实验目标：在华为设备上配置vrrp+dhcp,检测vrrp对dhcp是否有影响
目标拓扑：
配置思路：在R1，R2，R3，SW2，SW3上运行ospf路由协议以使全网路由互通，SW2，SW3上配置vrrp+dhcp
;SW4,SW1为普通二层交换机负责接入
配置步骤：1、配置设备接口IP及直连测试
R3：
sys
sysname R3
int lo0
ip addr 3.3.3.3 255.255.255.255
quit
vlan batch 100 200 300
int vlan 100
ip addr 13.1.1.3 255.255.255.0
un sh
int vlan 200
ip addr 23.1.1.3 255.255.255.0
un sh
int vlan 300
ip addr 33.1.1.3 255.255.255.0
un sh
int e0/0/0
port link acc
port de vl 100
int e0/0/2
port lin acc
port de vl 200
int e0/0/1
port link acc
port de vlan 300
quit
dis ip int bri
========================================
R1:
sys
sysname R1
int g0/0/0
ip addr 13.1.1.1 255.255.255.0
int g0/0/2
ip addr 12.1.1.1 255.255.255.0
int g0/0/1
ip addr 10.10.10.1 255.255.255.0
int lo0
ip addr 1.1.1.1 255.255.255.255
quit
dis ip int bri
========================================
R2:
sys
sysname R2
int g0/0/0
ip addr 23.1.1.2 255.255.255.0
int g0/0/2
ip addr 12.1.1.2 255.255.255.0
int g0/0/1
ip addr 20.20.20.2 255.255.255.0
int lo0
ip addr 2.2.2.2 255.255.255.255
quit
dis ip int bri
========================================
SW2:
sys
sysname SW2
vlan batch 10 100 200
int vlan 10
ip addr 10.10.10.2 255.255.255.0
int vlan 100
ip addr 100.1.1.254 255.255.255.0
int vlan 200
ip addr 200.1.1.253 255.255.255.0
int g0/0/1
port link acc
port de vlan 10
int g0/0/2
port link-ty tr
port tr al vl 100 200
int g0/0/4
port link acc
port de vl 200
int lo0
ip addr 11.11.11.11 255.255.255.255
==========================================
SW3:
sys
sysname SW3
vlan batch 20 100 200
int vlan 20
ip addr 20.20.20.3 255.255.255.0
int vlan 100
ip addr 100.1.1.253 255.255.255.0
int vlan 200
ip addr 200.1.1.254 255.255.255.0
int g0/0/1
port lin acc
port de vlan 20
int g0/0/2
port lin tr
port tr al vla 100 200
int lo0
ip addr 22.22.22.22 255.255.255.255
直连测试：各设备之间直连互通
2、配置ospf路由协议并测试
R3：
ospf 110 router-id 3.3.3.3
area 0
net 33.1.1.0 0.0.0.255
net 13.1.1.0 0.0.0.255
net 23.1.1.0 0.0.0.255
net 3.3.3.3 0.0.0.0
R1:
ospf 110 router-id 1.1.1.1
area 0
net 10.10.10.0 0.0.0.255
net 13.1.1.0 0.0.0.255
net 12.1.1.0 0.0.0.255
net 1.1.1.1 0.0.0.0
R2:
ospf 110 router-id 2.2.2.2
area 0
net 23.1.1.0 0.0.0.255
net 12.1.1.0 0.0.0.255
net 20.20.20.0 0.0.0.255
net 2.2.2.2 0.0.0.0
SW2:
ospf 110 router-id 11.11.11.11
area 0
net 10.10.10.0 0.0.0.255
net 11.11.11.11 0.0.0.0
net 100.1.1.0 0.0.0.255
net 200.1.1.0 0.0.0.255
SW3:
ospf 110 router-id 22.22.22.22
area 0
net 20.20.20.0 0.0.0.255
net 22.22.22.22 0.0.0.0
net 100.1.1.0 0.0.0.255
net 200.1.1.0 0.0.0.255
检测：检查以上设备之间邻居是否正常
dis ospf peer bri
检查所有设备到33.1.1.3都能通信
3、在SW2和SW3上配置vrrp+dhcp
SW2:
dhcp enable
ip pool 100
network 100.1.1.0 mask 255.255.255.0
gateway-list 100.1.1.250
excluded-ip-address 100.1.1.253 100.1.1.254
quit
ip pool 200
network 200.1.1.0 mask 255.255.255.0
gateway-list 200.1.1.250
excluded-ip-address 200.1.1.253 200.1.1.254
quit
int vlan 100
dhcp select global
vrrp vrid 1 virtual-ip 100.1.1.250
vrrp vrid 1 priority 120
vrrp vrid 1 track interface g0/0/1 reduced 20
vrrp vrid 1 preempt-mode timer delay 5
int vlan 200
dhcp select global
vrrp vrid 2 virtual-ip 200.1.1.250
vrrp vrid 2 priority 110
vrrp vrid 2 track interface g0/0/1 reduced 20
vrrp vrid 2 preempt-mode disable
=============================================
SW3:
dhcp enable
ip pool 100
network 100.1.1.0 mask 255.255.255.0
gateway-list 100.1.1.250
excluded-ip-address 100.1.1.253 100.1.1.254
quit
ip pool 200
network 200.1.1.0 mask 255.255.255.0
gateway-list 200.1.1.250
excluded-ip-address 200.1.1.253 200.1.1.254
quit
int vlan 100
dhcp select global
vrrp vrid 1 virtual-ip 100.1.1.250
vrrp vrid 1 priority 110
vrrp vrid 1 track interface g0/0/1 reduced 20
vrrp vrid 1 preempt-mode disable
int vlan 200
dhcp select global
vrrp vrid 2 virtual-ip 200.1.1.250
vrrp vrid 2 priority 120
vrrp vrid 2 track interface g0/0/1 reduced 20
vrrp vrid 2 preempt-mode timer delay 5
检查：dis vrrp brief
此时由于并没有配置SW1，所以SW2和SW3之间无法传递广播包，故vrrp报文不能在SW2，SW3之间传递，所以针对于vlan100,vlan200而言，在SW2，SW3上均为主，没有备
配置SW1：
sys
sysname SW1
vlan batch 100 200
int g0/0/1
port link trunk
port tr al vlan 100 200
int g0/0/2
port link trunk
port tr al vlan 100 200
int g0/0/3
port link acc
port de vlan 100
int g0/0/5
port link acc
port de vlan 200
int g0/0/6
port link acc
port de vlan 100
int g0/0/4
port link acc
port de vlan 200
当配置完SW1之后则SW2：
SW3：
4、配置客户端测试
CLENET3配置IP为33.1.1.120
CLIENT1,CLIENT5,CLIENT6,CLIENT4均自动获取IP
此时若SW2，SW3下行链路故障则需要丢20个左右的包，而上行链路由于配置了track，当上行链路发生故障时能平滑切换，不会丢包。
5、配置BFD应用于下行链路