HSRP抢占和接口追踪

拓扑图

 

实验过程

1.       pc1的预配置

Router>en Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line con 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host pc1 pc1(config)#no ip routing pc1(config)#int e0/0 pc1(config-if)#no shut pc1(config-if)#ip add 192.168.1.1 255.255.255.0 pc1(config-if)#exit pc1(config)#ip default-gateway 192.168.1.254 pc1(config)#end

2.       pc2的预配置

Router>en Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line con 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host pc2 pc2(config)#no ip routing pc2(config)#int e0/0 pc2(config-if)#no shut pc2(config-if)#ip add 192.168.2.1 255.255.255.0 pc2(config-if)#exit pc2(config)#ip default-gateway 192.168.2.254 pc2(config)#end

3.       R1的配置

Router>en Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line con 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R1 R1(config)#int f1/0 R1(config-if)#no shut R1(config-if)#ip add 192.168.1.10 255.255.255.0 R1(config-if)#standby 10 ip 192.168.1.254 R1(config-if)#standby 10 preempt   R1(config-if)#int f1/1 R1(config-if)#no shut R1(config-if)#ip add 192.168.2.10 255.255.255.0 R1(config-if)#standby 20 ip 192.168.2.254 R1(config-if)#standby 20 pree  //开启抢占功能 R1(config-if)#standby 20 pri 150  //设置优先级 R1(config-if)#standby 20 track f1/0 80  //开启接口追踪 R1(config-if)#end

4.       R2的配置

Router#conf t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line con 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host R2 R2(config)#int f1/0 R2(config-if)#no shut R2(config-if)#ip add 192.168.1.20 255.255.255.0 R2(config-if)#standby 10 ip 192.168.1.254 R2(config-if)#standby 10 pree R2(config-if)#standby 10 pri 150 R2(config-if)#standby 10 track f1/1 80 R2(config-if)#int f1/1 R2(config-if)#no shut R2(config-if)#ip add 192.168.2.20 255.255.255.0 R2(config-if)#standby 20 ip 192.168.2.254 R2(config-if)#standby 20 preempt R2(config-if)#end

5.       查看HSRP信息

R1#show standby br                      P indicates configured to preempt.                      | Interface   Grp Prio P State    Active          Standby         Virtual IP     Fa1/0     10  100   Standby   192.168.1.20 local           192.168.1.254  Fa1/1    20  150  P Active   local           192.168.2.20    192.168.2.254 R2#show standby br                      P indicates configured to preempt.                      | Interface   Grp Prio P State    Active          Standby         Virtual IP     Fa1/0    10  150  P Active   local           192.168.1.10    192.168.1.254  Fa1/1    20  100  Standby  192.168.2.10       local     192.168.2.254

说明：现在R1的f1/1是Active状态，f1/0是Standby状态；R2的f1/0是Active状态，f1/1是Standby状态。

 

6.       测试连通性

pc1#ping 192.168.2.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/36/80 ms pc1#traceroute 192.168.2.1   Type escape sequence to abort. Tracing the route to 192.168.2.1     1 192.168.1.20 72 msec 32 msec 12 msec 2 192.168.2.1 8 msec *  52 msec pc2#ping 192.168.1.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/40/92 ms pc2#tra pc2#traceroute 192.168.1.1   Type escape sequence to abort. Tracing the route to 192.168.1.1     1 192.168.2.10 28 msec 32 msec 8 msec   2 192.168.1.1 20 msec *  28 msec

说明：现在pc1到pc2走R2，pc2到pc1走R1.

 

7.       模拟故障，关闭R1的f1/0接口

R1(config)#int f1/1 R1(config-if)#shut R1(config-if)#end R2#show standby bri                      P indicates configured to preempt.                      | Interface   Grp Prio P State    Active        Standby         Virtual IP     Fa1/0    10  150   P  Active  local       192.168.1.10    192.168.1.254  Fa1/1      20  100  P Active   local       unknown       192.168.2.254

说明：现在R2的两个接口都变成Active状态了。

 

8.       测试连通性

pc1#ping 192.168.2.1        Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 24/43/80 ms pc1#traceroute 192.168.2.1   Type escape sequence to abort. Tracing the route to 192.168.2.1     1 192.168.1.20 56 msec 48 msec 40 msec       2 192.168.2.1 12 msec *  32 msec pc2#ping 192.168.1.1        Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/48/76 ms pc2#traceroute 192.168.1.1   Type escape sequence to abort. Tracing the route to 192.168.1.1     1 192.168.2.20 48 msec 48 msec 20 msec       2 192.168.1.1 8 msec *  36 msec

说明：现在可以看到pc1和pc2的流量都走R2.

 

9.       打开R1的f1/1接口

R1(config)#int f1/1 R1(config-if)#no shut R1(config-if)#end R1# R1#show standby bri                      P indicates configured to preempt.                      | Interface   Grp Prio P State    Active          Standby         Virtual IP     Fa1/0  10  100  P Standby  192.168.1.20    local           192.168.1.254  Fa1/1  20  150  P Active   local           192.168.2.20    192.168.2.254

说明：R1抢占回了自己的f1/1接口的地位，并且优先级又加回来了。

 

10.   测试连通性

pc1#ping 192.168.2.1        Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 24/32/44 ms pc2#ping 192.168.1.1        Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/36/68 ms

11.   模拟故障，关闭R2的f1/0接口

R2(config)#int f1/0 R2(config-if)#shut R2(config-if)#end R1#show standby br                      P indicates configured to preempt.                      | Interface   Grp Prio P State    Active          Standby         Virtual IP     Fa1/0  10  100  P Active   local           unknown         192.168.1.254  Fa1/1  20  150  P Active   local           192.168.2.20      192.168.2.254

12.   测试连通性

pc1#ping 192.168.2.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 16/36/56 ms pc1#traceroute 192.168.2.1   Type escape sequence to abort. Tracing the route to 192.168.2.1     1 192.168.1.10 92 msec 32 msec 20 msec       2 192.168.2.1 12 msec *  28 msec pc2#ping 192.168.1.1        Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/43/56 ms pc2#traceroute 192.168.1.1   Type escape sequence to abort. Tracing the route to 192.168.1.1     1 192.168.2.10 104 msec 28 msec 4 msec       2 192.168.1.1 20 msec *  36 msec