SRX

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Ask questions and share experiences about the SRX Series, vSRX, and cSRX.

  • 1.  SRX1600 active/active MNHA cluster does not automatically synchronize DHCP lease tables between the nodes

    Posted 13 days ago

    Hi Community,

    We are running two Juniper SRX1600 devices in an active MNHA cluster. The MNHA link is up and the DHCP configuration is placed inside the MNHA group, so both nodes share the same settings.

    However, we are seeing that both SRX units are issuing DHCP addresses independently, resulting in duplicate IP assignments within the same subnet. It appears that although the configuration is synchronized, the DHCP lease tables are not shared between the nodes.

    Has anyone run into this before?
    Is DHCP lease synchronization supported in an active MNHA setup, or is this expected behavior?
    And what is the recommended approach to avoid duplicate DHCP addresses in this type of cluster?

    Any guidance or best practices would be appreciated.



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    JASPER POLDER
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  • 2.  RE: SRX1600 active/active MNHA cluster does not automatically synchronize DHCP lease tables between the nodes

    Posted 13 days ago

    I don't think MNHA was intended to do that. My reading of it is not as replacement for chassis cluster which would do what you need, but rather to help with session sync when routing failover occurs in larger networks and you want a more seamless experience (no session reinitialization, etc.) when traffic goes over a different path -- i.e. more like what you'd get with pure routers instead of stateful firewalls.



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    Nikolay Semov
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    Original Message


  • 3.  RE: SRX1600 active/active MNHA cluster does not automatically synchronize DHCP lease tables between the nodes

    Posted 13 days ago

    In my experience dhcp is intended to be served or more user friendly. You must find your current abilities.



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

    Original Message


  • 4.  RE: SRX1600 active/active MNHA cluster does not automatically synchronize DHCP lease tables between the nodes

    Posted 12 days ago

    with MNHA you must use DHCP relay as local DHCP leases are not sync-up across clustered devices. 



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    Shabbir Ahmed
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    Original Message


  • 5.  RE: SRX1600 active/active MNHA cluster does not automatically synchronize DHCP lease tables between the nodes

    Posted 4 days ago

    I must wonder if server properties come into play here. Honestly I don't see how they could not. Anyone know any statements to realize this?



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

    Original Message