先把每个主机上配置ip地址和掩码地址，然后在交换机上创建vlan 10和vlan 20，之后用interface gi进入接口
把主机1和2配置为vlan10，主机3和4配置为vlan20。之后在交换机r2上创建vlan 10和vlan 20，之后用interface gi进入接口
把主机1配置为vlan10，主机2配置为vlan20。之后再把两个交换机都用trunk模式。
第一个交换机：
sys
sysname r1vlan 10 vlan 20interface gi 1/0/1port link-type accessport access vlan 10interface gi 1/0/2port link-type accessport access vlan 10interface gi 1/0/3port link-type accessport access vlan 20interface gi 1/0/4port link-type accessport access vlan 20quit
interface gi 1/0/48port link-type trunkport trunk permit vlan 10 20第二个交换机：
sys
sysname r2vlan 10vlan 20interface gi 1/0/1port link-type accessport access vlan 10interface gi 1/0/2port link-type accessport access vlan 20quinterface gi 1/0/48
port link-type trunk