(启用生成树rstp，将二层设为根交换机

评分：ruijie#sh spanning-tree)

二层&三层：int fa0/3

sw mode tr

exit

spanning-tree

spanning-tree mode rstp

exit

二层：spanning-tree priority 4096

exit

sh spanning-tree(root cost:18000 rootport)

三层：int fa0/3

spanning-tree cost 1800

exit

sh spanning-tree (root cost:180000 rootport)

4：创建四个vlan(评分：ruijie#sh vlan)

Ruijie(config)#vlan 11

Ruijie(config)#int f0/11

Ruijie(config-FastEthernet 0/11)#switchport mode access

Ruijie(config-FastEthernet 0/11)#switchport access vlan 11

Ruijie(config-FastEthernet 0/11)#exit

Ruijie(config)#sh vlan

5:vlan33的数据包不打标签，vlan44的数据包无法通过交换机的链路

int agg 1

sw trunk native vlan33

sw trunk allowed vlan remove 44