三层交换机实现vlan互通
走的是192.168.30.0/24 那个下一跳192.168.30.254vlan30的ip（及pc3的网关），其他同理。
SW2：
Sys
Sysname SW2
Vlan 10
Vlan 20
Vlan 30
Vlan 40
Vlan 10
Port g1/0/1
Vlan 20
Port g1/0/2
Int g1/0/1
Di th
Int g1/0/3
Port link-type trunk
Port trunk permit vlan 10 20 30 40
Int g1/0/4
Port link-type trunk
Port trunk permit vlan 10 20 30 40
Sw3
Sys
Sysname SW3
Vlan 10
Vlan 20
Vlan 30
Vlan 40
Vlan 30
Port g1/0/1
Vlan 40
Port g1/0/2
Int g1/0/3
Port link-type trunk
Port trunk permit vlan 10 20 30 40
Int g1/0/4
Port link-type trunk
Port trunk permit vlan 10 20 30 40
SW1
Sys
Sysname SW1
Vlan 10
Vlan 20
Vlan 30
Vlan 40
Int g1/0/1
Port link-type trunk
Port trunk permit vlan 10 20 30 40
Int g1/0/2
Port link-type trunk
Port trunk permit vlan 10 20 30 40
Qu
Stp priority 0
Int vlan 10
Ip add 192.168.10.254 24
Int vlan 20
Ip add 192.168.20.254 24
Int vlan 30
Ip add 192,168.30.254 24
Int vlan 40
Ip add 192.168.40.254 24