Can the disappearance of a connected route or the LAN port link being down trigger iBGP to perform r
I wanted to achieve fast route updates in iBGP when the LAN link goes down, but I failed. I couldn't figure out when the route updates actually happen. Additionally, I would like to know if it is feasible in my environment to have immediate route updates when the LAN link goes down.
To be precise, at what point in time does iBGP initiate the update when the LAN port (Connected Route) of Remote-LAN disappears? Based on my testing, it is evident that the routes are not updated immediately; in other words, the withdrawn message does not appear immediately.
Moreover, is the triggering of iBGP route updates by the disappearance of connected routes related to information such as "[RIB] Scanning BGP Network Routes" and "[RIB] Scanning BGP RIB"?
(BGP over VPN)(LAN)FGHG(WAN)----(VPN)---(WAN)Remote-FG(LAN)(BGP over VPN)
Here are the downtime durations I observed in the terminal device ping tests after performing a link down in Remote-FG.
downtime of ping test
○Femote-FG LAN Port Link Down
2023-06-27 15:25:17 BGP: Message type: Link Down (30)
2023-06-27 15:25:17 BGP: 126.96.36.199-Outgoing [FSM] State: Established Event: 34
2023-06-27 15:25:17 BGP: 188.8.131.52-Outgoing [ENCODE] Msg-Hdr: Type 2
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