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Home Forums How to configure EIGRP Authentication

This topic contains 16 replies, has 8 voices, and was last updated by   Rene Molenaar 10 months, 1 week ago.

Viewing 15 posts - 1 through 15 (of 16 total)
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  • #14579


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



    awesome lessons, simple and clearly documented.


    Chandan K

    I really like the way you explain the things..its simple,clear and easy to understand.


    alok d

    What is an AS number? Thanks.


    Rene Molenaar

    AS stands for Autonomous System.

    An AS is basically a network that falls under one administrative entity. On the Internet we use AS numbers and BGP for routing between autonomous systems. Within an AS, we typically use an IGP like OSPF or EIGRP.

    Here’s a list with AS numbers that are used on the Internet:




    alok d

    I am familiar with Autonomous System, ASBR etc. it is made very clear in OSPF chapters.

    I got bit confused with how EIGRP uses AS numbers, whereas OSPF prefers process and area no. Etc.

    So AS number for EIGRP is not locally significant but it has to be same on all routers within an AS?



    Rene Molenaar

    Hi AD,

    That’s right. EIGRP uses an “AS” number which has to be the same on all routers that run EIGRP.

    OSPF uses a process ID and has no concept of AS so it doesn’t matter what number you pick, it’s only used locally on the router.



    Victor R

    Hi Rene,

    Can you talk about the other EIGRP authentication using SHA under EIGRP named mode?

    Thank you



    Rene Molenaar

    Hi Victor,

    Sure, I’ll add a configuration example for this in a few days. I’ll let you know once it’s done.



    Victor R

    Hi Rene,

    Great thank you.


    husam s

    Dear Rene ,

    i enabled the eigrp auth without selecting the mode in both router
    and it is working .
    after i issue the mode command in one router it refuse ,
    that mean its by default using clear text auth , or different than MD5 could you check that .


    Rene Molenaar

    Hi Husam,

    If you don’t specify the mode then the router doesn’t use EIGRP authentication.



    Makara N

    Dear Rene,

    In case we have many interfaces advertised prefixes, is it possible to process Authentication globally without running authentication at each interface level?

    If yes, can you please show how to configure it.



    Makara Ngy


    Rene Molenaar

    Dear Makara,

    It would be very useful but unfortunately EIGRP doesn’t support this. Authentication is always enabled on the interface level.



    shaun y

    hi rene if I was trouble shooting a failed eigrp neighbour is there a show command to see if the key chains are configured ok or do I just have to look at the debug output for this thanks keep up the good work as i’m almost ready to sit my ccnp route exam because of you easy to understand site

Viewing 15 posts - 1 through 15 (of 16 total)

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