... and bridges must recompute the Spanning-Tree Protocol, which disrupts user traffic © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-12 Rapid Spanning-Tree Protocol © 2002, Cisco Systems, ... v2.0—3-3 Spanning-Tree Protocol • Provides a loop-free redundant network topology by placing certain ports in the blocking state © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-4 Spanning-Tree ... unused © 2002, Cisco Systems, Inc All rights reserved ICND v2.0—3-5 Spanning-Tree Protocol Root Bridge Selection • Bpdu = Bridge Protocol Data Unit (default = sent every two seconds) • Root bridge...