Find the Root Bridge <br /> <br />1. Find the root bridge with the lowest priority or MAC address. Sometimes called the Bridge ID. <br />2. All the active ports on the Root Bridge become designated ports. <br /> <br /> <br />Find the Root ports (One RP per switch) <br /> <br />1. Lowest cost to Root Bridge. <br />2. Lowest neighbor Bridge ID <br />3. Lowest neighbor port priority <br />4. Lowest neighbor internal port number. <br /> <br /> <br /> <br />Finding the Designated ports for LAN segments. <br /> <br />1. Between non-root switch segments, find the switch that has the lost cost to the root bridge. <br />2. Lowest BID <br />3. Lowest neighbor port priority (Rare) <br />4. Lowest neighbor internal port number. (Rare) <br /> <br /> <br />STP Costs <br />1. 100 for 10Mbps <br />2. 19 for 100Mbps <br />3. 4 for 1Gbps <br />4. 2 for 10Gbps
