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show voice port - Tecnológico de Costa Rica

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Un<strong>de</strong>rstanding Loops<br />

Using the Spanning-Tree Protocol 8 - 3<br />

If there is more than one path from one LAN to another, the infrastructure<br />

contains a loop.<br />

Figure 8.1 - Example Loop on a Bridge Infrastructure<br />

No<strong>de</strong> A<br />

LAN 1<br />

Bridge 1 Bridge 2<br />

LAN 2<br />

If No<strong>de</strong> A transmits a multicast packet, both Bridge 1 and Bridge 2 will<br />

try and forward the packet to LAN 2. Each bridge, on seeing the other’s<br />

transmission on LAN 2, will forward the packet back to LAN 1. The<br />

cycle will continue and the packet will loop forever taking up all of the<br />

bandwidth of the bridges.<br />

Topologies containing loops may be more complicated. For example, if<br />

Bridge 2 was replaced by two bridges with a LAN between them, the<br />

effect would still be the same.

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