配置思路

eth-trunk　＞　创建vlan　＞　划分vlan　＞　trunk干道　＞　STP　＞　SVI　＞　VRRP　＞　DHCP

一，配置eth-trunk

SW１：
[sw1]int Eth-Trunk 0  ---创建虚拟接口
[sw1-Eth-Trunk0]trunkport GigabitEthernet 0/0/3 0/0/2　---将接口划入虚拟接口
SW２：
[sw２]int Eth-Trunk 0    
[sw２-Eth-Trunk0]trunkport GigabitEthernet 0/0/3 0/0/2

二，创建vlan，划分vlan，配置trunk干道。

SW1：
[sw1]port-group group-member  GigabitEthernet 0/0/4 GigabitEthernet 0/0/5 Eth-Trunk 0
[sw1-port-group]port link-type trunk 
[sw1-port-group]port trunk allow-pass vlan all 
SW2：
[sw2]port-group group-member  GigabitEthernet 0/0/4 GigabitEthernet 0/0/5 Eth-Trunk 0
[sw2-port-group]port link-type trunk 
[sw2-port-group]port trunk allow-pass vlan all 
SW3：
[sw3]vlan 2
[sw3]int g0/0/4
[sw3-GigabitEthernet0/0/4]port link-type access 
[sw3-GigabitEthernet0/0/4]port default vlan 2
[sw3]port-group group-member GigabitEthernet 0/0/2 GigabitEthernet 0/0/1
[sw3-port-group]port link-type trunk 
[sw3-port-group]port trunk allow-pass vlan all 
SW4：
[sw4]vlan 2
[sw4]int g0/0/4
[sw4-GigabitEthernet0/0/4]port link-type access 
[sw4-GigabitEthernet0/0/4]port default vlan 2
[sw4]port-group group-member GigabitEthernet 0/0/2 GigabitEthernet 0/0/1
[sw4-port-group]port link-type trunk 
[sw4-port-group]port trunk allow-pass vlan all 

三，配置STP

SW1 —— SW4
 stp region-configuration  ---进入MSTP组
 region-name a     ---创建名字，但其他交换机配置名必须一致
 instance 1 vlan 1  ---将VLAN按需求放入对应instance中
 instance 2 vlan 2
 active region-configuration  ---激活MST域的配置
 
[sw1]stp instance 1 root primary   ---将instan 1作为SW1的主根
[sw1]stp instance 2 root secondary  ---将instan 1作为SW1的备份根
[sw2]stp instance 1 root secondary 
[sw2]stp instance 2 root primary 
四，划分IP地址

172.16.0.0/24 
    172.16.0.0/25     ---Vlanif 1 
    172.16.0.128/25   ---Vlanif 2
    172.16.0.0/30     ---r1
    172.16.0.4/30     ---r1
五，配置VRRP

SW1：
[sw1]interface Vlanif 1 
[sw1-Vlanif1]ip address 172.16.1.1 25
[sw1-Vlanif1]vrrp vrid 1 virtual-ip 172.16.1.126    ---激活VRRP，配置虚拟网关
[sw1-Vlanif1]vrrp vrid 1 priority 110   ---修改优先级
[sw1-Vlanif1]vrrp vrid 1 track interface GigabitEthernet 0/0/1  reduced 50  ---上行链路追踪，如果上行的端口发送故障，则将网关接口的VRRP优先级降低50（默认降低10）

[sw1]interface Vlanif 2
[sw1-Vlanif2]ip address 172.16.1.129 25
[sw1-Vlanif2]vrrp vrid 1 virtual-ip 172.16.1.254

SW2：
[sw2]interface Vlanif 1
[sw2-Vlanif1]ip address 172.16.1.2 25
[sw2-Vlanif1]vrrp vrid 1 virtual-ip 172.16.1.126

[sw2]interface Vlanif 2
[sw2-Vlanif2]ip address 172.16.1.130 25
[sw2-Vlanif2]vrrp vrid 1 virtual-ip 172.16.1.254
[sw2-Vlanif2]vrrp vrid 1 priority 110
[sw2-Vlanif2]vrrp vrid 1 track interface GigabitEthernet 0/0/1 reduced 50
六，配置DHCP

[sw1]dhcp enable 
[sw1]ip pool v1
[sw1-ip-pool-v1]network 172.16.1.0 mask 25
[sw1-ip-pool-v1]gateway-list 172.16.1.126
[sw1-ip-pool-v1]q
[sw1]ip pool v2
[sw1-ip-pool-v2]network 172.16.1.128 mask 25
[sw1-ip-pool-v2]gateway-list 172.16.1.254
[sw1]int Vlanif 1
[sw1-Vlanif1]dhcp select global 
[sw1-Vlanif1]q
[sw1]int Vlanif 2
[sw1-Vlanif2]dhcp select global 

SW2：
[sw2]dhcp enable 
[sw2]ip pool v1
[sw2-ip-pool-v1]network 172.16.1.0 mask 25
[sw2-ip-pool-v1]gateway-list 172.16.1.126
[sw2-ip-pool-v1]q
[sw2]ip pool v2
[sw2-ip-pool-v2]network 172.16.1.128 mask 25
[sw2-ip-pool-v2]gateway-list 172.16.1.254
[sw2]int Vlanif 1
[sw2-Vlanif1]dhcp select global 
[sw2-Vlanif1]q
[sw2]int Vlanif 2
[sw2-Vlanif2]dhcp select global

 七，配置路由

交换机配置IP地址
因为交换机接口上不能直接配置IP地址，所以创建vlan使用虚拟接口配置

SW1：
[sw1]vlan 100
[sw1-vlan100]q
[sw1]int Vlanif 100
[sw1-Vlanif100]ip address 172.16.0.2 30
[sw1]int g0/0/1
[sw1-GigabitEthernet0/0/1]port link-type access 
[sw1-GigabitEthernet0/0/1]port default vlan 100

SW2：
[sw2]vlan 100
[sw2-vlan100]q
[sw2]int Vlanif 100
[sw2-Vlanif100]ip address 172.16.0.6 30
[sw2]int g0/0/1
[sw2-GigabitEthernet0/0/1]port link-type access 
[sw2-GigabitEthernet0/0/1]port default vlan 100

(三)启用RIP，是私网内部可达

[r1]rip
[r1-rip-1]v 2    
[r1-rip-1]network 172.16.0.0

[sw1]rip
[sw1-rip-1]v 2
[sw1-rip-1]network 172.16.0.0

[sw2]rip
[sw2-rip-1]v 2
[sw2-rip-1]network 172.16.0.0

（四）做ACL，使PC内网可以访问公网

[r1]ip route-static 0.0.0.0 0 12.0.0.2  
[r1]acl 2000
[r1-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[r1-acl-basic-2000]q
[r1]int g 0/0/0
[r1-GigabitEthernet0/0/0]nat outbound 2000