一、实验内容
1、内网IP地址172.16.0.0/16
2、sw1/2之间互为备份
3、VRRP/STP/VLAN/Trunk均使用
4、所有PC通过DHCP获取IP地址
二、拓扑设计
IP地址规划
172.16.0.0/16 总网
172.16.0.0/24点到点骨干链路
172.16.0.0/30——172.16.0.252/30
172.16.1.0/24MA骨干链路
172.16.1.0/29——192.16.1.248/29
172.16.2.0/24——172.16.255.0/24PC网段
三、实施
1、汇聚层
（1）创建VLAN
（2）配置Eth-trunk
[sw3]int Eth-Trunk 0
[sw3-Eth-Trunk0]q
[sw3]int GigabitEthernet 0/0/3
[sw3-GigabitEthernet0/0/3]eth-trunk 0
[sw3-GigabitEthernet0/0/3]int g0/0/4
[sw3-GigabitEthernet0/0/4]eth-trunk 0
[sw4]int Eth-Trunk 0
[sw4-Eth-Trunk0]q
[sw4]int g0/0/3
[sw4-GigabitEthernet0/0/3]eth-trunk 0
[sw4-GigabitEthernet0/0/3]int g 0/0/4
[sw4-GigabitEthernet0/0/4]eth-trunk 0
（3）配置trunk干道
[sw3]int Eth-Trunk 0
[sw3-Eth-Trunk0]port link-type trunk
[sw3-Eth-Trunk0]port trunk allow-pass vlan 1 to 2
[sw3]port-group group-member GigabitEthernet 0/0/2 GigabitEthernet 0/0/5
[sw3-port-group]port link-type trunk
[sw3-GigabitEthernet0/0/2]port link-type trunk
[sw3-GigabitEthernet0/0/5]port link-type trunk
[sw3-port-group]port trunk allow-pass vlan 1 to 2
[sw3-GigabitEthernet0/0/2]port trunk allow-pass vlan 1 to 2
[sw3-GigabitEthernet0/0/5]port trunk allow-pass vlan 1 to 2
[sw4]int Eth-Trunk 0
[sw4-Eth-Trunk0]port link-type trunk
[sw4-Eth-Trunk0]port trunk allow-pass vlan 1 to 2
[sw4]int g 0/0/2
[sw4-GigabitEthernet0/0/2]port link-type trunk
[sw4-GigabitEthernet0/0/2]port trunk allow-pass vlan 1 to 2
[sw4-GigabitEthernet0/0/2]int g 0/0/5
[sw4-GigabitEthernet0/0/5]port link-type trunk
[sw4-GigabitEthernet0/0/5]port trunk allow-pass vlan 1 to 2
[sw1]port-group group-member GigabitEthernet 0/0/1 to GigabitEthernet 0/0/2
[sw1-port-group]port link-type trunk
[sw1-GigabitEthernet0/0/1]port link-type trunk
[sw1-GigabitEthernet0/0/2]port link-type trunk
[sw1-port-group]port trunk allow-pass vlan 1 to 2
[sw1-GigabitEthernet0/0/1]port trunk allow-pass vlan 1 to 2
[sw1-GigabitEthernet0/0/2]port trunk allow-pass vlan 1 to 2
[sw2]interface GigabitEthernet0/0/1
[sw2-GigabitEthernet0/0/1] port link-type trunk
[sw2-GigabitEthernet0/0/1] port trunk allow-pass vlan 2
[sw2-GigabitEthernet0/0/1]interface GigabitEthernet0/0/2
[sw2-GigabitEthernet0/0/2] port link-type trunk
[sw2-GigabitEthernet0/0/2] port trunk allow-pass vlan 2
（4）配置STP（生成树）
[sw3]stp mode mstp
[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
[sw3-mst-region]q
[sw3]stp instance 1 root primary
[sw3]stp instance 2 root secondary
[sw4]stp mode mstp
[sw4]stp enable
[sw4]stp region-configuration
[sw4-mst-region]region-name b
[sw4-mst-region]instance 1 vlan 1
[sw4-mst-region]instance 2 vlan 2
[sw4-mst-region]active region-configuration
[sw4-mst-region]q
[sw4]stp instance 1 root secondary
[sw4]stp instance 2 root primary
[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
[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
（5）配置svi
[sw3]int vlan 1
[sw3-Vlanif1]ip address 172.16.2.1 24
[sw3-Vlanif1]int vlan 2
[sw3-Vlanif2]ip address 172.16.3.2 24
[sw4]int vlan 1
[sw4-Vlanif1]ip address 172.16.2.2 24
[sw4-Vlanif1]int vlan 2
[sw4-Vlanif2]ip address 172.16.3.1 24
（6）VRRP
[sw3]int vlanif 1
[sw3-Vlanif1]vrrp vrid 1 virtual-ip 172.16.2.254
