ExtremeSwitching (EXOS)

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Dual mastership is seen on X250-e stack

  • 1.  Dual mastership is seen on X250-e stack

    Posted 08-16-2018 05:29
    All of a sudden, two switches in the stack claimed to be master and caused connectivity issues to the end users. Issue resolved after I rebooted one of the switches which claimed master status.Now I am trying to understand underlying cause. I dont see any suspicious logs apart from the following one.



  • 2.  RE: Dual mastership is seen on X250-e stack

    Posted 08-16-2018 05:32
    Could you please provide a "show stacking" and "show stacking detail"


  • 3.  RE: Dual mastership is seen on X250-e stack

    Posted 08-16-2018 05:42
    sh stacking (collected before rebooting slot2)

    Stack Topology is a Ring
    Active Topology is a Ring
    Node MAC Address Slot Stack State Role Flags
    ------------------ ---- ----------- ------- ---
    *00:04:96:**:**:56 1 Active Master CA-
    00:04:96:**:**:1d 2 Active Master CA-
    00:04:96:**:**:22 3 Active Standby CA-
    00:04:96:**:**:5f 4 Active Standby CA-
    00:04:96:**:**:5c 5 Active Standby CA-

    sh stacking (Collected after the reboot. No backup is chosen. I turned off master-capability on slot2)
    Stack Topology is a Ring
    Active Topology is a Ring
    Node MAC Address Slot Stack State Role Flags
    ------------------ ---- ----------- ------- ---
    *00:04:96:**:**:56 1 Active Master CA-
    00:04:96:**:**:1d 2 Active Standby CA-
    00:04:96:**:**:22 3 Active Standby CA-
    00:04:96:**:**:5f 4 Active Standby CA-
    00:04:96:**:**:5c 5 Active Standby CA-

    sh stacking detail
    Current:
    Stacking : Enabled
    Role : Master
    Priority : Automatic
    Slot number : 1
    Stack state : Active
    Master capable? : Yes
    Stacking protocol : Standard
    License level restriction :


  • 4.  RE: Dual mastership is seen on X250-e stack

    Posted 08-16-2018 05:45
    I think no back up is chosen as there are no other master capable switches in the stack . I dont want to enable master capable on any switch before understanding underlying cause. I dont want to be in dual master-ship situation again.