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Forum Replies

  1. thank you for your lesson, can you explain why we use command bgp log-neighbor-changes no synchronization

  2. bgp log-neighbor-changes
    This command simply causes a message to displayed to the console or in the event log that a status has changed with one of your established BGP neighbors. This is very useful for an administrator to know.

    no synchronization
    This can be considered a legacy command now, because in modern IOS the “no synchronization” is on by default. The explanation of this is a bit long. Your best bet is to review the synchronization lesson.

    In a nutshell, the purpose for Synchronization rule was back when many internal routers didn’t have the CPU and

    ... Continue reading in our forum

  3. Hi Rene,
    I really appreciate your nice explanation. I love the way you explained the things. I have one confusion in below statement.
    "When two EBGP routers that are directly connected do not form a working BGP neighbor adjacency there could be a number of things that are wrong:

    _Layer 2 down preventing us from reaching the other side._
    _Layer 3 issue: wrong IP address on one of the routers._
    _Access-list blocking TCP port 179 (BGP)._
    _Wrong IP address configured for BGP neighbor router."

    What do you mean by layer 2 down preventing us from reaching the other si

    ... Continue reading in our forum

  4. I was reading through this and then got to the trouble section on BGP Summarization. I had never really thought about it before as I have not had to configure it in the real world though I am sure I have came across it but was no problems with it so did not take any notice.

    I studied CCNP Switch and Route and I don’t ever remember coming across summarization for BGP. I then did a DDG (DuckDuckGo my google replacement search engine) search on a line of code you had in there called aggregate-address.

    Now normally when I thought about aggregate I thought about

    ... Continue reading in our forum

  5. Hello Brian

    According to the exam topics for the CCNP ROUTE exam, BGP route summarization is not explicitly mentioned. However, it does affect individual route BGP attributes, and this is important to know. For example, when the aggregate-address command is used, the AS_PATH among other attributes, is lost.

    Ultimately, it is great to know because when you work with BGP it just add one more parameter that you can “play” with when configuring a production network. It may not be that important for certification purposes, but more for the real world usage of the

    ... Continue reading in our forum

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