实验案例：通过MSTP实现负载均衡

实验环境
xxx 公司内部网络由四个VLAN构成，分别是VLAN10、VLAN20、VLAN30及服务器区域的VLAN40，公司的核心技术是两台华为的5700设备。因为VLAN30的流量比较大，所以公司要求VLAN10、VLAN20和VLAN40的流量通过S3-S1-R1访问公司其他网络及外网，VLAN30的流量通过S3-S2-R1访问公司其他网络及外网。

配置客户端和路由器的IP地址



配置VLAN及Trunk
[S1]vlan batch 10 20 30 40
[S1]interface g0/0/2
[S1-GigabitEthernet0/0/2]port link-type trunk
[S1-GigabitEthernet0/0/2]port trunk allow-pass vlan all
[S1]interface g0/0/1
[S1-GigabitEthernet0/0/1]port link-type trunk
[S1-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[S1]interface g0/0/3
[S1-GigabitEthernet0/0/3]port link-type hybrid
[S1-GigabitEthernet0/0/3]port hybrid untagged vlan 10 20 40
[S1-GigabitEthernet0/0/3]port hybrid pvid vlan 10
[S2]vlan batch 10 20 30 40
[S2]interface g0/0/2
[S2-GigabitEthernet0/0/2]port link-type trunk
[S2-GigabitEthernet0/0/2]port trunk allow-pass vlan all
[S2]interface g0/0/1
[S2-GigabitEthernet0/0/1]port link-type trunk
[S2-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[S2]interface g0/0/3
[S2-GigabitEthernet0/0/3]port link-type hybrid
[S2-GigabitEthernet0/0/3]port hybrid untagged vlan 30
[S2-GigabitEthernet0/0/3]port hybrid pvid vlan 30
[S3]vlan batch 10 20 30 40
[S3]interface e0/0/3
[S3-Ethernet0/0/3]port link-type hybrid
[S3-Ethernet0/0/3]port hybrid untagged vlan 10 20 40
[S3-Ethernet0/0/3]port hybrid pvid vlan 10
[S3-Ethernet0/0/4]port link-type hybrid
[S3-Ethernet0/0/4]port hybrid untagged vlan 30
[S3-Ethernet0/0/4]port hybrid pvid vlan 30
[S3]interface e0/0/1
[S3-Ethernet0/0/1]port link-type trunk
[S3-Ethernet0/0/1]port trunk allow-pass vlan all
[S3]interface e0/0/2
[S3-Ethernet0/0/2]port link-type trunk
[S3-Ethernet0/0/2]port trunk allow-pass vlan all
配置MSTP
[S1]stp mode mstp
[S1]stp region-configuration
[S1-mst-region]region-name HUAWEI
[S1-mst-region]revision-level 1
[S1-mst-region]instance 1 vlan 10 20 40
[S1-mst-region]instance 2 vlan 30
[S1-mst-region]active region-configuration
[S1]stp instance 1 root primary
[S1]stp instance 2 root secondary
[S2]stp mode mstp
[S2]stp region-configuration
[S2-mst-region]region-name HUAWEI
[S2-mst-region]revision-level 1
[S2-mst-region]instance 1 vlan 10 20 40
[S2-mst-region]instance 2 vlan 30
[S2-mst-region]active region-configuration
[S2]stp instance 1 root secondary
[S2]stp instance 2 root primary
[S3]stp mode mstp
[S3]stp region-configuration
[S3-mst-region]region-name HUAWEI
[S3-mst-region]revision-level 1
[S3-mst-region]instance 1 vlan 10 20 40
[S3-mst-region]instance 2 vlan 30
[S3-mst-region]active region-configuration
验证
[S3]display stp brief
MSTID Port Role STP State Protection
0 Ethernet0/0/1 ROOT FORWARDING NONE
0 Ethernet0/0/2 ALTE DISCARDING NONE
0 Ethernet0/0/3 DESI FORWARDING NONE
0 Ethernet0/0/4 DESI FORWARDING NONE
1 Ethernet0/0/1 ROOT FORWARDING NONE
1 Ethernet0/0/2 ALTE DISCARDING NONE
1 Ethernet0/0/3 DESI FORWARDING NONE
2 Ethernet0/0/1 ALTE DISCARDING NONE
2 Ethernet0/0/2 ROOT FORWARDING NONE
2 Ethernet0/0/4 DESI FORWARDING NONE
[S3]
Sep 2 2019 18:06:02-08:00 S3 %%01PHY/1/PHY(l)[0]: Ethernet0/0/1: change stat
us to down
Sep 2 2019 18:07:02-08:00 S3 %%01PHY/1/PHY(l)[1]: Ethernet0/0/1: change stat
us to up
Sep 2 2019 18:07:11-08:00 S3 %%01PHY/1/PHY(l)[2]: Ethernet0/0/2: change stat
us to down
Sep 2 2019 18:08:00-08:00 S3 %%01PHY/1/PHY(l)[3]: Ethernet0/0/2: change stat
us to up