D-Link DES-3326 User Manual page 68

24-port NWay Ethernet Switch User's Guide
Figure 5-5. After Applying the STA Rules
The switch with the lowest Bridge ID (switch C) was elected the
root bridge, and the ports were selected to give a high port cost
between switches B and C.
(default port cost = 4) on switch A are connected to one (optional)
Gigabit port on both switch B and C.
between switch B and C is deliberately chosen as a 100 Mbps Fast
Ethernet link (default port cost = 19). Gigabit ports could be
used, but the port cost should be increased from the default to
ensure that the link between switch B and switch C is the blocked
link.
Note:
Note also that the example network topology is
intended to provide redundancy to protect the network
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The two (optional) Gigabit ports
The redundant link
Switch Management and Operating Concepts