Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1109

Configuring Graceful Routing Engine Switchover in an EX4200 Virtual Chassis (CLI
Procedure)
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Copyright © 2010, Juniper Networks, Inc.
In an EX4200 Virtual Chassis configuration, one member switch is assigned the master
role and has the master Rouing Engine. Another member switch is assigned the backup
role and has the backup Routing Engine. Graceful Routing Engine switchover (GRES)
enables the master and backup Routing Engines in a Virtual Chassis configuration to
switch from the master to backup without interruption to packet forwarding. When you
configure graceful Routing Engine switchover, the backup Routing Engine automatically
synchronizes with the master Routing Engine to preserve kernel state information and
the forwarding state.
To set up an EX4200 Virtual Chassis configuration to use graceful Routing Engine
switchover (GRES):
Set up a minimum of two EX 4200 switches in a Virtual Chassis configuration with
1.
mastership priority of 255:
[edit]
user@switch# set virtual-chassis member 0 mastership-priority 255
[edit]
user@switch# set virtual-chassis member 1 mastership-priority 255
Set up graceful Routing Engine switchover:
2.
[edit]
user@switch# set chassis redundancy graceful-switchover
Commit the configuration.
Example: Configuring an EX4200 Virtual Chassis with a Master and Backup in a Single
Wiring Closet on page 917
Configuring an EX4200 Virtual Chassis (CLI Procedure) on page 981
Configuring an EX4200 Virtual Chassis (J-Web Procedure) on page 985
High Availability Features for EX Series Switches Overview on page 23
Understanding EX4200 Virtual Chassis Configuration on page 904
For more information about graceful Routing Engine switchover, see the Junos OS High
Availability Configuration Guide at
http://www.juniper.net/techpubs/software/junos/index.html
Chapter 39: Configuring EX4200 Virtual Chassis
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