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  • 1.  EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-05-2025 19:06

    I've just put in place a 3 switch EX4600 cluster and to get it to behave they way I wanted I went with declaring the members as preprovisioned.

    virtual-chassis {
        preprovisioned;
        member 0 {
            role routing-engine;
            serial-number TC3700000000;
        }
        member 2 {
            role line-card;
            serial-number TC3700000002;
        }
        member 1 {
            role routing-engine;
            serial-number TC3700000001;
        }
    }

    Preprovisioned Virtual Chassis
    Virtual Chassis ID: 59fc.0000.0000
    Virtual Chassis Mode: Mixed
                                                    Mstr           Mixed Route Neighbor List
    Member ID  Status   Serial No    Model          prio  Role      Mode  Mode ID  Interface
    0 (FPC 0)  Prsnt    TC3700000000 ex4600-40f     129   Master*      Y  VC   2  vcp-255/0/24
                                                                               1  vcp-255/0/25
    1 (FPC 1)  Prsnt    TC3700000001 ex4600-40f     129   Backup       Y  VC   2  vcp-255/0/24
                                                                               0  vcp-255/0/25
    2 (FPC 2)  Prsnt    TC3700000002 ex4600-40f       0   Linecard     Y  VC   1  vcp-255/0/24
                                                                               0  vcp-255/0/25

    Which is all fine, except that if I unplug any of the 40G QSFPs in ports 24 or 25, the entire cluster shuts down and reboots. How do I stop that?

    At this point, I haven't added the "set no-split-detection".



  • 2.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-06-2025 03:08

    Not something we have seen before, are you on the current Junos recommended version? Also it seems you have the VC set in Mixed mode, but with only EX4600s.

    I Would raise this with JTac with the logs and they should be able to tell you why



    ------------------------------
    HARRY
    ------------------------------



  • 3.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-06-2025 03:23

    I'm running the latest version of JunOS.

    Would this help?

    set chassis no-split-detection

    (I haven't set that.) Is that applicable to a 2RE/1LC scenario?




  • 4.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-06-2025 03:30

    No-split-detection should only be required if you have only 2 devices in the VC. 



    ------------------------------
    HARRY
    ------------------------------



  • 5.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-06-2025 16:40

    Latest, but which latest one? :)



    ------------------------------
    Olivier Benghozi
    ------------------------------



  • 6.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-06-2025 18:32

    21.4R3.15




  • 7.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 01-07-2025 05:15

    The Current recommended version is 21.4R3-S8, I would recommend upgrading to that first.



    ------------------------------
    HARRY
    ------------------------------



  • 8.  RE: EX4600 cluster reboots if a VPC QSFP is disconnected

    Posted 30 days ago

    Ah. I tried to reproduce the problem again just now and failed. The problem happened too long ago (18 days) for log files to record it!