一、网络拓扑
二、各个设备的配置
PC1：
PC配置：
PC3配置：
PC4配置：
LSW1与LSW2、LSW3、LSW4配置一样如下：
#
sysname LSW1
#
undo info-center enable
#
vlan batch 10 20 30 40
#
stp region-configuration
instance 1 vlan 10 20
instance 2 vlan 30 40
active region-configuration
#
interface Ethernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface Ethernet0/0/2
port link-type access
port default vlan 10
#
interface Ethernet0/0/3
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
LSW5与LSW6配置一样如下：
#
sysname LSW 5
#
undo info-center enable
#
vlan batch 10 20 30 40
#
stp mode stp
stp instance 1 root primary
stp instance 2 root secondary
#
stp region-configuration
region-name huawei
revision-level 5
instance 1 vlan 10 20
instance 2 vlan 30 40
active region-configuration
#
interface Vlanif10
ip address 192.168.10.254 255.255.255.0
#
interface Vlanif20
ip address 192.168.20.254 255.255.255.0
#
interface Vlanif30
ip address 192.168.30.254 255.255.255.0
#
interface Vlanif40
ip address 192.168.40.254 255.255.255.0
#
interface Eth-Trunk1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/1
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/3
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/4
eth-trunk 1
#
interface GigabitEthernet0/0/5
eth-trunk 1
#
interface GigabitEthernet0/0/6
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/7
port link-type trunk
port trunk allow-pass vlan 2 to 4094
#
三、ping通测试
四、抓包
无stp时的抓包会发现在短时间内有大量的ARP报文
有stp时的抓包：
