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  • 1.  IS-IS database showing L2 database when only Level1 is enabled

    Posted 11-14-2024 23:51

    Hi everyone,

    I have been googling the reason whey Juniper shows L2 database when only L1 level is enabled:

    EX1:

    EX2:

    As can be seen above, both EX are running ISIS at Level1.

    But we look at ISIS database on either EX1 or EX2, we also see L2 database:

    Does anyone know the reason why L2 database is maintained when only Level 1 ISIS adjacency is enabled ?

    Much appreciated!!



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    Be kind!!
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  • 2.  RE: IS-IS database showing L2 database when only Level1 is enabled

    Posted 11-24-2024 05:53

    That's because you didn't turn off level 2 globally so EX1 created an LSP for itself.  Run the command "set protocols isis level 2 disable" and you will see the level 2 database empty out.  It's a good practice if you know your device will be contained entirely in Level 1.  Not only is it more efficient, but will stop accidental L2 adjacencies from forming.



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    JOHN SULLIVAN
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    Original Message


  • 3.  RE: IS-IS database showing L2 database when only Level1 is enabled

    Posted 11-24-2024 11:57
    Thanks so much John, I was hitting my head against the wall for days!!

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    Original Message