该网络为中小型企业网络，要求全网互通，路由协议采用OSPF，考虑到网络的可靠性，核心交换机SW1、SW2和接入交换机采用了双链路接入，同时核心交换机之间进行了链路聚合，SW1和SW2上进行了链路冗余备份，实现了PC的冗余网关配置。
网络拓扑如下图所示：
1、为避免交换环路问题，需配置4台交换机的RSTP功能，加快网络拓扑收敛。
2、交换机之间使用trunk链路，交换机与终端设备相连端口设置为边缘端口。
3、在SW1和SW2上配置VRRP，实现主机的网关冗余，配置参数如下：
VLAN10 VRRP备份组号10 VRRP虚拟ip地址为192.168.1.254;
VLAN20 VRRP备份组号20 VRRP虚拟ip地址为192.168.2.254,
SW1为VLAN 10的master ,为VLAN20的backup，Sw2为VLAN 20的master，为VLAN 10的backup。
SW1、Sw2各VRRP组中高优先级设置为150. 低优先级设置为120。
配置备份组中的交换机工作在抢占方式，并配置抢占延迟时间为30秒，vrrp组的master交换机监听上联接口
4、Su1和SW2之间进行链路聚合。
二、路由器配置如下：
1、R1、R2使用ospf路由协议。
2、R1和下联交换机之间使用OSPF路由协议，保证网络畅通。
三、要求：
1、全网互通，查看pc1和pc2访问pc3的访问路径分别为SW1-R1-R2和SW2-R1-R2。
Sw1配置
undo info-center enable 关闭提示信息
vlan batch 10 20 30 40 创建vlan
stp mode rstp 开启stp
stp instance 0 priority 0 设置为根交换机
interface Vlanif10 创建vlanif 10
ip address 172.16.1.1 255.255.255.0 给vlanif 10 IP地址
vrrp vrid 10 virtual-ip 172.16.1.254 设置虚拟网关
vrrp vrid 10 priority 150 设置优先级
vrrp vrid 10 track interface GigabitEthernet0/0/3 reduced 70 接口出问题后优先级减少70
interface Vlanif20
ip address 172.16.2.1 255.255.255.0
vrrp vrid 20 virtual-ip 172.16.2.254
vrrp vrid 20 priority 120
vrrp vrid 20 preempt-mode timer delay 10 抢占功能，延迟10秒
interface Vlanif30
ip address 172.16.3.1 255.255.255.0
聚合链路
interface Eth-Trunk1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
mode lacp-static
trunkport GigabitEthernet 0/0/1 to 0/0/2
interface GigabitEthernet0/0/4
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/5
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/3
port link-type access
port default vlan 30
ospf
area 1
network 172.16.1.0 0.0.0.255
network 172.16.3.0 0.0.0.255sw2配置
undo info-center enable 关闭提示信息
vlan batch 10 20 30 40 创建vlan
开启stp
stp mode rstp
stp instance 0 priority 4096
interface Vlanif10
ip address 172.16.1.2 255.255.255.0
vrrp vrid 10 virtual-ip 172.16.1.254
vrrp vrid 10 priority 120
vrrp vrid 10 preempt-mode timer delay 10
interface Vlanif20
ip address 172.16.2.2 255.255.255.0
vrrp vrid 20 virtual-ip 172.16.2.254
vrrp vrid 20 priority 150
vrrp vrid 20 track interface GigabitEthernet0/0/3 reduced 70
interface Vlanif40
ip address 172.16.4.1 255.255.255.0
聚合链路
interface Eth-Trunk1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
mode lacp-static
trunkport GigabitEthernet 0/0/1 to 0/0/2
接口设置
interface GigabitEthernet0/0/3
port link-type access
port default vlan 40
interface GigabitEthernet0/0/4
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/5
port link-type trunk
port trunk allow-pass vlan 2 to 4094
ospf
area 1
network 172.16.2.0 0.0.0.255
network 172.16.4.0 0.0.0.255sw3
undo info-center enable
vlan batch 10
stp mode rstp
interface GigabitEthernet 0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet 0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface Ethernet0/0/1
port link-type access
port default vlan 10
stp edged-port enable 设置为边缘端口sw4
undo info-center enable
vlan batch 20
stp mode rstp
interface GigabitEthernet 0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet 0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094
interface Ethernet0/0/1
port link-type access
port default vlan 20
stp edged-port enableR1
undo info-center enable
interface GigabitEthernet1/0/0
ip address 172.16.5.1 255.255.255.0
interface GigabitEthernet0/0/0
ip address 172.16.3.2 255.255.255.0
interface GigabitEthernet0/0/1
ip address 172.16.4.2 255.255.255.0
ospf
area 1
network 172.16.3.0 0.0.0.255
network 172.16.4.0 0.0.0.255
network 172.16.5.0 0.0.0.255R2
undo info-center enable
interface GigabitEthernet0/0/0
ip address 172.16.5.2 255.255.255.0
interface GigabitEthernet0/0/1
ip address 172.16.6.254 255.255.255.0
ospf
area 1
network 172.16.5.0 0.0.0.255
network 172.16.6.0 0.0.0.255
