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NSSU and Pre provisioned VC requirement

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  • 1.  NSSU and Pre provisioned VC requirement

    Posted 10-15-2020 21:46

    Hi everybody

    https://www.juniper.net/documentation/en_US/junos/topics/task/installation/ex-series-software-upgrading-nssu-fixed-virtual-chassis-cli.html

    As per above link:

    Preparing the Switch for Software Installation

    Before you begin software installation using NSSU:

    • Ensure that the Virtual Chassis is configured correctly to support NSSU. Verify that:

      • The Virtual Chassis members are connected in a ring topology. A ring topology prevents the Virtual Chassis from splitting during an NSSU.

      • The Virtual Chassis master and backup are adjacent to each other in the ring topology. Adjacency permits the master and backup to always be in sync, even when the switches in linecard roles are rebooting.

      • The Virtual Chassis is preprovisioned so that the linecard role has been explicitly assigned to member switches acting in the linecard role. During an NSSU, the Virtual Chassis members must maintain their roles—the master and backup must maintain their master and backup roles (although mastership will change), and the other member switches must maintain their linecard roles.

     

    ###############################################################################

    So we have three members VC as:

    set member 0 mastership-priority 255

    set member 1 mastership-priority 200

    set member 2mastership-priority 100

    We can not do NSSU because VC is not pre provisioned?

    Thanks and have a good night!!

     



  • 2.  Re: NSSU and Pre provisioned VC requirement
    Best Answer

     
    Posted 10-15-2020 22:17

     

    Hi sarahr202,

     

    Your assumption is correct, the reason why is because in step #1

     

    1. The master installs the new software image on the backup and reboots it.

    By using a pre-provisioned configuration, you will avoid that any of the line-cards replace the back-up RE, while it is rebooting.

     

     


    If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

    Regards,

    Lil Dexx
    JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB