PLANET FGSW-2840 - Manual (Page 118)

User’s Manual of FGSW-2840 / FGSW-4840S
The Managed 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. The two (optional) Gigabit ports (default port cost = 20,000) on switch A are connected to
one (optional) Gigabit port on both switch B and C. The redundant link between switch B and C is deliberately chosen as a 100
Mbps Fast Ethernet link (default port cost = 200,000). 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.
The screen in Figure 4-5-4 appears.
Figure 4-5-4: Spanning Tree Page Screenshot
This section has the following items:
■ STP Config Configure global configuration of spanning tree function.
■ Port Config Configure the parameters of the CIST ports for spanning tree function.
■ MSTP Instance Configure the parameters of the MSTP Instance for spanning tree function.
■ STP Security Configuring protection function for devices can prevent devices from any
malicious attack against STP features.
118