Configuring Ip Directed Broadcast (Cli Procedure) - Juniper EX2200 Hardware Manual

Network Interfaces for EX4300 Switches

Configuring IP Directed Broadcast (CLI Procedure)

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NOTE: This task uses Junos OS for EX Series switches with support for the
Enhanced Layer 2 Software (ELS) configuration style. If your switch runs
software that does not support ELS, see Configuring IP Directed Broadcast
(CLI Procedure). For ELS details, see Getting Started with Enhanced Layer 2
Software.
You can use IP directed broadcast on an EX Series switch to facilitate remote network
management by sending broadcast packets to hosts on a specified subnet without
broadcasting to the entire network. IP directed broadcast packets are broadcast on only
the target subnet. The rest of the network treats IP directed broadcast packets as unicast
packets and forwards them accordingly.
Before you begin to configure IP directed broadcast:
Ensure that the subnet on which you want broadcast packets using IP direct broadcast
is not directly connected to the Internet.
Configure an integrated routing and bridging (IRB) interface or routed VLAN interface
(RVI) for the subnet that will be enabled for IP direct broadcast. See Configuring
Integrated Routing and Bridging Interfaces (CLI Procedure), Configuring Routed VLAN
Interfaces (CLI Procedure) , or Configuring VLANs for EX Series Switches (J-Web
Procedure).
NOTE: We recommend that you do not enable IP directed broadcast on
subnets that have a direct connection to the Internet because of increased
exposure to denial-of-service (DoS) attacks.
To enable IP directed broadcast for a specified subnet:
Add the target subnet's logical interfaces to the VLAN:
1.
[edit interfaces]
user@switch# set ge-0/0/0.0 family ethernet-switching vlan
user@switch# set ge-0/0/1.0 family ethernet-switching vlan members v1
Configure the Layer 3 interface on the VLAN that is the target of the IP directed
2.
broadcast packets:
[edit interfaces]
user@switch# set irb.1 family inet address 10.1.2.1/24
Associate a Layer 3 interface with the VLAN:
3.
[edit vlans]
user@switch# set v1 l3-interface (VLANs) irb.1
Enable the Layer 3 interface for the VLAN to receive IP directed broadcasts:
4.
[edit interfaces]
user@switch# set irb.1 family inet targeted-broadcast
members v1
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