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Example: Configuring IP Directed Broadcast on an EX Series Switch

Requirements

This example uses the following software and hardware components:

• Junos OS Release 9.4 or later for EX Series switches
• One PC
• One EX Series switch

Before you configure IP directed broadcast for a subnet:

• Ensure that the subnet does not have a direct connection to the Internet.
• Configure routed VLAN interfaces (RVIs) for the ingress and egress VLANs on the switch. See Configuring Routed VLAN Interfaces (CLI Procedure) or Configuring VLANs for EX Series Switches (J-Web Procedure).

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 1), 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 1: Topology for IP Directed Broadcast

Table 1 shows the settings of the components in this example.

Configuration

To configure IP directed broadcast on a subnet to enable remote management of its hosts:

CLI Quick Configuration

To quickly configure the switch to accept IP directed broadcasts targeted at subnet 10.1.2.1/24, copy the following commands and paste them into the switch’s terminal window:

Step-by-Step Procedure

1. Add logical interface ge-0/0/0.0 to VLAN v1:
   [edit interfaces]
user@switch# set ge-0/0/0.0 family ethernet-switching vlan members v1
2. Add logical interface ge-0/0/1.0 to VLAN v1:
   [edit interfaces]
user@switch# set ge-0/0/1.0 family ethernet-switching vlan members v1
3. Configure the IP address for the egress VLAN, v1:
   [edit interfaces]
user@switch# set vlan.1 family inet address 10.1.2.1/24
4. Add logical interface ge-0/0/3.0 to VLAN v0:
   [edit interfaces]
user@switch# set ge-0/0/3.0 family ethernet-switching vlan members v0
5. Configure the IP address for the ingress VLAN:
   [edit interfaces]
user@switch# set vlan.0 family inet address 10.1.1.1/24
6. To route traffic between the ingress and egress VLANs, associate a Layer 3 interface with each VLAN:
   [edit vlans]
user@switch# set v1 l3-interface (VLANs)vlan.1
user@switch# set v0 l3–interface vlan.0
7. Enable the Layer 3 interface for the egress VLAN to receive IP directed broadcasts:
   [edit interfaces]
user@switch# set vlan.1 family inet targeted-broadcast

Results

Check the results: