Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1054

Complete Software Guide for Junos
Requirements
Overview and Topology
958
®
OS for EX Series Ethernet Switches, Release 10.3
configuration to enable these ports. They are operational by default. The Virtual Chassis
configuration automatically assigns the master, backup, and linecard roles, based on the
sequence in which the switches are powered on and other factors in the master election
algorithm. See "Understanding How the Master in a Virtual Chassis Configuration Is
Elected" on page 928.
TIP: We recommend that you explicitly configure the mastership priority of
the switches to ensure that the switches continue to perform the desired
roles when additional switches are added or other changes occur. However,
it is possible to use the default configuration described in this example.
This example describes how to configure a multimember Virtual Chassis in a single wiring
closet, using the default role assignments:
Requirements on page 958
Overview and Topology on page 958
Configuration on page 959
Verification on page 960
Troubleshooting on page 962
This example uses the following hardware and software components:
Junos OS Release 9.0 or later for EX Series switches
Two EX4200-48P switches
Four EX4200-24P switches
A Virtual Chassis configuration is easily expandable. This example shows a Virtual Chassis
configuration composed of six EX4200 switches. It provides networking access for 180
onsite workers, who are sitting within range of a single wiring closet. The six combined
switches are identified by a single host name and managed through a global management
IP address.
To set up a multimember Virtual Chassis configuration within a single wiring closet, you
need to run the EZ Setup program only once. Connect to the master and run EZ Setup
to specify its identification, time zone, and network properties. When additional switches
are connected through the Virtual Chassis ports (VCPs), they automatically receive the
same properties that were specified for the master.
The topology for this example (see Figure 18 on page 959) consists of six switches:
Two EX4200-48P switches (SWA-0 and SWA-1) with 48 access ports, all of which
support Power over Ethernet (PoE)
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