Policy Based Routing Sim
Question
Company TUT has two links to the Internet. The company policy requires that web traffic must 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(config)#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
BorderRouter(config-route-map)#exit
(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.”
Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a4409.shtml)
| Note: We don’t need to use IP SLA to track the next-hop IP address as the “set ip next-hop” did this. From this link: https://www.cisco.com/c/en/us/support/docs/ip/ip-routed-protocols/47121-pbr-cmds-ce.html “The set ip next-hop command verifies the existence of the next hop specified, and… + If the next hop exists in the routing table, then the command policy routes the packet to the next hop. + If the next hop does not exist in the routing table, the command uses the normal routing table to forward the packet.” So if the next-hop 10.1.101.1 goes down the PBR will use normal routing table. |
3) Apply the route-map on the interface to the server in the EIGRP Network:
BorderRouter(config-route-map)#exit
BorderRouter(config)#int fa0/0
BorderRouter(config-if)#ip policy route-map pbr
BorderRouter(config-if)#exit
BorderRouter(config)#exit
4) There is a “Host for Testing”, click on this host to open a box which includes 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”.
BorderRouter#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.
Note: We have posted a Policy Based Routing lab on GNS3 similar to this sim with detailed explanation, you can read it here.
Other lab-sims on this site:
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I believe there should be a “(config-router)#route-map pbr permit 20” statement added to the BorderRouter so that other traffic is not denied?
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Iam going to take exam in 9 days, i noticed in full describtion that it states “IT policy requires all outbound HTTP traffic use frame relay link when it is available.” Doesnt this require ip sla configuration either? Can somebody comfirm?
Iam sorry i missed the “note” nvm than…
(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.”
This it true, and i wouldn’t add it on the exam, but in a lab if you add that clause, when you do a show ip route-map, the counters will increase for normal traffic – helps verify everything is working
never mind above post, doesn’t increase counters – nothing to match!!!
I give all commands but at the end when i give
show ip route-map nothing match. why?
“For the purpose of practice in a GNS3 environment utilize “echo” instead of “www” in your access list and just ping ISP2 from “Host_For_Testing” to verify accurate completion of task”
try with this comment in gns3 sim file. good luck.
you may give original commands(“www”) and test with tel 10.1.102.1 80
it will generate http traffic, so the matching counters would be increase itk
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Thank you netwrokkkingg . Thankyou digitaltut.
Good luck
Doesnt web traffic include https as well? Shouldnt we add tcp port 443 as well?
the question says web traffic, the picture only states http – but could be a good thing to look out for on a test.
Thanks Peter Plan and Helper
There are a lot of testers and professional teachers to study and discuss together, as well as the latest test resources. Candidates who need the test can come and see. ht tp:
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HTTP only: The requirement is: 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. HTTPS is not a part of the requirement so 443 does not need to be a part of the access-list or PBR.
Hmm..
I dont know why, but my routemap is not getting matches.. and yes, i used echo instead of www or 80
a trace route shows the traffic just going using the routing table.. bug?
Why are You applying route-map to the redistribution ??
Won’t it work the same without it ?
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@Zamtaker – try adding this ACL: access-list 101 permit icmp any any. Afterward, you should see some matches in the Policy Routing matches: 5 packets…
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Any BGP sim for this exam??? I have trained only the following sims but they seem to be easy for the supposed level of this certificate…
EIGRP Stub Simulator
EIGRP OSPF Redistribute Simulator
Policy Based Routing Simulator
IPv6 OSPF Virtual Link Simulator
OSPF Simulator
OSPF Evaluation Simulator
EIGRP Evaluation Simulator
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