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CCNA Data Center DCICN 640-911 Official Cert Guide by Chad Hintz, Wendell Odom

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Connecting STP Concepts to STP Configuration Options

If you think back to the details of STP operation in Chapter 11, STP uses two types of numbers for most of its decisions: the bridge ID (BID) and STP port costs. Focusing on those two types of numbers, consider this summary of what STP does behind the scenes:

Image Use the BID to elect the root switch, electing the switch with the numerically lowest BID.

Image Use the total STP cost in each path to the root, when each nonroot switch chooses its own root port (RP).

Use each switch’s root cost, which is in ...

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