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Forum Replies

  1. system says:

    hello thank you very much. you make CCNA look very easy. you talk me thank you once again

  2. Hi Shaun,

    There is a “show key chain” command but personally I never use it. The debug will help you to figure out there is an authentication problem. The quickest method to fix it is to check the key chain in the running-config, make sure you use the same keys on both routers. Also check the interface if EIGRP authentication has been enabled.

    Good luck with the exam!


  3. dmi says:


    Is there any way to hide or restrict users from viewing the KEY (other than by assigning views or privilege levels) ?



  4. Hi again Rene,

    Why cisco decided to use this “ip authentication mode eigrp AS_NUM md5” command for enabling eigrp authentication instead of using “ip eigrp AS_NUM authentication mode md5” ??

    In the other word what is the wisdom of using “ip authentication mode eigrp AS_NUM md5” command instead of the “ip authentication eigrp AS_NUM mode md5” command where it seems more clearly ??

  5. Hello Hussein

    Cisco commands are implemented using a specific hierarchy. When you type the command ip eigrp ?, the resulting commands all have to do with EIGRP and its functionality. They are limited to routing EIGRP and nothing else. However, authentication is a different entity and must be placed within a different category. This is why the commands fall under the ip authentication keywords even though the authentication is being configured for EIGRP. Anything under the ip authentication ? will belong to the authentication functionality of the router.

    So by typing ip authentication mode eigrp AS_NUM md5 you are not configuring something specific to EIGRP but something specific to the authentication functionality of the router.

    I hope this has been helpful!


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