#MSTP多实例生成树实验。
拓扑如下：
mstp多实例的配置：
1.配置domain1，domain2，domain3等三个域，在每个域内配置两个非0实例；
2.指定非0的实例中的S1,S2,S5,S6,S11,S12设备为实例的根，指对端为备份根;
3.配置S5为MSIT域的总根；并更改sw10的G0/0/3开销，使其变成AP端口。
抓包结果如下，stp的详细信息如下；
当区域边界设备S10发生拓扑变化会发送TC置位的BPDU泛洪置全网：
设备配置如下：
《S1》：
vlan batch 10 20
stp instance 10 root primary
stp instance 20 root secondary
stp region-configuration
region-name domain1
instance 10 vlan 10
instance 20 vlan 20
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S2》
vlan batch 10 20
stp instance 20 root primary
stp instance 10 root secondary
stp region-configuration
region-name domain1
instance 10 vlan 10
instance 20 vlan 20
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S3》
vlan batch 10 20
stp region-configuration
region-name domain1
instance 10 vlan 10
instance 20 vlan 20
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
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
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S4》
vlan batch 50 60
stp region-configuration
region-name domain3
instance 5 vlan 50
instance 6 vlan 60
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
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
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S5》
vlan batch 50 60
stp instance 0 priority 4096
stp instance 5 root primary
stp instance 6 root secondary
stp region-configuration
region-name domain3
instance 5 vlan 50
instance 6 vlan 60
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S6》
vlan batch 50 60
stp instance 5 root secondary
stp instance 6 root primary
stp region-configuration
region-name domain3
instance 5 vlan 50
instance 6 vlan 60
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S10》
vlan batch 110 120
stp region-configuration
region-name domain2
instance 11 vlan 110
instance 12 vlan 120
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
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
stp instance 0 cost 100000
interface GigabitEthernet0/0/4
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S11》
vlan batch 110 120
stp instance 11 root primary
stp instance 12 root secondary
stp region-configuration
region-name domain2
instance 11 vlan 110
instance 12 vlan 120
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
《S12》
vlan batch 110 120
stp instance 12 root primary
stp instance 11 root secondary
stp region-configuration
region-name domain2
instance 11 vlan 110
instance 12 vlan 120
active region-configuration
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
链路聚合实验；拓扑如下：
1.配合优先级使S1成为E-trunk的主设备
2.配置S3的优先级为Eth-trunk的主动端，开启抢占十秒，最大的活跃链路为3条，最小的活跃链路为2条，模式都为LACP静态；
E-Trnnk邻居交互报文使用UDP协议1025端口；
Eth-Trunk运行lacp静态模式的报文交互数据包；
配置如下：《S1》
vlan batch 10
interface Vlanif10
ip address 10.1.12.1 255.255.255.0
e-trunk 1
priority 10
peer-address 10.1.12.2 source-address 10.1.12.1
interface Eth-Trunk10
mode lacp-static
e-trunk 1 remote-eth-trunk 20
interface GigabitEthernet0/0/1
eth-trunk 10
interface GigabitEthernet0/0/2
eth-trunk 10
interface GigabitEthernet0/0/3
port link-type access
port default vlan 10
interface GigabitEthernet0/0/4
eth-trunk 10
《S2》
vlan batch 10
interface Vlanif10
ip address 10.1.12.2 255.255.255.0
e-trunk 1
priority 10
peer-address 10.1.12.1 source-address 10.1.12.2
interface Eth-Trunk20
mode lacp-static
e-trunk 1 remote-eth-trunk 10
interface GigabitEthernet0/0/1
eth-trunk 20
interface GigabitEthernet0/0/2
eth-trunk 20
interface GigabitEthernet0/0/3
port link-type access
port default vlan 10
interface GigabitEthernet0/0/4
eth-trunk 10
《S3》
lacp priority 100
interface Eth-Trunk1
mode lacp-static
least active-linknumber 2
lacp preempt enable
max active-linknumber 3
lacp preempt delay 10
interface GigabitEthernet0/0/1
eth-trunk 1
interface GigabitEthernet0/0/2
eth-trunk 1
interface GigabitEthernet0/0/3
eth-trunk 1
interface GigabitEthernet0/0/4
eth-trunk 1
interface GigabitEthernet0/0/5
eth-trunk 1
interface GigabitEthernet0/0/6
eth-trunk 1