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3-6 CHAPTER 3: ROUTING AND THE LANPLEX SYSTEM
LANplex
Bridging/Routing
Model
The LANplex 6000 determines whether a packet should be bridged or
routed using the destination MAC address. Before a host sends a packet
to another host, it compares its own network address to the network
address of the other host as follows:
■ If network addresses are on the same subnet, the packet is bridged
directly to the destination host’s address.
■ If network addresses are on different subnets, the packet must be
routed from one subnet to the other. In this case, the host transmits the
packet to the connecting router’s MAC address.
In the LANplex bridging/routing model, a packet is bridged as follows
(see Figure 3-6):
1 The packet enters the module.
2 The packet’s destination MAC address is examined by the bridging layer.
3 The destination MAC address does not correspond to the MAC address
of one of the module ports configured for routing. The bridging layer
selects a segment (port) based on the destination MAC address and
forwards the packet to that segment.
Figure 3-6 Bridging and the LANplex Bridging/Routing Model
1
Transmitting Host
3
Destination Host
2
1
2
3
Router Interfaces
Bridging Layer
Routing Layer
Subnets
123
Router
Bridge