思科 HSRP的配置方案双机热备经典案例

思科 HSRP的配置方案双机热备经典案例

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

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回答

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Router1：

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Router1#configure terminal

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Router1(config)#interface FastEthernet 0/1

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Router1(config-if)#ip address 172.22.1.3 255.255.255.0

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Router1(config-if)#standby 1 ip 172.22.1.1

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Router1(config-if)#standby 1 priority 120

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Router1(config-if)#exit

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Router1(config)#end

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Router1#

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Router2：

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Router2#configure terminal

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Router2(config)#interface FastEthernet 1/0

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Router2(config-if)#ip address 172.22.1.2 255.255.255.0

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Router2(config-if)#standby 1 ip 172.22.1.1

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Router2(config-if)#standby 1 priority 110 (默认priority is 100)

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Router2(config-if)#exit

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Router2(config)#end

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Router2# feedom.net

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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

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提问 强制某个路由器启动后一直在组中处于主用状态

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回答

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Router1#configure terminal

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Router1(config)#interface FastEthernet 0/1

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Router1(config-if)#standby 1 ip 172.22.1.1

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Router1(config-if)#standby 1 priority 120

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Router1(config-if)#standby 1 preempt

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Router1(config-if)#exit

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Router1(config)#end

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Router1#

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Router2#configure terminal

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Router2(config)#interface FastEthernet 1/0

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Router2(config-if)#standby 1 ip 172.22.1.1

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Router2(config-if)#standby 1 priority 110

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Router2(config-if)#standby 1 preempt delay 60 (最好有时延)

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Router2(config-if)#exit

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Router2(config)#end

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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

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22.3. 配置HSRP对接口问题追踪的支持

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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

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回答

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Router1#configure terminal

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Router1(config)#interface FastEthernet0/1

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Router1(config-if)#standby 1 ip 172.22.1.1

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Router1(config-if)#standby 1 priority 120

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Router1(config-if)#standby 1 preempt

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Router1(config-if)#standby 1 track Serial0/0 20

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Router1(config-if)#exit

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Router1(config)#end

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从12.2(15)T后引入更多可追踪实例 54com.cn

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Router1#configure terminal

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Router1(config)#track 11 interface Serial1/1 ip routing

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Router1(config-track)#exit

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Router1(config)#interface FastEthernet0/0

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Router1(config-if)#standby 1 ip 172.22.1.1

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Router1(config-if)#standby 1 priority 120

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Router1(config-if)#standby 1 preempt

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Router1(config-if)#standby 1 track 11 decrement 50

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Router1(config-if)#end

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注释 Router1#show track

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Track 11

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Interface Serial1/1 ip routing

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IP routing is Down (hw admin-down, ip disabled)

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1 change, last change 00:12:48

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Tracked by:

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HSRP FastEthernet0/0 1

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22.4. HSRP负载均衡

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提问 在两台或者多台HSRP路由器上实现流量的负载均衡

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回答

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Router1#configure terminal

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Router1(config)#interface FastEthernet0/1

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Router1(config-if)#ip address