Subnet Broadcast

Subnet broadcast (defined in RFC 922) supports the sending of packets to all the subnets of a particular network number. Packet duplication occurs when there are alternative paths in a network. In Figure 7-10, when Workstation A uses subnet broadcasting to send a packet to each workstation on Subnetwork 2, a duplicate packet also arrives.

Figure 7-10 Subnet Broadcast

32 bits-



Total length



Fragment offset



Header checksum

Source address

Destination address

Options (+ padding)

Data (variable)

Whenever there is a duplicate path in the network, a duplicate packet is delivered. Because many multicast applications are data intense, packet duplication is a significant disadvantage of subnet broadcast.

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