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Forum Replies

  1. This information on how BGP neighbors establish adjacency is articulate and useful. Thank You!

    Joey

  2. Hi Rene

    Thank you for great article. I had a question though.
    Why didn’t R1 enter connect state and instead shifted to Active straight from idle? On the other hand i see R2 did enter connect state?

    thanks
    Kandhla

  3. Hei Rene,
    Thanks for the lesson, in my working experience, i am stuck in a situation for 2 sites. i have the ebgp peering up, but i am receiving 0 prefix from my isp. The isp said when they show ip bgp nei adverticed route that are hundreds of routes advertised, they can receive our route. Any good debug command to troule should this? We have plain bgp config, the same config (different peering ip though) is working with other sites.

    One interesting thing is that when i ping the isp with mtu 1500 it does not work, but it works with 1496. After reading cisco doc

    ... Continue reading in our forum

  4. Hi Jie,

    It’s possible that the MTU is causing your issue. Your ISP might be sending BGP updates of 1500 bytes which are dropped on your end. Here’s the default TCP segment size that is used for BGP:

    R1#show ip bgp neighbors 192.168.12.2 | include segment
    Maximum output segment queue size: 50
    Datagrams (max data segment is 1460 bytes):
    

    The segment size is 1460 bytes, add a TCP header (20 bytes) and IP header (20 bytes) and you have a 1500 byte packet. In other words, you should be able to send/receive up to 1500 bytes which is not possible at the moment.

    There’

    ... Continue reading in our forum

  5. OMG RENE! your FSM Diagram is so easy to understand.

    I bought this book called Routing TCP/IP, Volume II: CCIE Professional Development 2
    Great book but they have very complex descriptions on some things let me show you their chart lol… your chart below nocked it out of the ball park. don’t get me wrong that’s a great book but its hard as hex to understand and works better when paired with something like your website which can break it down in simple terms. I just had to laugh over the two diagrams though as yours was so easy to understand lol…

    https:

    ... Continue reading in our forum

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