基于源目标IP策略路由
二。实验目的 1。学会灵活使用ACL 2。用策略路由使数据包走不同的数据线路传输 3。让R1的1.1.1.0/24走R2与R2的串行口 3。让数据包大于200字节的数据包走R2与R3的F0/0走。 www.zhishiwu.com 三。实验步骤 1。基本配置，R1 R2 R3配置IP地址，启用OSPF协议，在R1上建立四个网段用于测试用：1.1.1.0/24 1.1.2.0/24 1.1.3.0/24 1.1.4.0/24. 2。在R2上做策略路由 3。配置文档 只是一部分的配置，废话就不用发到上面了占地方，追求精，准，快R1#show runBuilding configuration...Current configuration : 1110 bytes!version 12.3!ip cefinterface Loopback0 ip address 1.1.2.1 255.255.255.0 secondary 主要用于测试用。 ip address 1.1.3.1 255.255.255.0 secondary ip address 1.1.4.1 255.255.255.0 secondary ip address 1.1.1.1 255.255.255.0 ip ospf network point-to-point 指定为p2p网络类型，就不会出现／３２的主机路由!interface Serial1/0 ip address 12.1.1.1 255.255.255.0 serial restart-delay 0 clock rate 64000!router ospf 10 router-id 1.1.1.1 log-adjacency-changes network 0.0.0.0 255.255.255.255 area 0!R2#sh runBuilding configuration..interface Serial1/0 ip address 12.1.1.2 255.255.255.0 ip policy route-map tor3 一个接口下只能绑定一个route-map ,但可以通过顺序号建立多个条目 serial restart-delay 0 clock rate 64000!interface Serial1/1 ip address 23.1.1.2 255.255.255.0 serial restart-delay 0 clock rate 64000router ospf 10 router-id 2.2.2.2 log-adjacency-changes network 0.0.0.0 255.255.255.255 area 0 default-information originate always 一指一条默认路由到Ｒ１与Ｒ３的路由表中O*E2 0.0.0.0/0 [110/1] via 12.1.1.2, 00:12:04, Serial1/0! ip classlessno ip http serverno ip http secure-server!!access-list 1 permit 1.1.1.0 0.0.0.255 通过ＡＣＬ控制那些数据采用策略路由转发access-list 2 permit 1.1.4.0 0.0.0.255!route-map tor3 permit 1 match ip address 1 绑定ＡＣＬ １ set ip next-hop 23.1.1.3 下一次地址!route-map tor3 permit 2 match ip address 2 match length 200 300 基于数据包大小的条件大于２００ 小于３００ set ip next-hop 213.1.1.3! www.zhishiwu.com R3#sh runBuilding configuration...Current configuration : 1147 bytesinterface Loopback0 ip address 3.3.3.3 255.255.255.0 ip ospf network point-to-point!interface Serial1/0 ip address 23.1.1.3 255.255.255.0 serial restart-delay 0 clock rate 64000router ospf 10 router-id 3.3.3.3 log-adjacency-changes network 0.0.0.0 255.255.255.255 area 0! www.zhishiwu.com ip local policy route-map tor1 我们不能将策路路由绑定在接口上，因为路由器产生的数据包不会基于策略路由转发 所以要在全局下起用。ip local policy route-map tor1route-map tor1 permit 10 match ip address 2 set ip next-hop 23.1.1.2 四。数据分析1。在做完基本配置后，我们traceroute 3.3.3.3R1# traceroute 3.3.3.3Type escape sequence to abort.Tracing the route to 3.3.3.3 1 12.1.1.2 524 msec 16 msec 164 msec 2 213.1.1.3 936 msec 704 msec 148 msec 可以看出我们的下一条不是23.1.1.3 而是F0/0出去的 www.zhishiwu.com R1#ping 在这里就不讲扩展PING的命令格式了，用多了就知道了 Protocol [ip]: Target IP address: 3.3.3.3Repeat count [5]: Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: ySource address or interface: Type of service [0]: Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: reNumber of hops [ 9 ]: Loose, Strict, Record, Timestamp, Verbose[RV]: Sweep range of sizes [n]: Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:Packet has IP options: Total option bytes= 39, padded length=40 Record route: (12.1.1.1) 但要注意，我们现在traceroute ping 的源地址不是1.1.1.1,而是12.1.1.1 (213.1.1.2) (3.3.3.3) (213.1.1.3) (12.1.1.2) (12.1.1.1) <*> (0.0.0.0) (0.0.0.0) (0.0.0.0) End of list www.zhishiwu.com 2。在R2做基于源IP的策略路由后，以下是R2 的debug ip policy*Mar 31 19:13:08.183: IP: s=1.1.1.1 (Serial1/0), d=3.3.3.3, len 68, policy match*Mar 31 19:13:08.183: IP: route map tor3, item 10, permit*Mar 31 19:13:08.187: IP: s=1.1.1.1 (Serial1/0), d=3.3.3.3 (Serial1/1), len 68, policy routed*Mar 31 19:13:08.187: IP: Serial1/0 to Serial1/1 23.1.1.3 3。在R3所有转发的数据包转发到set next-hop 23.1.1.2*Mar 31 19:30:14.815: IP: s=3.3.3.3 (local), d=1.1.1.1, len 100, policy match*Mar 31 19:30:14.819: IP: route map tor1, item 10, permit*Mar 31 19:30:14.819: IP: s=3.3.3.3 (local), d=1.1.1.1 (FastEthernet0/0), len 100, policy routed*Mar 31 19:30:14.819: IP: local to FastEthernet0/0 213.1.1.2 4.R1用1.1.4.0/24去PING R3，可以看到我们基于数据包大小的判定。*Mar 31 20:09:07.755: IP: s=1.1.4.1 (Serial1/0), d=3.3.3.3, len 210, policy match*Mar 31 20:09:07.755: IP: route map tor3, item 2, permit*Mar 31 20:09:07.759: IP: s=1.1.4.1 (Serial1/0), d=3.3.3.3 (FastEthernet0/0), len 210, policy routed*Mar 31 20:09:07.759: IP: Serial1/0 to FastEthernet0/0 213.1.1.3 www.zhishiwu.com 五：试验总结：1。一个接口下只能配置一个策略条目，可以可这样2#sh route-map route-map tor3, permit, sequence 1 可以使用多个顺序号,默认以10为步进值。Match clauses: ip address (access-lists): 1 Set clauses: ip next-hop 23.1.1.3 Policy routing matches: 3 packets, 210 bytesroute-map tor3, permit, sequence 2 Match clauses: ip address (access-lists): 2 length 200 300 Set clauses: ip next-hop 213.1.1.3 Policy routing matches: 13 packets, 2354 bytes
