Juniper JUNOS OS 10.3 - SOFTWARE, Manual

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Overview and Topology
You might want to perform remote administration tasks such as backups and
wake-on-LAN (WOL) application tasks to manage groups of clients on a subnet. One
way to do this is to send IP directed broadcast packets targeted at the hosts in a particular
target subnet.
The network forwards IP directed broadcast packets as if they were unicast packets.
When the IP directed broadcast packet is received by a VLAN that is enabled for
targeted-broadcast
, the switch broadcasts the packet to all the hosts in its subnet.
In this topology (see Figure 27 on page 1139), a host is connected to an interface on an EX
Series switch to manage the clients in subnet
10.1.2.1/24
. When the switch receives a
packet with the broadcast IP address of the target subnet as its destination address, it
forwards the packet to the subnet’s Layer 3 interface and broadcasts it to all the hosts
within the subnet.
Figure 27: Topology for IP Directed Broadcast
Table 165 on page 1139 shows the settings of the components in this example.
Table 165: Components of the IP Directed Broadcast Topology
Settings Property
EX Series switch Switch hardware
v0 Ingress VLAN name
10.1.1.1/24
Ingress VLAN IP address
v1
Egress VLAN name
10.1.2.1/24 Egress VLAN IP address
ge-0/0/3.0
Interfaces in VLAN
v0
ge-0/0/0.0 and ge-0/0/1.0 Interfaces in VLAN v1
Configuration
To configure IP directed broadcast on a subnet to enable remote management of its
hosts:
1139 Copyright © 2010, Juniper Networks, Inc.
Chapter 51: Examples: Interfaces Configuration