提问 "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
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
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 (默认priority is 100)
Router2(config-if)#exit
Router2(config)#end
Router2# feedom.net

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

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
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
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       delay 60 (最好有时延)
Router2(config-if)#exit
Router2(config)#end

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
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

从12.2(15)T后引入更多可追踪实例 54com.cn

Router1#configure terminal
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

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 00:12:48
Tracked by:
HSRP FastEthernet0/0 1

22.4.    HSRP负载均衡

提问 在两台或者多台HSRP路由器上实现流量的负载均衡

回答

Router1#configure terminal
Router1(config)#interface FastEthernet0/1
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)#standby 1 preempt
Router1(config-if)#standby 2 ip 172.22.1.2
Router1(config-if)#standby 2 priority 110
Router1(config-if)#standby 2 preempt
Router1(config-if)#exit
Router1(config)#end

Router2#configure terminal
Router2(config)#interface FastEthernet1/0
Router2(config-if)#ip address 172.22.1.4 255.255.255.0
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)#standby 2 ip 172.22.1.2
Router2(config-if)#standby 2 priority 120
Router2(config-if)#standby 2 preempt
Router2(config-if)#exit
Router2(config)#end

注释 由于出现两个网关，所以需要在终端设备上分开配置各自的缺省网关。

22.5.    HSRP中ICMP重定向

提问 在HSRP中启用ICMP重定向

Router2#configure terminal
Router2(config)#interface FastEthernet 1/0
Router2(config-if)#no ip redirects
Router2(config-if)#standby redirects disable
Router2(config-if)#exit
Router2(config)#end
Router2# 54ne.com

注释

22.6.    调整HSRP定时器

提问 调整备份路由器接管主用路由器所需时长

Router1#configure terminal
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 timers 1 3
Router1(config-if)#exit
Router1(config)#end
Router1#

注释 缺省Hello包时长为3秒，10秒后会接管，如果主用路由器调整时长，整个组内的路由器都要调整为相同的时长。最短可以到达毫秒Router1(config-if)#standby 1 timers msec 100 msec 300           

Router1#configure terminal
Router1(config)#interface Tokenring0
Router1(config-if)#ip address 172.22.1.3
Router1(config-if)#standby ip 172.22.1.1
Router1(config-if)#standby use-bia
Router1(config-if)#standby priority 120
Router1(config-if)#standby preempt
Router1(config-if)#exit
Router1(config)#end
Router2#configure terminal
Router2(config)#interface Tokenring0
Router2(config-if)#ip address 172.22.1.2
Router2(config-if)#standby ip 172.22.1.1
Router2(config-if)#standby use-bia
Router2(config-if)#standby priority 110
Router2(config-if)#standby preempt
Router2(config-if)#exit

注释 由于令牌环网络会用到设备的MAC地址信息，所以如果HSRP用到虚拟MAC就会出问题，因此在配置中使用了burned-in address (BIA)来代替MAC来避免出现问题