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cisco ccna price.1 GbiVs 2000010 GbiVs 2000100 GbiVs 2001 TbiVs 2010TbiVs 2To start the Spanning Tree Algorithm (STA), you first need to establish the STP root switch. The switch with the lower BID value will become the root switch. The first thing to compare is the switch's BID priority field value, and if two (or more) switches have the same BID priority field value, the switch with the lower MAC address field value will be established as the root switch.The process of establishing the switch with the lowest BID value is called root switch election. When the root switch election is first performed, each switch will attempt to establish itself as the root switch and will also issue Hello BPDUs to announce its presence to the remaining switches in the LAN. Each switch will set the local BID as the root BID in the initial HelloBPDU.As soon as a HelloBPDU containing a better root BID (with a lower BID value) is received, the switch stops sending the self-generated Hello BPDU and starts forwarding the received (possibly root-switch-generated) Hello BPDUO Before forwarding such a HelloBPDU, it also updates the root switch overhead value in it (adding the value of the local port receiving the HelloBPDU to the original value). HelloBPDUs to the port overhead value of the local port) oThe root switch election process will continue until the root switch election is complete and the root switch is established. At this point, all switches within the LAN not only know which switch is the root switch, but also calculate the overhead value for the local machine to forward frames to the root switch (the root overhead value). Figure 1.26 shows the root switch election process in the example topology.Network segment 1