Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1630

Complete Software Guide for Junos
Overview and Topology
Table 224: Components of the Basic Bridging Configuration Topology
Property
Switch hardware
VLAN name
Connection to wireless access point (requires PoE)
1526
®
OS for EX Series Ethernet Switches, Release 10.4
Junos OS Release 9.0 or later for EX Series switches
One EX4200 Virtual Chassis switch
Before you set up bridging and a VLAN, be sure you have:
Installed the switch. See installation instructions for your switch.
Performed the initial switch configuration. See "Connecting and Configuring an EX
Series Switch (J-Web Procedure)" on page 201.
EX Series switches connect network devices in an office LAN or a data center LAN to
provide sharing of common resources such as printers and file servers and to enable
wireless devices to connect to the LAN through wireless access points. Without bridging
and VLANs, all devices on the Ethernet LAN are in a single broadcast domain, and all the
devices detect all the packets on the LAN. Bridging creates separate broadcast domains
on the LAN, creating VLANs, which are independent logical networks that group together
related devices into separate network segments. The grouping of devices on a VLAN is
independent of where the devices are physically located in the LAN.
To use an EX Series switch to connect network devices on a LAN, you must, at a minimum,
configure bridging and VLANs. If you simply power on the switch and perform the initial
switch configuration using the factory-default settings, bridging is enabled on all the
switch's interfaces, all interfaces are in access mode, and all interfaces belong to a VLAN
called , which is automatically configured. When you plug access devices—such
default
as desktop computers, Avaya IP telephones, file servers, printers, and wireless access
points—into the switch, they are joined immediately into the
is up and running.
The topology used in this example consists of one EX4200-24T switch, which has a total
of 24 ports. Eight of the ports support Power over Ethernet (PoE), which means they
provide both network connectivity and electric power for the device connecting to the
port. To these ports, you can plug in devices requiring PoE, such as Avaya VoIP telephones,
wireless access points, and some IP cameras. (Avaya phones have a built-in hub that
allows you to connect a desktop PC to the phone, so the desktop and phone in a single
office require only one port on the switch.) The remaining 16 ports provide only network
connectivity. You use them to connect devices that have their own power sources, such
as desktop and laptop computers, printers, and servers. Table 224 on page 1526 details
the topology used in this configuration example.
default
Settings
EX4200-24T switch, with 24 Gigabit Ethernet ports: 8 PoE
ports ( through
ge-0/0/0 ge-0/0/7
( through
ge-0/0/8 ge-0/0/23
default
ge-0/0/0
Copyright © 2010, Juniper Networks, Inc.
VLAN and the LAN
) and 16 non-PoE ports
)