22.1. 配置基本HSRP
提问 "FONT-FAMILY: 宋体">当主用路由器当掉以后备份路由器可以接管主用路由器的IP地址和MAC地址
回答
Router1：
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#interface FastEthernet 0/1
Router1(config-if)#ip address 172.22.1.3 255.255.255.0
Router1(config-if)#standby 1 ip 172.22.1.1
Router1(config-if)#standby 1 priority 120
Router1(config-if)#exit
Router1(config)#end
Router1#
Router2：
Router2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#interface FastEthernet 1/0
Router2(config-if)#ip address 172.22.1.2 255.255.255.0
Router2(config-if)#standby 1 ip 172.22.1.1
Router2(config-if)#standby 1 priority 110
Router2(config-if)#exit
Router2(config)#end
Router2#
注释 由于HSRP虚拟出来的MAC地址跟组相关，所以可能会出现同一交换机收到多个相同的MAC地址的情况，这时候就需要用standby 1 mac-address 0000.0c07.ad01 命令来人工指定一个MAC地址
<!--[if !supportLists]-->22.2. <!--[endif]-->使用HSRP 强占特性
提问 强制某个路由器启动后一直在组中处于主用状态
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#interface FastEthernet 0/1
Router1(config-if)#standby 1 ip 172.22.1.1
Router1(config-if)#standby 1 priority 120
Router1(config-if)#standby 1 preempt
Router1(config-if)#exit
Router1(config)#end
Router1#
Router2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#interface FastEthernet 1/0
Router2(config-if)#standby 1 ip 172.22.1.1
Router2(config-if)#standby 1 priority 110
Router2(config-if)#standby 1 preempt
Router2(config-if)#exit
Router2(config)#end
Router2#
注释 正常情况下当LAN端口up后就会发生强占，而此时可能网络还没有收敛，所以建议配置强占延迟时间，让路由器启动后过一段时间再发起强占standby 1 preempt delay 60
22.3. 配置HSRP对接口问题追踪的支持
提问 当主用路由器的上联端口出现问题后主动切换到备用路由器
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#interface FastEthernet0/1
Router1(config-if)#standby 1 ip 172.22.1.1
Router1(config-if)#standby 1 priority 120
Router1(config-if)#standby 1 preempt
Router1(config-if)#standby 1 track Serial0/0 20
Router1(config-if)#exit
Router1(config)#end
Router1#
从12.2(15)T后引入更多可追踪实例
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#track 11 interface Serial1/1 ip routing
Router1(config-track)#exit
Router1(config)#interface FastEthernet0/0
Router1(config-if)#standby 1 ip 172.22.1.1
Router1(config-if)#standby 1 priority 120
Router1(config-if)#standby 1 preempt
Router1(config-if)#standby 1 track 11 decrement 50
Router1(config-if)#end
Router1#
注释 Router1#show track
Track 11
Interface Serial1/1 ip routing
IP routing is Down (hw admin-down, ip disabled)
1 change, last change 00:
Tracked by:
HSRP FastEthernet0/0 1