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[CCNP 642-902 Router ] [ Policy Based Routing Sim ] CCNP Sim 문제 본문
[CCNP 642-902 Router ] [ Policy Based Routing Sim ] CCNP Sim 문제sungchan41 2014. 1. 6. 08:25
% CCNP Router 에서는 시뮬레이션 문제가 총 5개 출제되고 있습니다.
Company Acan has two links which can take it to the Internet. The company policy demands that you use web traffic to be forwarded only to Frame Relay link if available and other traffic can go through any links. No static or default routing is allowed.
Answer and Explanation:
Notice: The answer and explanation below are from PeterPan and Helper.Please say thank to them!
All the HTTP traffic from the EIGRP Network should go through Frame Relay link if available and all the other traffic should go through either link.
The only router you are able to administrate is the Border Router, from the EIGRP Network you may only send HTTP traffic. As the other people mentioned, actually it is not a BGP lab. You are not able to execute the command “router bgp 65001″
1) Access list that catches the HTTP traffic:
BorderRouter#access-list 101 permit tcp any any eq www
Note that the server was not directly connected to the Border Router. There were a lot of EIGRP routes on it. In the real exam you do not know the exact IP address of the server in the EIGRP network so we have to use the source as “any” to catch all the source addresses.
2) Route map that sets the next hop address to be ISP1 and permits the rest of the traffic:
BorderRouter(config)#route-map pbr permit 10
BorderRouter(config-route-map)#match ip address 101
BorderRouter(config-route-map)#set ip next-hop 10.1.101.1
(Update: We don’t need the last command route-map pbr permit 20 to permit other traffic according to Cisco:
“If the packets do not meet any of the defined match criteria (that is, if the packets fall off the end of a route map), then those packets are routed through the normal destination-based routing process. If it is desired not to revert to normal forwarding and to drop the packets that do not match the specified criteria, then interface Null 0 should be specified as the last interface in the list by using the set clause.”
3) Apply the route-map on the interface to the server in the EIGRP Network:
BorderRouter(config-if)#ip policy route-map pbr
4) There is a “Host for Testing”, click on this host to open a box in which there is a button named “Generate HTTP traffic”. Click on this button to generate some packets for HTTP traffic. Jump back to the BorderRouter and type the command “show route-map”.
In the output you will see the line “Policy routing matches: 9 packets…”. It means that the route-map we configured is working properly.
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