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   Erin 💽 (erincandescent@queer.af)'s status on Tuesday, 12-Dec-2023 06:46:01 JST Erin 💽

   in reply to

   I guess in a world of 120s BGP hold timers, if you keep the graceful restart timer low enough it doesn't materially affect blackholing...

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     Erin 💽 (erincandescent@queer.af)'s status on Tuesday, 12-Dec-2023 06:46:02 JST Erin 💽

     The design of BGP Graceful Restart baffles me a bunch

     Expectation: State is retained (for the grace time) if

     • Session is explicitly shutdown with a graceful restart reason, or
     • The peer establishes a new session and states it's restarting in its OPEN message (and the non-restarting router hadn't yet observed that the connection has dropped)

     Reality: State is retained if

     • You don't send a clean shutdown message

     It kinda feels designed to cause accidental packet blackholing to me...