[sw3-Vlanif1]vrrp vrid 1 priority 101
[sw3-Vlanif1]vrrp vrid 1 track interface GigabitEthernet 0/0/1 reduced 5
[sw3-Vlanif1]int vlanif 2
[sw3-Vlanif2]vrrp vrid 1 virtual-ip 172.16.3.254
[sw4]int Vlanif 1
[sw4-Vlanif1]vrrp vrid 1 virtual-ip 172.16.2.254
[sw4-Vlanif1]int vlanif 2
[sw4-Vlanif2]vrrp vrid 1 virtual-ip 172.16.3.254
[sw4-Vlanif2]vrrp vrid 1 priority 101
[sw4-Vlanif2]vrrp vrid 1 track interface GigabitEthernet 0/0/1 reduced 5
（7）DHCP
[sw3]dhcp enable
[sw3]ip pool a
[sw3-ip-pool-a]network 172.16.2.0 mask 24
[sw3-ip-pool-a]gateway-list 172.16.2.254
[sw3-ip-pool-a]dns-list 114.114.114.114
[sw3-ip-pool-a]q
[sw3]ip pool b
[sw3-ip-pool-b]network 172.16.3.0 mask 24
[sw3-ip-pool-b]gateway-list 172.16.3.254
[sw3-ip-pool-b]dns-list 114.114.114.114
[sw3-ip-pool-b]q
[sw3]int vlan 1
[sw3-Vlanif1]dhcp select global
[sw3-Vlanif1]int vlanif 2
[sw3-Vlanif2]dhcp select global
[sw4]dhcp enable
[sw4]ip pool a
[sw4-ip-pool-a]network 172.16.2.0 mask 24
[sw4-ip-pool-a]gateway-list 172.16.2.254
[sw4-ip-pool-a]dns-list 114.114.114.114
[sw4-ip-pool-a]q
[sw4]ip pool b
[sw4-ip-pool-b]network 172.16.3.0 mask 24
[sw4-ip-pool-b]gateway-list 172.16.3.254
[sw4-ip-pool-b]dns-list 114.114.114.114
[sw4-ip-pool-b]q
[sw4]interface vlanif 1
[sw4-Vlanif1]dhcp select global
[sw4-Vlanif1]int vlanif 2
[sw4-Vlanif2]dhcp select global
2、接入层
（1）创建VLAN并划分VLAN
[sw1-Ethernet0/0/1]port link-type access
[sw1-Ethernet0/0/1]port default vlan 1
[sw1-Ethernet0/0/1]stp edged-port enable
[sw1-Ethernet0/0/1]int eth0/0/2
[sw1-Ethernet0/0/2]port link-type access
[sw1-Ethernet0/0/2]port default vlan 2
[sw1-Ethernet0/0/2]stp edged-port enable
[sw2]int Eth0/0/1
[sw2-Ethernet0/0/1]port link-type access
[sw2-Ethernet0/0/1]port default vlan 1
[sw2-Ethernet0/0/1]stp edged-port enable
[sw2-Ethernet0/0/1]int eth0/0/2
[sw2-Ethernet0/0/2]port link-type access
[sw2-Ethernet0/0/2]port default vlan 2
[sw2-Ethernet0/0/2]stp edged-port enable
（2）PC端启动DHCP
3、核心层
（1）配置公网
测试：
（2）路由器和三层交换机的连通
[sw3]vlan 10
[sw3-vlan10]int vlan 10
[sw3-Vlanif10]ip address 172.16.0.1 30
[sw3-Vlanif10]int g0/0/1
[sw3-GigabitEthernet0/0/1]port link-type access
[sw3-GigabitEthernet0/0/1]port default vlan 10
[sw3]ip route-static 0.0.0.0 0 172.16.0.2
[sw4]vlan 20
[sw4-vlan20]int vlanif 20
[sw4-Vlanif20]ip add 172.16.0.6 30
[sw4-Vlanif20]int g0/0/1
[sw4-GigabitEthernet0/0/1]port link-type access
[sw4-GigabitEthernet0/0/1]port default vlan 20
[sw4]ip route-static 0.0.0.0 0 172.16.0.5
[r2]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 172.16.0.2 30
[r2-GigabitEthernet0/0/1]int g 0/0/2
[r2-GigabitEthernet0/0/2]ip add 172.16.0.5 30
[r2]ip route-static 172.16.2.0 24 172.16.0.1
[r2]ip route-static 172.16.2.0 24 172.16.0.6
[r2]ip route-static 172.16.3.0 24 172.16.0.6
[r2]ip route-static 172.16.3.0 24 172.16.0.1
（3）DNS
[r2-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[r2-acl-basic-2000]q
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]nat o
[r2-GigabitEthernet0/0/0]nat outbound 2000
四、测试
（1）测试PC端是否可以通过DHCP获取到正确的IP地址
（2）在所有设备正常运行下，测试PC端能否正常通信
（3）关闭sw3，测试PC端是否能够正常通信
（4）关闭sw4，打开sw3，测试PC端是否能够正常通信
