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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://networkl

    ... Continue reading in our forum

  3. Hello Lee

    Looking a little deeper into the issue, looking at the router configurations, the router IDs of both R2 and R3 are indeed the same as both Lo interfaces are set to 2.2.2.2. So according to BGP route selection process, if the router IDs are the same, then the router will prefer the route with the lowest neighbour IP address. So between R2 and R3, the lowest neighbour IP address is indeed 192.168.12.2, so R2 will be chosen as the path.

    So the following statement in the lesson has to be revised:

    https://cdn-forum.networklessons.com/uploads/default/orig

    ... Continue reading in our forum

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

  5. Hi Rene,
    Thanks for replying me…yes after set the router id in R3 now everything is up and not getting identifier error:smiley:

    R3#sh running-config | include bgp
    router bgp 2
    bgp router-id 1.1.1.1
    bgp log-neighbor-changes
    
    R3#sh ip bgp summary
    BGP router identifier 1.1.1.1, local AS number 2
    BGP table version is 1, main routing table version 1
    2 network entries using 288 bytes of memory
    2 path entries using 160 bytes of memory
    2/0 BGP path/bestpath attribute entries using 272 bytes of memory
    0 BGP route-map cache entries using 0 bytes of memory
    0 BGP filter-li
    ... Continue reading in our forum

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