Interesting: BGP Zombie Outbreak on Juniper Routers

BGP zombies are routes in the BGP table that refuse to disappear even though they should have been long gone. Recent measurements estimate between 0.5% and 1.5% of all routes in the global BGP table are zombies, which sounds crazy – after all, BGP is supposed to be pretty reliable.

Daryll Swer identified one potential source – Juniper routers do not revoke suppressed aggregated prefixes – and documented it in Navigating a BGP zombie outbreak on Juniper routers.


  1. I tried to replicate this on JunOS and couldn’t.

    It’s clearly a real thing, but I wonder what it takes to trigger and how common that is.

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