Junos Cup 2014
Junos Cup 2014

Tournament 3: Ivory Coast Challenge & Solution: OSPF and L3VPN Customized Connectivity

[ Edited ]
‎06-26-2014 07:15 AM

Country Flag: IVORY COAST


Author: Víctor Rodríguez


Title: OSPF and L3VPN Customized Connectivity


Type: Service Provider


Difficulty: High (2 points).


Technical Description: Using one single configuration command, make network 2.2.2/24 only reachable inside site 1 (CE1 and CE3) while 1.1.1/24 is also reachable from site 2 (CE2).






Challenge Instructions

For this challenge, you need to start the topology called: “IVORY COAST – OSPF and L3VPN Customized Connectivity”.


The topology shows a L3VPN that uses OSPF as IGP. All CE routers belong to OSPF area 1.


CE1 has interfaces ge-0/0/2.0 with an address, and ge-0/0/3.0 with an address Both interfaces connect to LANs where servers are going to be connected. None of the interfaces participate in the OSPF process.


With the current configuration LANs 1.1.1/24 and 2.2.2/24 can be reached from site 1 (CE1 and CE3) and site 2 (CE2).


The goal of this challenge is to modify the configuration in such way that network 1.1.1/24 can be reached from all CEs while network 2.2.2/24 can only be reached inside site 1 (CE1 and CE3). You need to achieve this goal with just one configuration command in just one router, like this:



<command1>  /* load is not permitted */

commit and-quit


These are the conditions your solution must meet:


-       You are not allowed to modify the configuration of CE2 or PE2.

-       CE2 only has to lose connectivity to prefix 2.2.2/24, while maintaining connectivity to the rest of OSPF routes.


To solve this challenge, submit the single set command allowed and the router where it is applied.


NOTE: If you have issues connecting to the Junosphere topology please check Junosphere Technical documentation, or request assistance in the Junosphere forum 

Send an email with your proposed solution to junos-cup@juniper.net:

  •  The subject should be “<country-name-of-the-challenge> -  <your-full-name>”. For example: “Brazil – Wolfgang Amadeus Mozart”.
  • In the email body, please include your proposed solution, along with your first and last name and complete mailing address including zip/postal code and your shirt size (S, M, L, XL, XXL, XXXL) (Only if you haven’t already submitted your address/shirt size on a previous submission)

Deadline to Respond: Tuesday, 1st of July 23:59:59 Pacific Daylight Time (PDT) 

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Some additional notes:

  • You can try to solve and submit answers for as many active challenges as you wish
  • The answers will be read by the organization right after the deadline
  • The challenge instructions are final, and no additional information or tips will be provided before the publication of the solution and the winner list. Please don’t expect a reply from junos-cup@juniper.net.
  • If you feel that your initial solution is wrong or incomplete, you can send up to three messages for the same challenge, but please note that only your last message (received before the deadline) will be read.
  • If you think there is an error in the definition of the challenges, please send us an email with subject (“<country-name> ERROR”); if there is no reply, then it’s likely an intentional condition of the challenge, rather than an error.




juniper@CE1# set policy-options policy-statement toospf term 2 then tag add 3489661028   


Julie Wider
Advocacy Manager
Twitter: @JNetCommunity & @jawider