cisco ccna qualification

cisco ccna qualification.The BID of SW1 contained in the BPDU is lower than the local BIDO, and then SW3 will forward the BPDU with the root switch overhead value of 5 to SW2O.of the BPDU to SW2O Eventually, SW1 is established as the root switch in this topology.As described at the beginning of this section, the switches within the LAN will combine their efforts to generatea traffic forwarding tree. Once the root switch is established, you can begin to construct the tree. Before describing the "tree planting" processBefore describing the tree planting process, it is important to clarify the concepts of port roles (port functions) and port states.Port Roles: There is more than one way to name port roles, and they vary depending on the type of STP protocol the switch is running; however, there are three main port roles that are critical to understanding how STP works. Once you know what these 3 port roles mean, it is easy to sort out the nuances of the various STP protocols.. The root port (RP) is the port on the non-root switch that is closest to the root switch (has the lowest path overhead value, i.e., the root switch overhead value).. Designated Port (DP) is the switch port in a given segment that is closest to the root bridge. Let's say that if a switch has a certain30 Chapter 1 Network Protocols and Network Device Basicsport is connected to a host, that port will be a DP because it is the closest port to the root switch for that LAN segment. This switch is also called the Designated Switch for that LAN segment. All ports on the root switch are DPs.