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IP A
P
DDRESSING AND
ROTOCOL
-
IP DIRECTED
BROADCAST
ip directed-broadcast
Overview
Use this command to enable flooding of directed broadcast packets into a directly
connected subnet. If this command is configured on an interface, then directed
broadcasts received on other interfaces, destined for the subnet on this interface,
will be flooded to the subnet broadcast address of this interface.
Use the no variant of this command to disable ip directed-broadcast. When this
feature is disabled using the no variant of this command, directed broadcasts are
not forwarded.
ip directed-broadcast
Syntax
no ip directed-broadcast
Default
The ip directed-broadcast command is disabled by default.
Mode
Interface Configuration for a VLAN interface or a local loopback interface.
Usage notes
IP directed-broadcast is enabled and disabled per interface. When enabled a
directed broadcast packet is forwarded to an enabled 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 device 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 the
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.
Examples
To enable the flooding of broadcast packets via vlan2, enter the following
commands:
awplus#
awplus(config)#
awplus(config-if)#
To disable the flooding of broadcast packets via vlan2, enter the following
commands:
awplus#
awplus(config)#
awplus(config-if)#
C613-50644-01 Rev B
C
OMMANDS
configure terminal
interface vlan2
configure terminal
interface vlan2
Command Reference for IE220 Series
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
ip directed-broadcast
no ip directed-broadcast
830
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