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1 - 6 ONline Ethernet Bridge Module Installation and Operation Guide
bridge. The Bridge looks at the source address of each packet generated on
the subnetwork and creates a database containing these addresses.
Note: If a node does not generate any packets, its location
cannot be dynamically learned by the Bridge Module.
When a packet is received by the Bridge Module, its destination address is
compared with the addresses in the source subnetwork database. Table 1-1
describes what happens when a packet is received by the Bridge Module.
High-Performance Design
While address filtering can reduce traffic loads on your network, it is
important to overall network integrity for a learning bridge to run as fast as
the network. The Bridge Module ensures high performance in the following
ways:
1. It uses high-speed multi-port memory so the IEEE 802.3 controllers
and the CPU all have separate access to the common packet memory.
Once a packet is received into this memory, it does not have to be
copied to be forwarded.
Table 1-1. Packet Distribution by Bridge Module
The Destination Address is.. The Packet is...
Found in the source
subnetwork database
Considered to be local to that
subnetwork (its source and destination
are on the same subnetwork). The
Bridge Module does not forward the
packet.
Not found in the source
subnetwork database
Considered to be on a different
subnetwork and forwarded onto the
other subnetwork (or the destination
node has not generated any traffic).