ccna yeni müfredat

ccna yeni müfredat.Be sure to familiarize yourself with the output of the commands showspanning-tree vlan and show spanning-tree interface. You can also use the command show spanning-tree interface to view the STP status of a specific port, as follows.Switch# showspanning-tree interface fastethernet1/0/5 Vian Role Sts Cost Prio.Nbr TypeVLAN0001 Root FWD 19 128.1 P2PVLAN0002 Al tn DIS 19 128.2 P2PVLAN0003 Root FWD 19 128.2 P2PTo troubleshoot PVRST+, use the command debug spanning-tree pvst+; to troubleshoot STP port state change, use the command debugspanning-tree switch stateo13.3.5 Optimizing PVST+ and RSTPTo understand the benefits of PVST+ and RSTP, see Figure 13.13, where there are two VLANs, numbered 1 and 2. The default behavior of Cisco switches is that all VLANs use the same switch (the switch with the smallest switch ID, in this case switch A) as the root switch. Note that according to the RSTP calculations, Switch C disables its ports connected to Switch B for both VLANs. The disadvantage of this design is that this access switch has two connections to the distribution layer, but only one of them is used.Figure 13.14 shows a better design, but to create this topology, the network must be manually adjusted to ensure that Switch A is the root switch for the VLAN and Switch B is the root switch for VLAN 2. When using this design, two uplink connections from the access layer switch to the distribution layer switch can be utilized: in Figure 13.14, VLAN1 will use the left uplink connection and VLAN2 will use the right uplink connection.In the design shown in Figure 13.14, you must ensure that the default gateway for VLAN1 is Switch A (assuming it is a Layer 3 switch), and the default gateway for VLAN2 is Switch B (assuming it is a Layer 3 switch). If this is not configured and the default gateway is set to Switch A, traffic for VLAN2 to leave this subnet must go to Switch B via the access layer switch,