Aironet AP4500 Guia do Utilizador descarregar pdf (Página 104)

Using the Spanning Tree Protocol 8 - 3

Understanding Loops

If there is more than one path from one LAN to another, the infrastruc-

ture contains a loop.

If Node A transmits a multicast packet, both Bridge 1 and Bridge 2 will

try and forward the packet to LAN 2. Each Bridge, on seeing the otherÕs

transmission on LAN 2, will forward the packet back to LAN 1. The

cycle will continue and the packet will loop forever taking up all of the

bandwidth of the Bridges.

Topologies containing loops may be more complicated. For example, if

Bridge 2 was replaced by two Bridges with a LAN between them, the

effect would still be the same.

Figure 8.1 - Example Loop on a Bridge Infrastructure

Node A

LAN 1

LAN 2

Bridge 1 Bridge 2

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 222 223

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Aironet AP4500 Guia do Utilizador Página 104