
DES-7200 CLI Reference Guide
Chapter 21 IP Address Configuration Commands
21-15
Usage
guidelines
IP directed broadcast packet is an IP packet whose
destination address is an IP subnet broadcast address. For
example, the packet with the destination address
172.16.16.255 is called a directed broadcast packet.
However, the node that generates this packet is not a
member of the destination subnet.
The device that is not directly connected to the destination
subnet receives an IP directed broadcast packet and
handles this packet in the same way as forwarding a
unicast packet. After the directed broadcast packet
reaches a device that is directly connected to this subnet,
the device converts the directed broadcast packet into a
flooding broadcast packet (typically the broadcast packet
whose destination IP address is all ―1‖), and then sends
the packet to all the hosts in the destination subnet in the
manner of link layer broadcast.
You can enable conversion from directed broadcast into
physical broadcast on a specified interface, so that this
interface can forward a direct broadcast packet to a
directly connected network. This command affects only the
final transmission of directed broadcast packets that have
reached the destination subnet instead of normal
forwarding of other directed broadcast packets.
You can also define an access list on an interface to
control which directed broadcast packets to forward. After
an access list is defined, only the packets that conform to
the conditions defined in the access list undergo
conversion from directed broadcast into physical
broadcast.
If
no ip directed-broadcast
is configured on an interface,
DES-7200 will discard the directed broadcast packets
received from the directly connected network.
Examples
The following is an example of enabling forwarding of directed
broadcast packet on the fastEthernet 0/1 port of a device.
interface fastEthernet
0/1
ip directed-broadcast
Platform
description
This command is not supported on the Layer 2 switch.
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