Ip Directed-Broadcast - Allied Telesis SwitchBlade x908 Series Software Reference Manual

IP Addressing and Protocol Commands

ip directed-broadcast

ip directed-broadcast Command
Use this command to enable flooding of directed broadcast packets into a directly connected
subnet. If this command is configured on a VLAN interface, then directed broadcasts received
on other VLAN interfaces, destined for the subnet on this VLAN, will be flooded to the subnet
broadcast address of this VLAN.
Use the no parameter with this command to disable ip directed-broadcast. When this
feature is disabled using no ip directed-broadcast, directed broadcasts are not forwarded.
Syntax
ip directed-broadcast
no ip directed-broadcast
The ip directed-broadcast command is disabled by default.
Default
IP directed-broadcast is enabled and disabled per VLAN interface. When enabled a directed
Usage
broadcast packet is forwarded to an enabled VLAN interface if received on another subnet.
An IP directed broadcast is an IP packet whose destination address is a broadcast address for
some IP subnet, but originates from a node that is not itself part of that destination subnet.
When a directed broadcast packet reaches a switch that is directly connected to its destination
subnet, that packet is flooded as a broadcast on the destination subnet.
The ip directed-broadcast command controls the flooding of directed broadcasts when
they reach target subnets. The command affects the final transmission of the directed broadcast
on its destination subnet. It does not affect the transit unicast routing of IP directed broadcasts.
If directed broadcast is enabled for an interface, incoming directed broadcast IP packets
intended for the subnet assigned to interface will be flooded as broadcasts on that subnet.
If the no ip directed-broadcast command is configured for an interface, directed broadcasts
destined for the subnet where the interface is attached will be dropped instead of broadcast.
Interface mode
Mode
To enable ip directed-broadcast, to flood broadcast packets out via the vlan2 interface, enter:
Examples
To disable ip directed-broadcast, disabling the flooding of broadcast packets via vlan2,
enter:
show running-config
Validation
Commands
ip forward-protocol udp
Related Commands
ip helper-address
23.12
New vs_531 %flag
awplus# configure terminal
awplus(config)# interface vlan2
awplus(config-if)# ip directed-broadcast
awplus# configure terminal
awplus(config)# interface vlan2
awplus(config-if)# no ip directed-broadcast
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
IP Addressing and Protocol Commands Use this command to enable flooding of directed broadcast packets into a directly connected subnet.
C613-50007-01 REV B