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Notable Replies

  1. system says:

    In AS 2 you have named but nowwhere you have configured jim....you have configured JACK ....in the second Diagram consisting of 3 routers you have named them James , jim , john....should i assume jim as Jack?....Excellent explanation by the way .....

  2. system says:

    Thanks Master.

  3. Rene,
    Great lesson however, I have questions if we have two ISPs and we would like to route traffic out through ISP-1. It means we need to set up a higher weight on the ISP-1 peering with us and setup a lower weight on the second ISP-2?
    How can we make sure traffic goes out ISP-1 and comes back in using ISP-2?


  4. Hi Hamood,

    That's right, you can use weight to select the path but this is only for the local router. If you want to influence your entire AS then you'll have to use local preference:


    To influence how traffic enters our AS we have a couple of methods, the first one is MED:


    This is only useful when you are multihomed to a single ISP. These two methods will help if you are multihomed to different ISPs:



    Hope this helps!


  5. Hi William,

    Weight is the first attribute that is used to determine the best path. Here's a nice way to remember the attributes, something I found on a blog a long time ago:

    “We Love Oranges AS Oranges Mean Pure Refreshment”

    W Weight (Highest)
    L LOCAL_PREF (Highest)
    O Originate (local) routes that are advertise through the "network" command or redistributed from an IGP.
    AS AS_PATH (shortest)
    O ORIGIN Code (IGP > EGP > Incomplete)
    M MED (lowest)
    P Paths (External > Internal)
    R RID (lowest)


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