Calculate the new spanning tree after BR1 is down The first thing you have to do is designate the new root.. We define p=200 as root because “At the base of the tree is a root bridge – The switch with the lowest bridge ID (a concatenation of a 16-bit user-assigned priority and the switch’s MAC address) is elected as the root-bridge.. Pay particular attention to the role of the root bridge in spanning tree, as well as the role that Bridge Protocol Data Units (BPDUs).
†STP Manipulation Attack EXAM ALERT Stop! If you are unfamiliar with spanning tree protocol (STP) operation, now is the time for you to review the subject from the CCNA prerequisite material.
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