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( Note: Make sure trunking ports are in the same VLAN group. )
STP (Spanning Tree Protocol)
Spanning tree is a link management protocol that provides path
redundancy while preventing undesirable loops in the network. For Layer
2 Ethernet network to function properly, only one active path must exist
between two stations. The spanning-tree algorithm calculates the best
loop-free path throughout a switched network. STP forces redundant
data paths into a standby (blocked) state. If a network segment in the
spanning tree fails and a redundant path exists, the spanning-tree
algorithm recalculates the spanning tree topology and activates the
standby path.
If you want to participate in spanning tree, have the "Enable
Spanning Tree Protocol" checkbox selected.
The Current Spanning Tree Root describes the unique root switch
information for the instance of spanning tree.
Figure 5-8-1 The STP upper page
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