Compatible-systems 5.4 Manual do Utilizador descarregar pdf (Página 295)

Appendices 289

In all other respects, spanning tree bridges operate in the same fashion as

simple learning bridges.

A Simple Bridging Example

Bridging Example

In the diagram above, the bridge develops a table by listening to both the Port

0 net and the Port 1 net. Through the listening process, it associates Worksta-

tion A with Port 0 and Workstations B and C with Port 1. A simplified

bridging table is shown below:

A -> Port 0

B -> Port 1

C -> Port 1

When a packet with A as a destination address arrives at Port 0, the packet is

dropped (A is on the same interface). When a packet with a destination

address of C arrives at Port 0, the packet is forwarded to Port 1. When a packet

with a destination address which isn’t in the table (or a broadcast address)

arrives at Port 1, it is forwarded to Port 0.

Multiport Bridges/Switches and “Bridge Groups”

When a router has multiple interfaces, and also supports bridging/switching,

some new concepts are required to understand the organization of the avail-

able functions.

Backbone

ocal Net

ridge

Workstatio n C

Workstatio n A

Port 0 Net

Port 1 Net

Workstatio n B

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Compatible-systems 5.4 Manual do Utilizador Página 295