(Optional) Access list number ranging 1 to 199 and
1300 to 2699. After an access list number has been
defined, only the IP directed broadcast packets that
match this access list are converted.
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 the no ip directed-broadcast command is configured on an interface, RGOS
will discard the directed broadcast packets received from the directly connected
network.
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