STP Components and Operation

Three important parameters—the bridge identifiers, port priorities, and path costs—influence how STP will shape the switched network by blocking on some ports and forwarding on others. STP guarantees only a loop-free environment; it does not guarantee an optimal configuration. Because of this, it's sometimes necessary to configure certain parameters on some of the bridges and/or switches in a data network. Table 4.1 contains some important terms used by STP.

Table 4.1. Important STP Terms
Bridge IdentifiersEach bridge has a unique identifier that it uses when it multicasts its BPDUs. The identifier is made up of a bridge (switch) priority and one of the switch's MAC addresses.
Path CostsEach port has ...

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