Step 2

Elect one Root Port per non-Root Bridge Step 3.

Elect one Designated Port per segment

First, the bridged network elects a single Root Bridge. Second, every non-Root Bridge elects a single Root Port, the port that is the closest to the Root Bridge. Third, the bridges elect a single Designated Port for every segment.

For example, in a network that contains 15 switches and 146 segments (remember every switch port is a unique segment), the number of STP components that exist corresponds to the values documented in Table 6-2.

Table 6-2. STP Components in a 15 Switch and 146 Segment Network

STP Component


Root Bridge


Root Port


Designated Ports


Also, all STP decisions are based on a predetermined sequence as follows: Step 1.

Lowest Root BID

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