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Forum Replies

  1. why are u running this command and please also tell me what are med and local preference.

    neighbor route-map MED out

    i think it should be

    neighbor route-map MED in

    please clear it

  2. First of Congratulation Rene…for ur CCIE Number… U deserve it. The lab u post & the way u write article in most simple form is simply amazing. Why don’t u start writing books for CCIE R&S TS… I would love to hv one in my collection. Wish u all the success. I m a fan of ur blog who is chasing the dream of CCIE R&S.

  3. Hi Kandhla,

    It’s up to the network engineers / ISPs but there is one key difference between AS path prepending and MED:

    • When you use AS path prepending, it will show up at your neighbor AS and all other ASes behind them.
    • When you use MED, it will show up at your neighbor but NOT at any AS behind them.


  4. Errata:
    MED (also called metric) is exchanged between autonomous systems and you can use it to let the other AS know which path they should use to enter your AS. R2 is sending a MED of 200 towards AS 3. R3 is sending a MED of 300 to AS 3. AS 3 will prefer the lower metric and send all traffic for AS 1 through AS 1. <------- R2

  5. Hello Rawaz.

    If I understand correctly, your scenario involves a dual homed BGP topology and you want to know how to control, or at least influence, inbound traffic, correct?

    Because inbound traffic is essentially sent to you, you do not have the ultimate control of how traffic enters your AS. Your ISP may have outbound policies that will always override all of your attempts to influence inbound traffic. However, you do have the option of influencing inbound traffic. There are several ways to do this including:

    * Leaking more specific routes
    * Using the MED

    ... Continue reading in our forum

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