Scenario: All routers are configured in a single OSPF area. Router_C, based on the cost metric for OSPF will send all packets with a destination network address of 10.4.0.0 out the E0 interface. Problem: Have all packets destined for network 10.4.0.0 exit the Serial 0 Router_C. Router_C#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP, D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP, i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default, U - per-user static route, o - ODR Gateway of last resort is not set 10.0.0.0/16 is subnetted, 3 subnets C 10.2.0.0 is directly connected, Serial0 C 10.3.0.0 is directly connected, Ethernet0 O 10.4.0.0 [110/74] via 10.3.0.1, 00:00:13, Ethernet0 Solution: Policy routing will allow you to configure a route map. The route map will be used by the router in lieu of destination routing. In this scenario the best route to the destination network 10.4.0.0 is to go ethernet. We want to force the route to take the serial connection. Step 1 Configure a route map tag. I chose "takeserial". Step 2 Point the route map to the tag. Don’t let the 10 shake you it is just a sequence number. Router_C(config)#route-map takeserial permit ? Sequence to insert to/delete from existing route-map entry Step 3 Identify which packet should be route mapped. In our example we will match the ip address of access list 1. Step 4 Tell the router where to send the matched packet. We will send the packets to Serial 0. Current configuration: ! version 11.2 ! hostname Router_C ! ! ! interface Ethernet0 ip address 10.3.0.3 255.255.0.0 ! interface Ethernet1 ip address 10.1.0.3 255.255.0.0 ip policy route-map takeserial*Step 1 ! interface Serial0 ip address 10.2.0.1 255.255.0.0 clockrate 38400 ! interface Serial1 no ip address shutdown ! router ospf 100 network 10.0.0.0 0.255.255.255 area 0 !no ip classless access-list 1 permit 10.1.0.5 route-map takeserial permit 10 *Step 2 match ip address 1 *Step 3 set interface Serial0 *Step 4 ! line con 0 line aux 0 line vty 0 4 login ! end Now we will ping 10.4.0.2 from Workstaton A: Router_C#debug ip policy Policy routing debugging is on Router_C# IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2, len 74, policy match IP: route map takeserial, item 10, permit IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2 (Serial0), len 74, policy routed IP: Ethernet1 to Serial0 10.4.0.2 IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2, len 74, policy match IP: route map takeserial, item 10, permit IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2 (Serial0), len 74, policy routed IP: Ethernet1 to Serial0 10.4.0.2 IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2, len 74, policy match IP: route map takeserial, item 10, permit IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2 (Serial0), len 74, policy routed IP: Ethernet1 to Serial0 10.4.0.2 IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2, len 74, policy match IP: route map takeserial, item 10, permit IP: s=10.1.0.5 (Ethernet1), d=10.4.0.2 (Serial0), len 74, policy routed IP: Ethernet1 to Serial0 10.4.0.2
Lab 02 - Policy Routing The following scenario refers to the diagram below.
声明：本站所有内容，如无特殊说明或标注，均为本站原创或通过网络收集整理并发布。如若本站内容侵犯了原著者的合法权益，可联系我们进行处理。