要求如上图所示
第一步简单的规划一下ip网段
172.16.0.0/24
172.16.2.0/24
172.16.3.0/24
在这里不进行配置，等待交换全部就绪后再进项IP的配置
第二步：分析交换中所要用到的技术，找到其相关联得先后顺序

Trunk  vlan  Stp  Vrrp  Dhcp
创建eth-trunk口
[sw1]int Eth-Trunk 0

[sw1-Eth-Trunk0]int g0/0/4

[sw1-GigabitEthernet0/0/4]eth-trunk 0

[sw1-GigabitEthernet0/0/4]int g0/0/3

[sw1-GigabitEthernet0/0/3]e 0
创建vlan
[sw3]int e0/0/3

[sw3-Ethernet0/0/3]port link-type access

[sw3-Ethernet0/0/3]port default vlan 1

[sw3-Ethernet0/0/3]int e0/0/4

[sw3-Ethernet0/0/4]port link-type access

[sw3-Ethernet0/0/4]port default vlan 2
创建trunk
[sw1]interface Eth-Trunk 0

[sw1-Eth-Trunk0]port link-type trunk

[sw1-Eth-Trunk0]port trunk allow-pass vlan 2

[sw1-Eth-Trunk0]int g0/0/2

[sw1-GigabitEthernet0/0/2]port link-type trunk

[sw1-GigabitEthernet0/0/2]port trunk allow-pass v 2

[sw1-GigabitEthernet0/0/2]int g0/0/5

[sw1-GigabitEthernet0/0/5]port link-type trunk

[sw1-GigabitEthernet0/0/5]port trunk allow-pass v 2
[sw4]int e0/0/1

[sw4-Ethernet0/0/1]port link-type trunk

[sw4-Ethernet0/0/1]port trunk allow-pass v 2

[sw4-Ethernet0/0/1]int e0/0/2

[sw4-Ethernet0/0/2]port link-type trunk

[sw4-Ethernet0/0/2]port trunk allow-pass vlan 2
配置生成树协议
Sw1：

[sw1]stp enable

[sw1]stp region-configuration

[sw1-mst-region]region-name a

[sw1-mst-region]instance 1 vlan 1

[sw1-mst-region]instance 2 vlan 2

[sw1-mst-region]active region-configuration

[sw1]stp instance 1 root primary //主根

[sw1]stp instance 2 root secondary //备份

Sw2：

[sw2]stp enable

[sw2]stp region-configuration

[sw2-mst-region]region-name a

[sw2-mst-region]instance 1 vlan 1

[sw2-mst-region]instance 2 vlan 2

[sw2-mst-region]active region-configuration

[sw2]stp instance 2 root primary //主根

[sw2]stp instance 1 root secondary //备份

Sw3：

[sw3]stp enable

[sw3]stp region-configuration

[sw3-mst-region]region-name a

[sw3-mst-region]instance 1 vlan 1

[sw3-mst-region]instance 2 vlan 2

[sw3-mst-region]active region-configuration
Sw4：

[sw4]stp enable

[sw4]stp region-configuration

[sw4-mst-region]region-name a

[sw4-mst-region]instance 1 vlan 1

[sw4-mst-region]instance 2 vlan 2

[sw4-mst-region]active region-configuration
配置svi
Sw1:

[sw1]int Vlan 1

[sw1-Vlanif1]ip address 172.16.10.1 24

[sw1]int Vlanif 2

[sw1-Vlanif2]ip address 172.16.20.1 24

Sw2:

[sw2]int Vlanif 1

[sw2-Vlanif1]ip address 172.16.10.2 24

[sw2]int Vlanif 2

[sw2-Vlanif2]ip address 172.16.20.2 24
配置vrrp
Sw1：

[sw1]interface Vlanif 1

[sw1-Vlanif1]vrrp vrid 1 virtual-ip 172.16.10.254

[sw1-Vlanif1]vrrp vrid 1 priority 101

[sw1-Vlanif1]vrrp vrid 1 track interface GigabitEthernet 0/0/5

[sw1]int Vlanif 2

[sw1-Vlanif2]vrrp vrid 2 virtual-ip 172.16.20.254

[sw1-Vlanif2]vrrp vrid 2 track interface GigabitEthernet 0/0/5
Sw2：

[sw2]interface Vlanif 1

[sw2-Vlanif1]vrrp vrid 1 virtual-ip 172.16.10.254

[sw2-Vlanif1]vrrp vrid 1 track interface GigabitEthernet 0/0/5

[sw2]interface Vlanif 2

[sw2-Vlanif2]vrrp vrid 2 virtual-ip 172.16.20.254

[sw2-Vlanif2]vrrp vrid 2 priority 101

[sw2-Vlanif2]vrrp vrid 2 track interface GigabitEthernet 0/0/5
配置DHCP
Sw1:

[sw1]dhcp enable

[sw1]ip pool v1

[sw1-ip-pool-v1]network 172.16.10.0 mask 24

[sw1-ip-pool-v1]gateway-list 172.16.10.254

[sw1-ip-pool-v1]dns-list 114.114.114.144

[sw1]ip pool v2

[sw1-ip-pool-v2]network 172.16.20.0 mask 24

[sw1-ip-pool-v2]gateway-list 172.16.20.254

[sw1-ip-pool-v2]dns-list 114.114.114.114

在接口上启用DHCP功能：

[sw1]int Vlanif 1

[sw1-Vlanif1]dhcp select global

[sw1]int Vlanif 2

[sw1-Vlanif1]dhcp select global
Sw2:

[sw2]dhcp enable

[sw2]ip pool v1

[sw2-ip-pool-v1]network 172.16.10.0 mask 24

[sw2-ip-pool-v1]gateway-list 172.16.10.254

[sw2-ip-pool-v1]dns-list 114.114.114.144

[sw2]ip pool v2

[sw2-ip-pool-v2]network 172.16.20.0 mask 24

[sw2-ip-pool-v2]gateway-list 172.16.20.254

[sw2-ip-pool-v2]dns-list 114.114.114.114

在接口上启用DHCP功能：

[sw2]int Vlanif 1

[sw2-Vlanif1]dhcp select global

[sw2]int Vlanif 2

[sw2-Vlanif1]dhcp select global
核心层配置
Sw1:

[sw1]vlan 99

[sw1]int Vlanif 99

[sw1-Vlanif99]ip address 12.1.1.1 24

[sw1]int g0/0/5

[sw1-GigabitEthernet0/0/5]port link-type access

[sw1-GigabitEthernet0/0/5]port default vlan 99

[sw1]ip route-static 0.0.0.0 0 12.1.1.2
Sw2:

[sw2]vlan 99

[sw2]int Vlanif 99

[sw2-Vlanif99]ip address 12.1.2.1 24

[sw2]int g0/0/5

[sw2-GigabitEthernet0/0/5]port link-type access

[sw2-GigabitEthernet0/0/5]port default vlan 99

[sw2]ip route-static 0.0.0.0 0 12.1.2.2
R1:

[r1]interface GigabitEthernet 0/0/0

[r1-GigabitEthernet0/0/0]ip address 12.1.1.2 24

[r1-GigabitEthernet0/0/0]int g0/0/1

[r1-GigabitEthernet0/0/1]ip address 12.1.2.2 24

[r1]ip route-static 172.16.10.0 24 12.1.1.1

[r1]ip route-static 172.16.20.0 24 12.1.1.1

[r1]ip route-static 172.16.10.0 24 12.1.2.1

[r1]ip route-static 172.16.20.0 24 12.1.2.1