Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1104

Complete Software Guide for Junos
Configuring the Timer for the Backup Member to Start Using Its Own MAC Address, as
Master of the EX4200 Virtual Chassis (CLI Procedure)
Related
Documentation
1000
®
OS for EX Series Ethernet Switches, Release 10.4
When a backup member takes control of an EX4200 Virtual Chassis configuration because
of a reset or other temporary failure, the backup uses the MAC address of the old master.
This helps to ensure a smooth transition of mastership with no disruption to network
connectivity.
The MAC persistence timer is used in situations in which the master is no longer a member
of the Virtual Chassis configuration because it has been physically disconnected or
removed. If the old master does not rejoin the Virtual Chassis configuration before the
timer elapses, the new master starts using its own MAC address.
The default timer value is 10 minutes. There are no minimum or maximum limits.
Before you begin configuring the timer, ensure that you have at least two member switches
in the Virtual Chassis configuration.
To configure or modify the MAC persistence timer:
[edit virtual-chassis]
user@switch# set mac-persistence-timer 30
This example modifies the MAC persistence timer value to specify a timer value of 30
minutes rather than the default timer value of 10 minutes.
Configuring an EX4200 Virtual Chassis (CLI Procedure) on page 981
Configuring an EX4200 Virtual Chassis (J-Web Procedure) on page 985
Understanding EX4200 Virtual Chassis Components on page 893
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