Bridging and Routing Models 3-7
Figure 3-7 illustrates CoreBuilder 2500 routing:
1 The packet enters the CoreBuilder system.
2 The bridging layer examines the packet’s destination address. The
destination address corresponds to the address of one of the system ports
configured for routing (as opposed to a learned end station address).
3 The packet is passed to the router interface that is associated with the
port where the packet was received.
4 The routing layer:
a Selects a destination interface based on the destination network
address
b Determines the MAC address of the next hop (either the destination
host or another gateway)
c Passes the packet back to the bridging layer
5 The bridging layer then selects a segment (port) based on the destination
MAC address and forwards the packet to that segment.
Figure 3-7 CoreBuilder 2500 Routing
1
ransmitting host
3
Destination host
5
2
1
2
3
Router interfaces
Bridging layer
Routing layer
Subnetworks
4
1 2 3
Router
Bridge
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