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Forum Replies

  1. 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?
    Thanks

    Hamood

  2. 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:

    https://networklessons.com/bgp/how-to-configure-bgp-local-preference-attribute/

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

    https://networklessons.com/bgp/how-to-configure-bgp-med-attribute/

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

    https://networklessons.com/bgp/how-to-configure-bgp-as-path-prepending/

    https://networklessons.com/bgp/bgp-communities-explained/

    Hope this helps!

    Rene

  3. Hi Rene,

    Off topic, I don't see topic conditional advertisement. Will you be adding this in future?

    thanks in advance.

    KR
    Zeeshan

  4. lee says:

    Thanks Laz, But on the diagram we have loopbacks on both R2 and R3 of 2.2.2.0/24 so as per the Router Id election process surely the router id of both R2 and R3 should be 2.2.2.2 ?

    Thanks

  5. lee says:

    Thanks Laz for clarifying that for me and the prompt response.

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