Cisco WS-C3550-12G Software Configuration Manual page 295

Chapter 10 Configuring STP
Figure 10-9 GigaStack GBIC Connections and STP Convergence
Catalyst 3550-12T
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GigaStack GBIC connection for fast convergence
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GigaStack GBIC connection for normal convergence
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Catalyst 3550 Multilayer Switch Software Configuration Guide
Understanding Advanced STP Features
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