modify the mastership priority
or member ID of member switches through the user interfaces. The mastership
priority value is generated by the software, based on the assigned role:
A member configured as
A member configured as
A member listed in the preprovisioned configuration without an explicitly specified role
is assigned the mastership priority
The configured role specifications are permanent. If both
fail, a member cannot take over as master of the Virtual Chassis
line-card
configuration. You must delete the preprovisioned configuration in order to change
the specified roles.
It is possible to explicitly configure two members as
additional switches as members of the preprovisioned Virtual Chassis by specifying
only their serial numbers. If you do not explicitly configure the role of the additional
Chapter 48: Configuration Statements for Virtual Chassis
routing-engine is assigned the mastership priority
is assigned the mastership priority
line-card
128 .
routing-engine
129 .
.
0
members should
routing-engine
and to configure
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