Switches in a Spanning Tree domain have a Bridge ID (BID), which is used to uniquely identify the switch within the STP domain. The BID is also used to assist in the election of an STP Root Bridge, which will be described later in this chapter. The BID is an 8-byte field that is composed from a 6-byte MAC address and a 2-byte Bridge Priority. The BID is illustrated in Figure 3-11 below:
Fig. 3-11. Bridge ID Format
The Bridge Priority is the priority of the switch in relation . . .
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