3台服务器提供WEB服务，通过防火墙进行负载均衡，通过地址192.168.10.100地址作为vip。

FW配置如下：

#开启负载均衡功能
 slb enable
#
interface GigabitEthernet1/0/6
 undo shutdown
 ip address 192.168.10.254 255.255.255.0
 service-manage ping permit
#
firewall zone trust
 set priority 85
 add interface GigabitEthernet0/0/0
 add interface GigabitEthernet1/0/6
#进入SLB视图                               
 slb
#配置SLB的会话保持
  persistence 0 HTTP_Servers
   type cookie-insert
#配置服务器组
  group 0 HTTP_Servers
#设置负载均衡算法，这里使用轮询
   metric weight-roundrobin
#设置健康检查
   health-check type http port 80
#配置服务器及权重
   rserver 0 rip 192.168.10.1 port 80 weight 1 description server-1
   rserver 1 rip 192.168.10.2 port 80 weight 1 description server-2
   rserver 2 rip 192.168.10.3 port 80 weight 1 description server-3
   action optimize
#配置虚拟服务器
  vserver 0 HTTP_Servers
   vip 0 192.168.10.100
   protocol http
   vport 80
   group HTTP_Servers
   persistence HTTP_Servers
#