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Route engines and commit synchronize command

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  • 1.  Route engines and commit synchronize command

    Posted 07-03-2017 20:47

    Hi everybody.

     

    Please consider the following from my book:

     

    The last option you may use with the commit command is synchronize. When you have a
    router with two Routing Engines installed, you can have the router apply the candidate configuration
    to both Routing Engines.
    [edit]
    user@router# commit synchronize
    re0: configuration check succeeds
    re1: configuration check succeeds
    re0: commit complete
    re1: commit complete
    [edit]
    user@Shiraz#
    This option is helpful in the event of a Routing Engine failure; the backup Routing Engine
    now has the latest operational parameters in the network.

     

     

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

     

    Let say we have a Juniper router with two RE; RE1, RE2

    RE1 is active . we configure OSPF on RE1, we commit the change without " synchronize". After a few days, RE1 crashes,

    Will the new RE2 have OSPF config ? If yes, why we have not used "commit synchronize" 

     

    To put it another way:

     

    Does using " only commit"  not allow RE2 to get synch with RE1's config? 

    Do we have to use " commit synch " to force R2 synch with RE1's config?

     

    Thanks and much apprecaited!!

     

     

     

     

     

     



  • 2.  RE: Route engines and commit synchronize command
    Best Answer

    Posted 07-03-2017 21:16

    Hi,

     

    Does using " only commit"  not allow RE2 to get synch with RE1's config? 

    No. Commit will not replicate the changes to the backup RE.

     

    Do we have to use " commit synch " to force R2 synch with RE1's config?

    Yes.

     

     

     

    Regards,

    Rahul

     

    Please mark my solution as accepted if it helped.



  • 3.  RE: Route engines and commit synchronize command

    Posted 07-03-2017 21:42

    Thanks Rahul.



  • 4.  RE: Route engines and commit synchronize command

     
    Posted 07-04-2017 01:46

    Hi,

     

    It is also possible to embed "commit synchronize" in system settings so that just issuing a commit will automatically synchorize the config accross REs. Recommended for dual-REs.

    https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/routing-engines-configuration-synchronizing.html

     

    Cheers,

    Ashvin