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  • 1.  ARP on STP

    Posted 10-17-2025 04:02

    arp-on-stp

    I would like to try to learn more information about arp-on-stp .

    My first thoughts are that it seems to get along with the ip protocol. Of course we are talking about tcpip, but I have always generally thought that extra arp stuff is not always good. I have read that stp and ctf(not srx juniper) are not great with each other.

    What I want to know is if anyone has used this statement, good or bad?

    I want to know because I have entered it in the system, but I haven't committed it, because of apprehension.

    Security is a major concern.

    Sparse traffic can always be strengthened.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------


  • 2.  RE: ARP on STP

    Posted 10-17-2025 11:05

    Depending on how big your network is and how often the topology changes, you may or may not see a real-world benefit, though I don't see how it would hurt.

    See this: https://www.juniper.net/documentation/us/en/software/junos/stp-l2/topics/topic-map/spanning-tree-overview.html

    Also, since you mentioned CTF, check out this presentation: https://mentor.ieee.org/802.1/dcn/22/1-22-0045-00-ICne-ctf-forwarding-learning-and-active-topology-enforcement-in-bridges.pdf



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    Nikolay Semov
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    Original Message


  • 3.  RE: ARP on STP

    Posted 30 days ago

    Actually, arp-on-stp seems to be an obsolete feature available for old 802.1d/Old_And_Slow_spanning_tree on old EX2200/3300/4200 (non-ELS) switches, where each stp recomputation triggers slow timers and LISTEN/LEARN states, where your traffic is not flowing.

    One should just not run old stp in 2025: rstp has been the minimum way to go for 20 years (much faster, this arp-on-stp feature is not available since it would be useless).



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    Olivier Benghozi
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    Original Message


  • 4.  RE: ARP on STP

    Posted 30 days ago

    Many thx Mr. Benghozi. Also, Mr. Semov. Others welcome to comment.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------

    Original Message