Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1027

Overview and Topology
Copyright © 2010, Juniper Networks, Inc.
One EX4200-24P switch
One XFP uplink module
Before you begin, be sure you have confirmed that the existing EX4200 Virtual Chassis
configuration is operating correctly. See "Example: Configuring an EX4200 Virtual Chassis
with a Master and Backup in a Single Wiring Closet" on page 917.
A Virtual Chassis configuration can be expanded without disrupting the site's network
connectivity. This example describes adding a member switch to an existing Virtual
Chassis configuration to provide additional access ports for connecting more PCs and
VoIP phones at this location. You can continue to expand the Virtual Chassis configuration
with additional members in the same wiring closet, using the same procedure. If you want
to expand the Virtual Chassis configuration to include member switches in another wiring
closet, see "Example: Configuring an EX4200 Virtual Chassis Interconnected Across
Multiple Wiring Closets" on page 932.
If you want to retain the roles of the existing master and backup switches, explicitly
configure the mastership priority of these switches, specifying the highest possible value
(255) for both the master and the backup.
During expansion, the existing Virtual Chassis configuration can remain powered on and
connected to the network. Before powering up the new switch, interconnect it to the
other the switches using the dedicated VCPs on the rear panel. Do not run the EZSetup
program on the added member switch.
This example shows an existing Virtual Chassis configuration composed of two EX4200
switches. The Virtual Chassis configuration is being expanded to include a EX4200-24P
switch as a linecard member.
The topology for this example consists of:
One EX4200-48P switch (SWA-0) with 48 access ports, all of which support Power
over Ethernet (PoE)
One EX4200-24T switch (SWA-1) with 24 access ports, including eight ports that
support PoE
One EX4200-24P switch (SWA-2) with 24 access ports, all of which support PoE
One uplink module with two 10-gigabit ports is installed in the EX4200-48P switch.
These ports can be configured as trunk ports to connect to a distribution switch or
customer edge (CE) router or as Virtual Chassis ports (VCPs) to interconnect with a
member switch that is located too far for dedicated VCP cabling. (The uplink module
ports on the SFP and SFP+ uplink modules and the SFP network interfaces on the
EX4200-24F switches can also be used for these purposes.) For information on
configuring the uplink ports as trunk ports to a distribution switch, see "Configuring
Gigabit Ethernet Interfaces (CLI Procedure)" on page 1284 or "Configuring Gigabit Ethernet
Interfaces (J-Web Procedure)" on page 1287. For information on configuring uplink ports
as Virtual Chassis ports, see "Setting an EX4200 Switch Uplink Module Port as a Virtual
Chassis Port (CLI Procedure)" on page 994.
Chapter 38: EX4200 Virtual Chassis—Configuration Examples
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