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Adding SPC cards to cluster

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  • 1.  Adding SPC cards to cluster

    Posted 06-29-2011 08:14



    Given that in Juniper documentation that the SPC cards need to be in the same slot locations for each chassis member, is there a way to add SPC cards to the cluster without causing any service outage?  I can see adding an SPC to the secondary unit, but when the secondary gets powered on, will the cluster communicate properly so that I can fail service over to the secondary unit to complete the hardware installation?


    Thanks in advance!

  • 2.  RE: Adding SPC cards to cluster
    Best Answer

    Posted 06-30-2011 07:17

    Yep, as long as the new SPC is added to a higher-numbered slot than an existing one. The lowest-numbered slot will have one SPU acting as the CP (central point) processor, which handles session setup, internal load balancing, and stuff like that; if you add a new SPC into a lower-numbered slot of the backup, then CP on node 0 won't align with CP on node 1 and sync will fail. If the SPC is added to a higher-numbered slot, then sessions from the exisitng SPCs on node 0 will sync to their matching SPC on node 1 (with no sessions sync'ing to the new SPC), and you should be able to fail over to node 1 without any excitement at all while you add the new SPC to node 0.


  • 3.  RE: Adding SPC cards to cluster

    Posted 06-30-2011 08:49

    Thanks for the clarification!