Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1044

Complete Software Guide for Junos
Requirements
Overview and Topology
948
®
OS for EX Series Ethernet Switches, Release 10.3
This example describes how to configure a Virtual Chassis with a master and backup in
a single wiring closet:
Requirements on page 948
Overview and Topology on page 948
Configuration on page 950
Verification on page 950
Troubleshooting the Virtual Chassis on page 952
This example uses the following hardware and software components:
Junos OS Release 9.0 or later for EX Series switches
One EX4200-48P switch
One EX4200-24T switch
One XFP uplink module
Before you begin, be sure you have:
Rack-mounted the switches. See Mounting an EX3200 or EX4200 Switch on Two
1.
Posts in a Rack or Cabinet or Mounting an EX3200 or EX4200 Switch on Four Posts
in a Rack or Cabinet or Mounting an EX3200 or EX4200 Switch on a Desk or Other
Level Surface.
Installed the uplink module. See Installing an Uplink Module in an EX3200 or EX4200
2.
Switch.
Cabled the switches. See Connecting a Virtual Chassis Cable to an EX4200 Switch.
3.
A Virtual Chassis configuration allows you to accommodate the networking needs of a
growing office. The default configuration of a two-member Virtual Chassis includes a
master and a backup switch. In addition to providing more access ports than a single
EX4200 switch can provide, a Virtual Chassis configuration provides high availability
through redundancy.
This example shows a Virtual Chassis configuration composed of two EX4200 switches.
One of the switches has an uplink module with ports that can be configured to connect
to a distribution switch or customer edge (CE) router or that can be configured as Virtual
Chassis ports (VCPs) to interconnect with a member switch that is located too far for
the dedicated VCP cabling. (The network interfaces on EX4200-24F switches can also
be configured as VCPs.) For information on configuring the uplink ports as trunk ports to
a distribution switch, see "Configuring Gigabit Ethernet Interfaces (CLI Procedure)" on
page 1153. For an example of configuring uplink ports as VCPs, see "Example: Configuring
a Virtual Chassis Interconnected Across Multiple Wiring Closets" on page 963.
By default, after you interconnect the switches with the dedicated VCPs and power on
the switches, the VCPs are operational. The mastership priorities and member IDs are
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