hr和dl划分在两个不同的VLAN里,然后三台交换机都要配置这两个VLAN,并在互联的接口上起trunk
比如hr在VLAN100,dl在VLAN200,则左边交换机的配置可以是:
interface G0/1
description HR
switchport mode access
switchport access vlan 100
!
interface G0/2
description DL
switchport mode access
switchport access vlan 200
!
interface G0/3
description To another Switch
switchport mode trunk
switchport trunk allowed vlan 100,200