dual peer ebgp

Discussion in 'Cisco' started by mmark751969, Mar 25, 2008.

  1. mmark751969

    mmark751969 Guest

    i have a 7206 configuration that is running ebgp. This happens to be
    running ebgp between 2 peers within the same isp however(same remote-
    as number. Both of the peers have different ip addresses though).
    This isp is handing us a 100mb ethernet connection over fiber. Just
    wondering if it is accepted practice to be running ebgp this way
    instead of having the peers at different isp's.
    mmark751969, Mar 25, 2008
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  2. p_teatreeoil

    p_teatreeoil Guest

    There are some advantages to being dual homed. You can be more
    granular with your prefixes since your ISP will accept ones that are
    longer than 24 bits (this is useful if your connections terminate on
    different PE routers). Or, if your links both terminate on the same
    PE router, you can load balance your traffic with multipath. Being
    dual-homed to the same ISP is a lot less complicated than being multi-
    homed, but you give up the advantage of being able to optimize based
    on peering diversity between different ISPs.

    Your situation is not unique and there is nothing wrong with doing it
    that way; you're still getting at least some redundancy and it's a lot
    easier to get started with one ISP. If and when you decide to move
    on to ISP diversity, you'll want to be sure to familiarize yourself
    with each ISP's BGP Policy and how they treat routes from their BGP
    customers versus peer ISPs. Also, if you don't have your own ASN,
    you'll have to get one through ARIN. You'll also have to consider
    whether you want to load balance, which is not an exact science across
    multiple ISPs, or if you will be using one connection as a pure

    Lotsa stuff to think about if you're going to be multi-homed.
    p_teatreeoil, Mar 25, 2008
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