Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1129

Configuring Graceful Routing Engine Switchover in a Virtual Chassis Configuration
(CLI Procedure)
Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
In a 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 forwarding state.
To set up a 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 a Virtual Chassis with a Master and Backup in a Single Wiring
Closet on page 947
Configuring a Virtual Chassis (CLI Procedure) on page 1011
Configuring a Virtual Chassis (J-Web Procedure) on page 1015
High Availability Features for EX Series Switches Overview on page 20
Understanding Virtual Chassis Configuration on page 934
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 45: Configuring Virtual Chassis
.
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